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Liu F, Bittner TD, Whitmore MC. Environmental DNA assays for Laricobius beetles (Coleoptera: Derodontidae), biocontrol agents of the hemlock woolly adelgid in North America. JOURNAL OF ECONOMIC ENTOMOLOGY 2024:toae116. [PMID: 38825579 DOI: 10.1093/jee/toae116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/29/2024] [Accepted: 05/08/2024] [Indexed: 06/04/2024]
Abstract
The hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), is an invasive pest causing significant ecological and economic damage to certain hemlock tree (Tsuga (Endlicher) Carrière, Pinales:Pinaceae) species. In response to this invasive threat, biological control strategies have been implemented, introducing natural predators such as Laricobius nigrinus Fender (Coleoptera: Derodontidae) and, more recently, Laricobius osakensis Montgomery and Shiyake (Coleoptera: Derodontidae), as specialist predators against A. tsugae. However, the genetic and morphological similarities between L. osakensis and both L. nigrinus and the native beetle, Laricobius rubidus LeConte (Coleoptera: Derodontidae), pose challenges in their identification. Effective monitoring of released predators is integral to evaluating the success of biological control measures. Environmental DNA (eDNA) holds potential for various detection applications, including species monitoring. In this study, we developed specific primers and probes targeting the mitochondrial cytochrome oxidase 1 gene sequences, achieving high specificity despite their 95% sequence similarity. With an optimal annealing temperature of 60 °C, our tools effectively differentiated L. osakensis from the other 2 beetles and demonstrated eDNA detection sensitivity down to 2 copies/µl. This research underscores the potential of precise molecular tools for advancing biological control and biodiversity assessment against invasive threats like A. tsugae.
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Affiliation(s)
- Fangzhou Liu
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
| | - Tonya D Bittner
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
| | - Mark C Whitmore
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
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2
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Crandall RS, Chandler JL, Dietschler NJ, Andersen JC, Elkinton JS. Establishment and postrelease recovery of Laricobius nigrinus and Laricobius osakensis (Coleoptera: Derodontidae), released for biological control of Adelges tsugae (Hemiptera: Adelgidae), in the Northeastern United States. ENVIRONMENTAL ENTOMOLOGY 2023; 52:769-778. [PMID: 37494455 DOI: 10.1093/ee/nvad073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 06/23/2023] [Accepted: 07/11/2023] [Indexed: 07/28/2023]
Abstract
Hemlock woolly adelgid (HWA), Adelges tsugae Annand, is a major forest pest in the eastern United States responsible for killing millions of eastern hemlock, Tsuga canadensis (L.) Carrière and Carolina hemlock, T. caroliniana Engelmann. The US biological control program for HWA has largely invested in the rearing and release of Laricobius nigrinus Fender and more recently L. osakensis Montgomery and Shiyake. Though the establishment of L. nigrinus has been well-documented in the southern, mid-Atlantic, and coastal portions of the northeastern United States, documentation in interior areas of the northeastern United States is limited. Establishment of L. osakensis in the northeastern United States has not yet been documented. Release locations in the northeastern United States were surveyed for L. nigrinus and L. osakensis establishment to examine the relationship between establishment success and winter temperatures, as winter minimum temperatures likely limit the northern range of introduced Laricobius species. Our results suggest that L. nigrinus establishment is limited by winter minimum temperatures and that the probability of establishment declines as absolute minimum temperature declines. We found L. nigrinus established at sites in Maine, New York, and Pennsylvania, but did not recover any L. nigrinus in Massachusetts, New Hampshire, or Vermont. Similarly, we found L. osakensis established at sites in New York and Pennsylvania and recovered individuals in Maine, though further sampling is necessary to confirm presence of the F3 generation. We also report the first field observation of reproduction of silver flies, Leucotaraxis argenticollis (Diptera: Chamaemyiidae), released predator of HWA, in the eastern United States.
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Affiliation(s)
- Ryan S Crandall
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA, 01003, USA
- NH Department of Natural and Cultural Resources, Concord, NH 03244, USA
| | - Jennifer L Chandler
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA, 01003, USA
- USDA Forest Service, Northern Research Station, Hamden, CT 06514, USA
| | - Nicholas J Dietschler
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
| | - Jeremy C Andersen
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA, 01003, USA
| | - Joseph S Elkinton
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA, 01003, USA
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3
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Bekins NM, Brown DR. Abundance of Songbirds in Eastern Hemlock Stands Following Chemical Treatments for Hemlock Woolly Adelgid. Northeast Nat (Steuben) 2022. [DOI: 10.1656/045.029.0112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Natalie M. Bekins
- Department of Biological Sciences, Eastern Kentucky University, Richmond, KY 40403
| | - David R. Brown
- Department of Biological Sciences, Eastern Kentucky University, Richmond, KY 40403
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Tooker JF, Pearsons KA. Newer characters, same story: neonicotinoid insecticides disrupt food webs through direct and indirect effects. CURRENT OPINION IN INSECT SCIENCE 2021; 46:50-56. [PMID: 33667691 DOI: 10.1016/j.cois.2021.02.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/17/2021] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
During the Green Revolution, older classes of insecticides contributed to biodiversity loss by decreasing insect populations and bioaccumulating across food webs. Introduction of Integrated Pest Management (IPM) improved stewardship of insecticides and promised fewer non-target effects. IPM adoption has waned in recent decades, and popularity of newer classes of insecticides, like the neonicotinoids, has surged, posing new and unique threats to insect populations. In this review, we first address how older classes of insecticides can affect trophic interactions, and then consider the influence of neonicotinoids on food webs and the role they may be playing in insect declines. We conclude by discussing challenges posed by current use patterns of neonicotinoids and how their risk can be addressed.
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Affiliation(s)
- John F Tooker
- Department of Entomology, Merkle Lab, The Pennsylvania State University, University Park, PA, USA.
| | - Kirsten A Pearsons
- Department of Entomology, Merkle Lab, The Pennsylvania State University, University Park, PA, USA
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Sweeney MR, Thompson CM, Popescu VD. Sublethal, Behavioral, and Developmental Effects of the Neonicotinoid Pesticide Imidacloprid on Larval Wood Frogs (Rana sylvatica). ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2021; 40:1840-1849. [PMID: 33760293 DOI: 10.1002/etc.5047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 11/09/2020] [Accepted: 03/18/2020] [Indexed: 06/12/2023]
Abstract
Imidacloprid, a neonicotinoid pesticide, is used to prevent the spread of the hemlock woolly adelgid, currently affecting Eastern Hemlock trees across North America. When the pesticide is sprayed directly onto soil around infested trees (soil drenching), it can run off into aquatic systems, with potential negative effects on biota. Simultaneously, climate change may lead to faster pool drying, which acts as an additional stressor for sensitive species such as amphibians. We evaluated the sublethal effects of imidacloprid (10 ppb), and interaction with shorter hydroperiods on the larval behavior, growth, and survival of a model organism, the wood frog (Rana sylvatica). We performed 3 behavioral experiments evaluating swimming speed, time spent swimming, and distance the larvae swam. We found that larvae raised in 10 ppb imidacloprid or shorter hydroperiod did not differ in their swimming time, distance, and speed from nonexposed larvae. Naïve larvae exposed for 20 min to 10- to 500-ppb concentrations also showed similar performance to nonexposed larvae. However, when we applied a stimulus halfway through each experiment, we found that larvae exposed to 10 ppb imidacloprid (short and long term) swam shorter distances and spent less time swimming, suggesting that imidacloprid exposure may slow reaction time, potentially increasing the risk of predation. To minimize impacts on pool-breeding amphibians, imidacloprid application to combat the invasive hemlock woolly adelgid should use trunk injection and avoid soil drenching. Environ Toxicol Chem 2021;40:1840-1849. © 2021 SETAC.
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Affiliation(s)
- Megan R Sweeney
- Department of Biological Sciences and Sustainability Studies Theme, Ohio University, Athens, Ohio, USA
| | - Cassandra M Thompson
- Department of Biological Sciences and Sustainability Studies Theme, Ohio University, Athens, Ohio, USA
| | - Viorel D Popescu
- Department of Biological Sciences and Sustainability Studies Theme, Ohio University, Athens, Ohio, USA
- Center for Environmental Research, University of Bucharest, Bucharest, Romania
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Frank SD, Tooker JF. Opinion: Neonicotinoids pose undocumented threats to food webs. Proc Natl Acad Sci U S A 2020; 117:22609-22613. [PMID: 32879004 PMCID: PMC7959612 DOI: 10.1073/pnas.2017221117] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- S D Frank
- Department of Entomology, North Carolina State University, Raleigh, NC 27695-7613;
| | - J F Tooker
- Department of Entomology, The Pennsylvania State University, University Park, PA 16802
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Willis Chan DS, Prosser RS, Rodríguez-Gil JL, Raine NE. Assessment of risk to hoary squash bees (Peponapis pruinosa) and other ground-nesting bees from systemic insecticides in agricultural soil. Sci Rep 2019; 9:11870. [PMID: 31413274 PMCID: PMC6694176 DOI: 10.1038/s41598-019-47805-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 07/22/2019] [Indexed: 11/15/2022] Open
Abstract
Using the hoary squash bee (Peponapis pruinosa) as a model, we provide the first probabilistic risk assessment of exposure to systemic insecticides in soil for ground-nesting bees. To assess risk in acute and chronic exposure scenarios in Cucurbita and field crops, concentrations of clothianidin, thiamethoxam and imidacloprid (neonicotinoids) and chlorantraniliprole (anthranilic diamide) in cropped soil were plotted to produce an environmental exposure distribution for each insecticide. The probability of exceedance of several exposure endpoints (LC50s) was compared to an acceptable risk threshold (5%). In Cucurbita crops, under acute exposure, risk to hoary squash bees was below 5% for honey bee LC50s for all residues evaluated but exceeded 5% for clothianidin and imidacloprid using a solitary bee LC50. For Cucurbita crops in the chronic exposure scenario, exposure risks for clothianidin and imidacloprid exceeded 5% for all endpoints, and exposure risk for chlorantraniliprole was below 5% for all endpoints. In field crops, risk to ground-nesting bees was high from clothianidin in all exposure scenarios and high for thiamethoxam and imidacloprid under chronic exposure scenarios. Risk assessments for ground-nesting bees should include exposure impacts from pesticides in soil and could use the hoary squash bee as an ecotoxicology model.
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Affiliation(s)
- D Susan Willis Chan
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Ryan S Prosser
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | | | - Nigel E Raine
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
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8
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P McCarty E, Addesso K. Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Management in Forest, Landscape, and Nursery Production. JOURNAL OF INSECT SCIENCE (ONLINE) 2019; 19:5480110. [PMID: 31222326 PMCID: PMC6483940 DOI: 10.1093/jisesa/iez031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Indexed: 06/09/2023]
Abstract
Hemlock woolly adelgid, Adelges tsugae (Annand) (Hemiptera: Adelgidae), has caused significant damage to both eastern [Tsuga canadensis (L.) Carrière] and Carolina hemlock (Tsuga caroliniana Englemann) (Pinales: Pinaceae) since it was first reported in the eastern United States. This adelgid is particularly damaging to these hemlock species due to a lack of co-evolved plant defenses and natural enemies able to suppress hemlock woolly adelgid populations. Management of hemlock woolly adelgid relies heavily on insecticides to prevent death of vulnerable trees. Biological control programs have released natural enemies of hemlock woolly adelgid to aid in control at the landscape level. Quarantine restrictions on hemlock are in place in some regions of the United States and Canada. These quarantines impact sales and shipment of hemlock trees from nurseries as well as other hemlock products. A review of insect biology, description of life stages, damage, management options, and quarantine restrictions for hemlock woolly adelgid is presented.
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Affiliation(s)
- Elizabeth P McCarty
- Warnell School of Forestry and Natural Resources, University of Georgia, Tifton, GA 31793
| | - Karla M Addesso
- Department of Agricultural and Environmental Sciences, Otis L. Floyd Nursery Research Center, Tennessee State University, McMinnville, TN 37110
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9
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Leppanen C, Frank DM, Lockyer JJ, Fellhoelter CJ, Cameron AK, Hardy BA, Smith LJ, Clevenger MR, Simberloff D. Media representation of hemlock woolly adelgid management risks: a case study of science communication and invasive species control. Biol Invasions 2018. [DOI: 10.1007/s10530-018-1850-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Hakeem A, Grant JF, Lambdin PL, Hale FA, Rhea JR, Wiggins GJ, Coots C. Influence of Imidacloprid and Horticultural Oil on Spider Abundance on Eastern Hemlock in the Southern Appalachians. ENVIRONMENTAL ENTOMOLOGY 2018; 47:951-959. [PMID: 29741606 DOI: 10.1093/ee/nvy065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Indexed: 06/08/2023]
Abstract
Hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), is an exotic pest of eastern hemlock, Tsuga canadensis (L.) Carrière (Pinales: Pinaceae), in the eastern United States. Two commonly used insecticides to manage adelgid are imidacloprid, a systemic neonicotinoid insecticide, and horticultural oil, a refined petroleum oil foliar spray. We have investigated the influence of imidacloprid and horticultural oil on spider abundance at different canopy strata in eastern hemlock. In total, 2,084 spiders representing 11 families were collected from the canopies of eastern hemlock. In beat-sheet and direct observation samples, the families Theridiidae, Araneidae, Salticidae, and Anyphaenidae were the most abundant. Significantly higher numbers of spiders were recorded on untreated control trees compared with trees treated with imidacloprid using soil drench and soil injection applications. Spider abundance in trees injected with imidacloprid and horticultural oil applications did not significantly differ from control trees. Spider abundance was significantly greater in the top and middle strata of the canopy than in the bottom stratum, where imidacloprid concentrations were the highest. Regression analysis showed that spider abundance was inversely associated with imidacloprid concentration. This research demonstrates that imidacloprid, when applied with selected methods, has the potential to result in reductions of spider densities at different strata. However, slight reductions in spider abundance may be an acceptable short-term ecological impact compared with the loss of an untreated hemlock and all the associated ecological benefits that it provides. Future studies should include investigations of long-term impact of imidacloprid on spiders associated with eastern hemlock.
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Affiliation(s)
- A Hakeem
- Texas A&M AgriLife Research and Extension Center, Lubbock, TX
| | - J F Grant
- Department of Entomology and Plant Pathology, The University of Tennessee, Knoxville, TN
| | - P L Lambdin
- Department of Entomology and Plant Pathology, The University of Tennessee, Knoxville, TN
| | - F A Hale
- Department of Entomology and Plant Pathology, Ellington Plant Sciences Center, The University of Tennessee, Nashville, TN
| | - J R Rhea
- USDA Forest Service, Forest Health Protection, Weaver Boulevard, Asheville, NC
| | - G J Wiggins
- National Institute for Mathematical and Biological Synthesis, The University of Tennessee, Volunteer Boulevard, Suite, Knoxville, TN
| | - C Coots
- Department of Entomology and Plant Pathology, The University of Tennessee, Knoxville, TN
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11
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Letheren A, Hill S, Salie J, Parkman J, Chen J. A Little Bug with a Big Bite: Impact of Hemlock Woolly Adelgid Infestations on Forest Ecosystems in the Eastern USA and Potential Control Strategies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2017; 14:ijerph14040438. [PMID: 28422072 PMCID: PMC5409639 DOI: 10.3390/ijerph14040438] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 04/15/2017] [Accepted: 04/15/2017] [Indexed: 11/16/2022]
Abstract
Hemlock woolly adelgid (Adelges tsugae Annand, HWA) remains the single greatest threat to the health and sustainability of hemlock in the eastern USA. The loss of hemlock trees leads to further negative impacts on the diversity and stability of ecosystems in the eastern part of North America. It is, therefore, urgent to develop effective control measures to reduce HWA populations and promote overall hemlock health. Currently available individual and integrated approaches should continue to be evaluated in the laboratory and in the field along with the development of other new and innovative methods.
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Affiliation(s)
- Amanda Letheren
- Department of Public Health, The University of Tennessee, Knoxville, TN 37996, USA.
| | - Stephanie Hill
- Department of Public Health, The University of Tennessee, Knoxville, TN 37996, USA.
| | - Jeanmarie Salie
- Department of Public Health, The University of Tennessee, Knoxville, TN 37996, USA.
| | - James Parkman
- Lindsay Young Beneficial Insects Laboratory, Department of Entomology and Plant Pathology, The University of Tennessee, Knoxville, TN 37996, USA.
| | - Jiangang Chen
- Department of Public Health, The University of Tennessee, Knoxville, TN 37996, USA.
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12
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Darr MN, McAvoy TJ, Brewster CC, Salom SM. Field-Cage Evaluation of Survival, Reproduction, and Feeding Behavior of Adult Scymnus coniferarum (Coleoptera: Coccinellidae), a Predator of Adelges tsugae (Hemiptera: Adelgidae). ENVIRONMENTAL ENTOMOLOGY 2016; 45:1527-1535. [PMID: 28028101 DOI: 10.1093/ee/nvw124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
The hemlock woolly adelgid, Adelges tsugae Annand, is an invasive pest of eastern (Tsuga canadensis (L.) Carrière) and Carolina hemlock (Tsuga caroliniana Engelmann) forests in the eastern United States. Scymnus (Pullus) coniferarum Crotch (Coleoptera: Coccinellidae) is a lady beetle that preys on A. tsugae in the western United States, where A. tsugae infestations on western hemlocks are not lethal. It is thought that S. coniferarum could be an important predator that helps keep A. tsugae populations from reaching damaging levels in this region. This study assesses the potential of this predator as a biological control agent for A. tsugae in the eastern United States. S. coniferarum predation, reproductive potential, and survival were evaluated in field-cages on adelgid-infested T. canadensis at two sites in southwestern Virginia. Sampling was conducted between December 2012 and June 2014 to evaluate the impact of S. coniferarum on both generations of A. tsuage (sistens and progrediens). Adult S. coniferarum fed on both generations and all life stages of A. tsugae during both field trials at rates comparable to other adelgid-specific predators. Evidence of S. coniferarum oviposition was minimal, and may be attributed to low temperatures and prey availability. S. coniferarum mortality was greatest when exposed to winter temperatures at the higher elevation site in 2013, and least throughout the 2014 spring sample period. S. coniferarum demonstrated a high predation rate on A. tsugae and survived for extended periods of time at sites in southwest Virginia, indicating that this species could be an effective predator of hemlock woolly adelgid in similar climates.
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Affiliation(s)
- M N Darr
- Department of Entomology, Virginia Tech, 170 Drillfield Drive, Blacksburg, VA 24061 (; ; ; )
| | - T J McAvoy
- Department of Entomology, Virginia Tech, 170 Drillfield Drive, Blacksburg, VA 24061 (; ; ; )
| | - C C Brewster
- Department of Entomology, Virginia Tech, 170 Drillfield Drive, Blacksburg, VA 24061 (; ; ; )
| | - S M Salom
- Department of Entomology, Virginia Tech, 170 Drillfield Drive, Blacksburg, VA 24061 (; ; ; )
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13
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Benton EP, Grant JF, Webster RJ, Cowles RS, Lagalante AF, Saxton AM, Nichols RJ, Coots CI. Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Abundance and Hemlock Canopy Health Numerous Years After Imidacloprid Basal Drench Treatments: Implications for Management Programs. JOURNAL OF ECONOMIC ENTOMOLOGY 2016; 109:2125-2136. [PMID: 27435928 DOI: 10.1093/jee/tow160] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/19/2016] [Indexed: 06/06/2023]
Abstract
Hemlock woolly adelgid (Adelges tsugae [Annand]), an invasive insect in the eastern United States, has caused widespread decline of eastern hemlock, Tsuga canadensis (L.) Carriére. Imidacloprid basal drench treatments were assessed 4-7 yr after a single treatment to determine hemlock woolly adelgid population suppression and effects on hemlock canopy health. The effects of sampling site, years post-treatment, and hemlock diameter at breast height (DBH) size classes were evaluated relative to imidacloprid treatment on hemlock woolly adelgid populations and hemlock canopy health characteristics. The influence of hemlock woolly adelgid populations on canopy health characteristics was also assessed. Imidacloprid treatments resulted in low-level hemlock woolly adelgid populations 7 yr post-treatment. Hemlock woolly adelgid was present on more hemlocks 7 yr compared with 4-6 yr post-treatment. Smaller hemlocks, dosed with 0.7 g active ingredient (AI)/2.5 cm DBH, had higher populations of hemlock woolly adelgid than the largest size class, which were treated at twice that dosage. Concentrations of imidacloprid and its olefin metabolite below the LC50 were sufficient for suppression of hemlock woolly adelgid populations, which suggests an additive effect of imidacloprid and olefin that compounds hemlock woolly adelgid mortality over many generations. Hemlock woolly adelgid populations observed in this study were too low to have an observable effect on hemlock canopy health, indicating that application intervals of up to 7 yr may be adequate to protect hemlocks.
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Affiliation(s)
- E P Benton
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Bldg., the University of Tennessee, Knoxville, TN 37996 (; ; ) University of Georgia-Tifton, 2360 Rainwater Rd., Tifton, GA 31793
| | - J F Grant
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Bldg., the University of Tennessee, Knoxville, TN 37996 (; ; )
| | - R J Webster
- Great Smoky Mountains National Park, 107 Park Headquarters Rd., Gatlinburg, TN 37738 (, )
| | - R S Cowles
- The Connecticut Agricultural Experiment Station, 153 Cook Hill Rd., Windsor, CT 06095
| | - A F Lagalante
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085-1699
| | - A M Saxton
- Department of Animal Science, the University of Tennessee, 232 Brehm Animal Science Bldg., Knoxville, TN 37996
| | - R J Nichols
- Great Smoky Mountains National Park, 107 Park Headquarters Rd., Gatlinburg, TN 37738 (, )
| | - C I Coots
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Bldg., the University of Tennessee, Knoxville, TN 37996 (; ; )
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14
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Benton EP, Grant JF, Webster RJ, Nichols RJ, Cowles RS, Lagalante AF, Coots CI. Assessment of Imidacloprid and Its Metabolites in Foliage of Eastern Hemlock Multiple Years Following Treatment for Hemlock Woolly Adelgid, Adelges tsugae (Hemiptera: Adelgidae), in Forested Conditions. JOURNAL OF ECONOMIC ENTOMOLOGY 2015; 108:2672-82. [PMID: 26470386 DOI: 10.1093/jee/tov241] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 07/19/2015] [Indexed: 05/04/2023]
Abstract
Widespread decline and mortality of eastern hemlock, Tsuga canadensis (L.) Carrière, have been caused by hemlock woolly adelgid, Adelges tsugae (Annand) (HWA) (Hemiptera: Adelgidae). The current study is a retrospective analysis conducted in collaboration with Great Smoky Mountains National Park (GRSM) to determine longevity of imidacloprid and its insecticidal metabolites (imidacloprid olefin, 5-hydroxy, and dihydroxy) in GRSM's HWA integrated pest management (IPM) program. Foliage samples were collected from three canopy strata of hemlocks that were given imidacloprid basal drench treatments 4-7 yr prior to sampling. Foliage was analyzed to assess concentrations in parts per billion (ppb) of imidacloprid and its metabolites. Imidacloprid and its olefin metabolite were present in most, 95 and 65%, respectively, branchlets 4-7 yr post-treatment, but the 5-hydroxy and dihydroxy metabolites were present in only 1.3 and 11.7%, respectively, of the branchlets. Imidacloprid and olefin concentrations significantly decreased between 4 and 7 yr post-treatment. Concentrations of both imidacloprid and olefin were below the LC50 for HWA 5-7 yr post-treatment. Knowledge of the longevity of imidacloprid treatments and its metabolite olefin can help maximize the use of imidacloprid in HWA IPM programs.
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Affiliation(s)
- E P Benton
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Building, The University of Tennessee, Knoxville, TN 37996.
| | - J F Grant
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Building, The University of Tennessee, Knoxville, TN 37996
| | - R J Webster
- Great Smoky Mountains National Park, 107 Park Headquarters Rd., Gatlinburg, TN 37738
| | - R J Nichols
- Great Smoky Mountains National Park, 107 Park Headquarters Rd., Gatlinburg, TN 37738
| | - R S Cowles
- The Connecticut Agricultural Experiment Station, 153 Cook Hill Rd., Windsor, CT 06095
| | - A F Lagalante
- Department of Chemistry, 800 Lancaster Ave., Villanova University, Villanova, PA 19085-1699
| | - C I Coots
- Department of Entomology and Plant Pathology, 370 Plant Biotechnology Building, The University of Tennessee, Knoxville, TN 37996
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Kung WY, Hoover K, Cowles R, Talbot Trotter R. Long-Term Effects of Imidacloprid on Eastern Hemlock Canopy Arthropod Biodiversity in New England. Northeast Nat (Steuben) 2015. [DOI: 10.1656/045.022.0120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Pisa LW, Amaral-Rogers V, Belzunces LP, Bonmatin JM, Downs CA, Goulson D, Kreutzweiser DP, Krupke C, Liess M, McField M, Morrissey CA, Noome DA, Settele J, Simon-Delso N, Stark JD, Van der Sluijs JP, Van Dyck H, Wiemers M. Effects of neonicotinoids and fipronil on non-target invertebrates. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:68-102. [PMID: 25223353 PMCID: PMC4284392 DOI: 10.1007/s11356-014-3471-x] [Citation(s) in RCA: 492] [Impact Index Per Article: 54.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 08/15/2014] [Indexed: 05/17/2023]
Abstract
We assessed the state of knowledge regarding the effects of large-scale pollution with neonicotinoid insecticides and fipronil on non-target invertebrate species of terrestrial, freshwater and marine environments. A large section of the assessment is dedicated to the state of knowledge on sublethal effects on honeybees (Apis mellifera) because this important pollinator is the most studied non-target invertebrate species. Lepidoptera (butterflies and moths), Lumbricidae (earthworms), Apoidae sensu lato (bumblebees, solitary bees) and the section "other invertebrates" review available studies on the other terrestrial species. The sections on freshwater and marine species are rather short as little is known so far about the impact of neonicotinoid insecticides and fipronil on the diverse invertebrate fauna of these widely exposed habitats. For terrestrial and aquatic invertebrate species, the known effects of neonicotinoid pesticides and fipronil are described ranging from organismal toxicology and behavioural effects to population-level effects. For earthworms, freshwater and marine species, the relation of findings to regulatory risk assessment is described. Neonicotinoid insecticides exhibit very high toxicity to a wide range of invertebrates, particularly insects, and field-realistic exposure is likely to result in both lethal and a broad range of important sublethal impacts. There is a major knowledge gap regarding impacts on the grand majority of invertebrates, many of which perform essential roles enabling healthy ecosystem functioning. The data on the few non-target species on which field tests have been performed are limited by major flaws in the outdated test protocols. Despite large knowledge gaps and uncertainties, enough knowledge exists to conclude that existing levels of pollution with neonicotinoids and fipronil resulting from presently authorized uses frequently exceed the lowest observed adverse effect concentrations and are thus likely to have large-scale and wide ranging negative biological and ecological impacts on a wide range of non-target invertebrates in terrestrial, aquatic, marine and benthic habitats.
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Affiliation(s)
- L W Pisa
- Environmental Sciences, Copernicus Institute, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, The Netherlands,
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17
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Concentration Levels of Imidacloprid and Dinotefuran in Five Tissue Types of Black Walnut, Juglans nigra. FORESTS 2013. [DOI: 10.3390/f4040887] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Diversity, Vertical Stratification and Co-Occurrence Patterns of the Mycetophilid Community among Eastern Hemlock, Tsuga canadensis (L.) Carrière, in the Southern Appalachians. FORESTS 2012. [DOI: 10.3390/f3040986] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Grubin SM, Ross DW, Wallin KF. Prey suitability and phenology of Leucopis spp. (Diptera: Chamaemyiidae) associated with hemlock woolly adelgid (Hemiptera: Adelgidae) in the Pacific Northwest. ENVIRONMENTAL ENTOMOLOGY 2011; 40:1410-1416. [PMID: 22217756 DOI: 10.1603/en11127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Leucopis spp. (Diptera: Chamaemyiidae) from the Pacific Northwest previously were identified as potential biological control agents for the hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), in the eastern United States. We collected Leucopis spp. larvae from A. tsugae infested western hemlocks in Oregon and Washington and reared them on an unidentified Pineus spp., Pineus strobi (Hartig), Adelges cooleyi (Gillette), Adelges piceae (Ratzeburg), and A. tsugae in three no-choice tests. Leucopis spp. survival on A. tsugae was significantly higher than on A. piceae during the 2010 progrediens generation test and significantly higher than on P. strobi and A. cooleyi during the 2010 sistens generation test. However, across all three tests, some larvae completed development to adult on all four of the alternative adelgid species. Larvae that survived to the adult stage were identified as Leucopis argenticollis Zetterstedt and Leucopis piniperda Malloch. These results suggest that populations of L. argenticollis and L. piniperda in the Pacific Northwest may not be specific to A. tsugae. We also studied the phenology of Leucopis spp. on fourteen A. tsugae infested western hemlock trees in Oregon and Washington over a period of 14 mo. Leucopis spp. larvae were collected year-round, but highest densities coincided with the presence of progrediens and sistens eggs and adults of A. tsugae. There was a positive correlation between Leucopis spp. and A. tsugae abundance.
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Affiliation(s)
- Sarah M Grubin
- Department of Forest Ecosystems and Society, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331-5752, USA
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