1
|
Yang LF, Liu YG, Tao YL, Zhang WM, Li JY, Chi SQ, Zhang GF, Chu D. Development of an on-site diagnostic LAMP assay for rapid differentiation of the invasive pest Phthorimaea absoluta (Meyrick) using insect tissues. PEST MANAGEMENT SCIENCE 2024; 80:4069-4073. [PMID: 38563512 DOI: 10.1002/ps.8114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 03/26/2024] [Accepted: 04/02/2024] [Indexed: 04/04/2024]
Abstract
BACKGROUND The tomato leafminer, Phthorimaea absoluta (Meyrick) (Lepidoptera: Gelechiidae), is a destructive invasive pest that originated in South America and has spread within China since 2017. A rapid method for on-site identification of P. absoluta is urgently needed for interception of this pest across China. RESULTS We developed a loop-mediated isothermal amplification (LAMP) technique to differentiate P. absoluta from Liriomyza sativae, Chromatomyia horticola, and Phthorimaea operculella using extracted genomic DNA, which was then refined to create an on-site LAMP diagnostic method that can be performed under field conditions without the need for laboratory equipment. CONCLUSION In the present research, we developed an on-site diagnostic method for rapid differentiation of P. absoluta from other insects with similar morphology or damage characteristics in China. © 2024 Society of Chemical Industry.
Collapse
Affiliation(s)
- Li-Feng Yang
- Shandong Engineering Research Center for Environment-friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
- Shandong Province Center for Bioinvasions and Eco-security, Qingdao Agricultural University, Qingdao, China
| | - Ya-Ge Liu
- Shandong Engineering Research Center for Environment-friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
- Shandong Province Center for Bioinvasions and Eco-security, Qingdao Agricultural University, Qingdao, China
| | - Yun-Li Tao
- Shandong Engineering Research Center for Environment-friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
- Shandong Province Center for Bioinvasions and Eco-security, Qingdao Agricultural University, Qingdao, China
| | - Wan-Min Zhang
- Department of Pest Prediction and Management, Liaoning Technological Center of Green Agriculture, Shenyang, China
| | - Jian-Yong Li
- Tech Center of Jinan Customs District, Jinan, China
| | - Sheng-Qi Chi
- Shandong Engineering Research Center for Environment-friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
- Shandong Province Center for Bioinvasions and Eco-security, Qingdao Agricultural University, Qingdao, China
| | - Gui-Fen Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Key Laboratory of Integrated Pest Management of Crop, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dong Chu
- Shandong Engineering Research Center for Environment-friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
- Shandong Province Center for Bioinvasions and Eco-security, Qingdao Agricultural University, Qingdao, China
| |
Collapse
|
2
|
Shashank PR, Parker BM, Rananaware SR, Plotkin D, Couch C, Yang LG, Nguyen LT, Prasannakumar NR, Braswell WE, Jain PK, Kawahara AY. CRISPR-based diagnostics detects invasive insect pests. Mol Ecol Resour 2024; 24:e13881. [PMID: 37888995 PMCID: PMC10842307 DOI: 10.1111/1755-0998.13881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/24/2023] [Accepted: 09/28/2023] [Indexed: 10/28/2023]
Abstract
Rapid identification of organisms is essential for many biological and medical disciplines, from understanding basic ecosystem processes, disease diagnosis, to the detection of invasive pests. CRISPR-based diagnostics offers a novel and rapid alternative to other identification methods and can revolutionize our ability to detect organisms with high accuracy. Here we describe a CRISPR-based diagnostic developed with the universal cytochrome-oxidase 1 gene (CO1). The CO1 gene is the most sequenced gene among Animalia, and therefore our approach can be adopted to detect nearly any animal. We tested the approach on three difficult-to-identify moth species (Keiferia lycopersicella, Phthorimaea absoluta and Scrobipalpa atriplicella) that are major invasive pests globally. We designed an assay that combines recombinase polymerase amplification (RPA) with CRISPR for signal generation. Our approach has a much higher sensitivity than real-time PCR assays and achieved 100% accuracy for identification of all three species, with a detection limit of up to 120 fM for P. absoluta and 400 fM for the other two species. Our approach does not require a sophisticated laboratory, reduces the risk of cross-contamination, and can be completed in less than 1 h. This work serves as a proof of concept that has the potential to revolutionize animal detection and monitoring.
Collapse
Affiliation(s)
- Pathour R Shashank
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
- Division of Entomology, ICAR-Indian Agricultural Research Institution, New Delhi, India
| | - Brandon M Parker
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, USA
- Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - Santosh R Rananaware
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - David Plotkin
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
| | - Christian Couch
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
| | - Lilia G Yang
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Long T Nguyen
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - N R Prasannakumar
- Division of Crop Protection, ICAR-Indian Institute of Horticultural Research, Bengaluru, India
| | - W Evan Braswell
- Insect Management and Molecular Diagnostics Laboratory, USDA APHIS PPQ S&T, Edinburg, Texas, USA
| | - Piyush K Jain
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
- UF Health Cancer Center, University of Florida, Gainesville, Florida, USA
| | - Akito Y Kawahara
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
| |
Collapse
|
3
|
Zink FA, Tembrock LR, Timm AE, Gilligan TM. Ultra-deep sequencing of 45S rDNA to discern intragenomic diversity in three Chrysodeixis species for molecular identification. Sci Rep 2023; 13:13017. [PMID: 37563256 PMCID: PMC10415407 DOI: 10.1038/s41598-023-39673-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 07/28/2023] [Indexed: 08/12/2023] Open
Abstract
Species identification is necessary to prevent introductions of exotic plant pests through global trade. Many of these pests are understudied and lack publicly available DNA sequence data on which rapid molecular identification methods can be based. One such lineage is the genus Chrysodeixis, which includes three species of potential concern for United States trade initiatives: C. includens, C. chalcites, and C. eriosoma. Here we describe a method to generate robust 45S rDNA profiles using long read sequencing in order to clarify evolutionary relationships and develop a real-time PCR identification technique. Such an identification tool will be useful in rapidly differentiating between Chrysodeixis species of quarantine concern where traditional morphological identification methods are insufficient. Molecular methods such as this greatly reduce the time spent identifying each specimen, allow for detection of eDNA, vastly increase throughput, and increase the probability of detection. The methods presented here will be generally adaptable to any understudied lepidopteran taxa that necessitates a molecular diagnostic assay and, with adjustment or testing of the primers, could be applied to any group for which development of rDNA profiles in a benchtop setting would prove useful.
Collapse
Affiliation(s)
- Frida A Zink
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
| | - Luke R Tembrock
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA.
| | - Alicia E Timm
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
| | - Todd M Gilligan
- Pest Identification Technology Laboratory, USDA-APHIS-PPQ-Science and Technology, Fort Collins, CO, USA
| |
Collapse
|
4
|
Janssen D, González-Miras E, Rodríguez E. Tuta absoluta-Specific DNA in Domestic and Synanthropic Vertebrate Insectivore Feces. INSECTS 2023; 14:673. [PMID: 37623383 PMCID: PMC10456033 DOI: 10.3390/insects14080673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 08/26/2023]
Abstract
The ecology of greenhouse pests generally involves parasitoid or predatory insects. However, we investigated whether the leaf miner Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) is part of the diet of domestic and synanthropic vertebrate animals, such as birds, reptiles, and mammals, and that take part in an ecosystem that contains a high density of tomato greenhouses. Feces from domesticated partridges, common quails, and chickens, as well as from wild lizards were collected within tomato greenhouses, and fecal pellets from bats, swallows, common swifts, and house martins living in the vicinity of tomato greenhouses were collected outside. The efficiencies of three different DNA extraction methods were compared on bird, reptile, and mammal stool samples, and the DNA extracts were analyzed using probe real-time PCR for the presence of T. absoluta DNA. The results showed that bats fed on the pest, which was also part of the diet of several bird species: partridges and common quails kept within tomato greenhouses and swallows and common swifts living outside but in the vicinity of tomato greenhouses. In addition, fecal samples of three lizard species living near tomato crops also tested positive for T. absoluta DNA. The results suggest that aerial foraging bats and insectivorous birds are part of ecosystems that involve leaf miners and tomato greenhouses.
Collapse
Affiliation(s)
- Dirk Janssen
- Department of Sustainable Crop Protection, Andalusian Institute of Agricultural and Fisheries Research and Training (IFAPA), Paraje San Nicolás, Autovía del Mediterráneo, Exit 420, E-04745 La Mojonera, Almeria, Spain;
| | - Emilio González-Miras
- SERBAL (Sociedad para Estudio y la Recuperación de la Biodiversidad Almeriense), E-04720 Almeria, Spain;
| | - Estefanía Rodríguez
- Department of Sustainable Crop Protection, Andalusian Institute of Agricultural and Fisheries Research and Training (IFAPA), Paraje San Nicolás, Autovía del Mediterráneo, Exit 420, E-04745 La Mojonera, Almeria, Spain;
| |
Collapse
|
5
|
Shashank PR, Parker BM, Rananaware SR, Plotkin D, Couch C, Yang LG, Nguyen LT, Prasannakumar NR, Braswell WE, Jain PK, Kawahara AY. CRISPR-based diagnostics detects invasive insect pests. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.16.541004. [PMID: 37292907 PMCID: PMC10245733 DOI: 10.1101/2023.05.16.541004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Rapid identification of organisms is essential across many biological and medical disciplines, from understanding basic ecosystem processes and how organisms respond to environmental change, to disease diagnosis and detection of invasive pests. CRISPR-based diagnostics offers a novel and rapid alternative to other identification methods and can revolutionize our ability to detect organisms with high accuracy. Here we describe a CRISPR-based diagnostic developed with the universal cytochrome-oxidase 1 gene (CO1). The CO1 gene is the most sequenced gene among Animalia, and therefore our approach can be adopted to detect nearly any animal. We tested the approach on three difficult-to-identify moth species (Keiferia lycopersicella, Phthorimaea absoluta, and Scrobipalpa atriplicella) that are major invasive pests globally. We designed an assay that combines recombinase polymerase amplification (RPA) with CRISPR for signal generation. Our approach has a much higher sensitivity than other real time-PCR assays and achieved 100% accuracy for identification of all three species, with a detection limit of up to 120 fM for P. absoluta and 400 fM for the other two species. Our approach does not require a lab setting, reduces the risk of cross-contamination, and can be completed in less than one hour. This work serves as a proof of concept that has the potential to revolutionize animal detection and monitoring.
Collapse
Affiliation(s)
- Pathour R. Shashank
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
- Division of Entomology, ICAR-Indian Agricultural Research Institution, New Delhi 110012, India
| | - Brandon M. Parker
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
- Oak Ridge Institute for Science and Education, Oak Ridge, TN 37831, USA
- U.S. Environmental Protection Agency, Office of Research and Development, RTP, NC, 27709, USA
| | - Santosh R. Rananaware
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - David Plotkin
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
| | - Christian Couch
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
| | - Lilia G. Yang
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Long T. Nguyen
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - N. R. Prasannakumar
- Division of Crop Protection, ICAR-Indian Institute of Horticultural Research, Bengaluru 560089, India
| | - W. Evan Braswell
- Insect Management and Molecular Diagnostics Laboratory, USDA APHIS PPQ S&T, 22675 North Moorefield Road, Edinburg, Texas 78541, USA
| | - Piyush K. Jain
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
- UF Health Cancer Center, University of Florida, Gainesville, Florida, USA
| | - Akito Y. Kawahara
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
| |
Collapse
|
6
|
Lewald KM, Song W, Eweis-LaBolle D, Truong C, Godfrey KE, Chiu JC. Probe-based quantitative PCR and RPA-Cas12a molecular diagnostics for detection of the tomato pest Phthorimaea absoluta (Lepidoptera: Gelechiidae). JOURNAL OF ECONOMIC ENTOMOLOGY 2023:7161379. [PMID: 37177893 DOI: 10.1093/jee/toad079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 03/14/2023] [Accepted: 04/22/2023] [Indexed: 05/15/2023]
Abstract
The tomato pest Phthorimaea absoluta Meyrick is highly invasive but has not yet invaded North America. However, several morphologically similar species are already present, making detection of P. absoluta presence and invasion challenging. We designed a quantitative PCR molecular diagnostic to differentiate P. absoluta, P. operculella (Zeller), or Keiferia lycopersicella (Walsingham) (Lepidoptera: Gelechiidae) DNA. Additionally, we developed an RPA-Cas12a molecular diagnostic that allows for the isothermal detection of P. absoluta DNA, eliminating the need for a thermocycler. The results of the RPA-Cas12a diagnostic can be visualized simply using a UV light source and cell phone camera. We expect these diagnostics to improve quarantine and prevention measures against this serious agricultural threat.
Collapse
Affiliation(s)
- Kyle M Lewald
- Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, One Shields Ave, Davis, CA 95616, USA
| | - Wenqi Song
- Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, One Shields Ave, Davis, CA 95616, USA
| | - Daniel Eweis-LaBolle
- Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, One Shields Ave, Davis, CA 95616, USA
| | - Cindy Truong
- Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, One Shields Ave, Davis, CA 95616, USA
| | - Kristine E Godfrey
- Contained Research Facility, University of California, Davis, 555 Hopkins Rd, Davis, CA 95616, USA
| | - Joanna C Chiu
- Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, One Shields Ave, Davis, CA 95616, USA
| |
Collapse
|
7
|
Tembrock LR, Wilson CR, Zink FA, Timm AE, Gilligan TM, Konstantinov AS, Tishechkin AK. CO1 barcodes resolve an asymmetric biphyletic clade for Diabrotica undecimpunctata subspecies and provide nucleotide variants for differentiation from related lineages using real-time PCR. FRONTIERS IN INSECT SCIENCE 2023; 3:1168586. [PMID: 38469542 PMCID: PMC10926502 DOI: 10.3389/finsc.2023.1168586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 03/28/2023] [Indexed: 03/13/2024]
Abstract
Diabrotica undecimpunctata is a multivoltine polyphagous beetle species that has long been documented as a significant agricultural pest throughout its native range in North America. This beetle can vector bacterial and viral plant pathogens that result in major losses to crops such as cucumber and soybean. Many countries outside the Americas treat D. undecimpunctata as a species of quarantine importance, while in the USA only the subspecies D. u. duodecimnotata is subject to quarantine, to prevent introduction from Mexico. Identification of D. undecimpunctata on the basis of morphology alone can be complicated given the use of conflicting characters in the description of some subspecific taxa. To better understand relationships among D. undecimpunctata subspecies and other related species, we sequenced mitochondrial cytochrome oxidase 1 (CO1) and nuclear internal transcribed spacer 2 (ITS2) DNA from individuals in different subspecific taxa and across different parts of the species range using museum samples and interceptions. When our data were combined with publicly available Diabrotica data, no pattern of divergence consistent with the currently recognized subspecific designations was found. In addition, we compared phylogenetic patterns in CO1 data from the congener D. virgifera to demonstrate the utility of mitochondrial data in resolving subspecies. From the CO1 data, a diagnostic real-time PCR assay was developed that could successfully identify all haplotypes within the large D. undecimpunctata clade for use in surveys and identification at ports of entry. These findings underscore the need to resolve molecular and morphological datasets into cogent, lineage-based groupings. Such efforts will provide an evolutionary context for the study of agriculturally important attributes of Diabrotica such as host preferences, xenobiotic metabolism, and natural and anthropogenic patterns of dispersal.
Collapse
Affiliation(s)
- Luke R. Tembrock
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, United States
| | - Christina R. Wilson
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, United States
| | - Frida A. Zink
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, United States
| | - Alicia E. Timm
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, United States
| | - Todd M. Gilligan
- Pest Identification Technology Laboratory, USDA-APHIS-PPQ-Science and Technology, Fort Collins, CO, United States
| | | | - Alexey K. Tishechkin
- Plant Pest Diagnostics Branch, California Department of Food and Agriculture, Sacramento, CA, United States
| |
Collapse
|
8
|
Zink FA, Tembrock LR, Timm AE, Gilligan TM. A Droplet Digital PCR (ddPCR) Assay to Detect Phthorimaea absoluta (Lepidoptera: Gelechiidae) in Bulk Trap Samples. JOURNAL OF ECONOMIC ENTOMOLOGY 2022; 115:2125-2129. [PMID: 36354050 DOI: 10.1093/jee/toac177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Indexed: 06/16/2023]
Abstract
The moth species Phthorimaea absoluta (Meyrick) (formerly Tuta absoluta) is serious threat to tomato and other Solanaceous crops worldwide and is invasive throughout Europe, Asia, and Africa. While P. absoluta has not yet been found in the U.S. recent detections in the Caribbean have raised concerns that the species could be introduced to mainland North America. To improve detection capacity, a droplet digital PCR (ddPCR) assay was developed that employs a nondestructive bulk DNA extraction method able to detect one P. absoluta sample among 200 nontargets. Such high-throughput and sensitive molecular assays are essential to preventing introductions through early detection and response. This assay can also be used in areas where P. absoluta is established to monitor outbreaks and track migratory patterns.
Collapse
Affiliation(s)
- Frida A Zink
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Luke R Tembrock
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Alicia E Timm
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Todd M Gilligan
- USDA-APHIS-PPQ-Science & Technology, Pest Identification Technology Laboratory, Fort Collins, CO 80526, USA
| |
Collapse
|
9
|
Butterwort V, Dansby H, Zink FA, Tembrock LR, Gilligan TM, Godoy A, Braswell WE, Kawahara AY. A DNA Extraction Method for Insects From Sticky Traps: Targeting a Low Abundance Pest, Phthorimaea absoluta (Lepidoptera: Gelechiidae), in Mixed Species Communities. JOURNAL OF ECONOMIC ENTOMOLOGY 2022; 115:844-851. [PMID: 35391487 DOI: 10.1093/jee/toac046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Indexed: 06/14/2023]
Abstract
Invasive insects can cause catastrophic damage to ecosystems and cost billions of dollars each year due to management expenses and lost revenue. Rapid detection is an important step to prevent invasive insects from spreading, but improvements in detection capabilities are needed for bulk collections like those from sticky traps. Here we present a bulk DNA extraction method designed for the detection of Phthorimaea absoluta Meyrick (Lepidoptera: Gelechiidae), an invasive moth that can decimate tomato crops. We test the extraction method for insect specimens on sticky traps, subjected to different temperature and humidity conditions, and among mock insect communities left in the field for up to 21 d. We find that the extraction method yielded high success (>92%) in recovering target DNA across field and lab trials, without a decline in recovery after three weeks, across all treatments. These results may have a large impact on tomato growing regions where P. absoluta is in the early stages of invasion or not yet present. The extraction method can also be used to improve detection capabilities for other bulk insect collections, especially those using sticky traps, to the benefit of pest surveys and biodiversity studies.
Collapse
Affiliation(s)
- V Butterwort
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32511, USA
| | - H Dansby
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32511, USA
| | - F A Zink
- Department of Agricultural Biology, 1177 Campus Delivery, Colorado State University, Fort Collins, CO 80523, USA
| | - L R Tembrock
- Department of Agricultural Biology, 1177 Campus Delivery, Colorado State University, Fort Collins, CO 80523, USA
| | - T M Gilligan
- USDA-APHIS-PPQ-Science & Technology, Identification Technology Program, 2301 Research Boulevard, Suite 108, Fort Collins, CO 80526, USA
| | - A Godoy
- USDA-APHIS-PPQ-Science & Technology, Insect Management and Molecular Diagnostics Laboratory, 22675 N. Moorfield Road, Building 6414, Edinburg, TX 78541, USA
| | - W E Braswell
- USDA-APHIS-PPQ-Science & Technology, Insect Management and Molecular Diagnostics Laboratory, 22675 N. Moorfield Road, Building 6414, Edinburg, TX 78541, USA
| | - A Y Kawahara
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL 32511, USA
| |
Collapse
|