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Gassmann AJ, Reisig DD. Management of Insect Pests with Bt Crops in the United States. ANNUAL REVIEW OF ENTOMOLOGY 2023; 68:31-49. [PMID: 36170641 DOI: 10.1146/annurev-ento-120220-105502] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Genetically engineered corn and cotton that produce insecticidal toxins derived from the bacterium Bacillus thuringiensis (Bt) have been used to manage insect pests in the United States and elsewhere. In some cases, this has led to regional suppression of pest populations and pest eradication within the United States, and these outcomes were associated with reductions in conventional insecticides and increased profits for farmers. In other instances, pests evolved resistance to multiple Bt traits, compromising the capacity of Bt crops to manage pests and leading to increased feeding injury to crops in the field. Several aspects of pest biology and pest-crop interactions were associated with cases where pests remained susceptible versus instances where pests evolved resistance. The viability of future transgenic traits can be improved by learning from these past outcomes. In particular, efforts should be made to delay resistance by increasing the prevalence of refuges and using integrated pest management.
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Affiliation(s)
- Aaron J Gassmann
- Department of Plant Pathology, Entomology and Microbiology, Iowa State University, Ames, Iowa, USA;
| | - Dominic D Reisig
- Department of Entomology and Plant Pathology, North Carolina State University, Plymouth, North Carolina, USA
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2
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Chromobacterium Csp_P biopesticide is toxic to larvae of three Diabrotica species including strains resistant to Bacillus thuringiensis. Sci Rep 2022; 12:17858. [PMID: 36284199 PMCID: PMC9596699 DOI: 10.1038/s41598-022-22229-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/11/2022] [Indexed: 01/20/2023] Open
Abstract
The development of new biopesticides to control the western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, is urgent due to resistance evolution to various control methods. We tested an air-dried non-live preparation of Chromobacterium species Panama (Csp_P), against multiple corn rootworm species, including Bt-resistant and -susceptible WCR strains, northern (NCR, D. barberi Smith & Lawrence), and southern corn rootworm (SCR, D. undecimpunctata howardi Barber), in diet toxicity assays. Our results documented that Csp_P was toxic to all three corn rootworms species based on lethal (LC50), effective (EC50), and molt inhibition concentration (MIC50). In general, toxicity of Csp_P was similar among all WCR strains and ~ 3-fold less toxic to NCR and SCR strains. Effective concentration (EC50) was also similar among WCR and SCR strains, and 5-7-fold higher in NCR strains. Molt inhibition (MIC50) was similar among all corn rootworm strains except NCR diapause strain that was 2.5-6-fold higher when compared to all other strains. There was no apparent cross-resistance between Csp_P and any of the currently available Bt proteins. Our results indicate that Csp_P formulation was effective at killing multiple corn rootworm strains including Bt-resistant WCR and could be developed as a potential new management tool for WCR control.
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Wang C, Bean GJ, Chen CJ, Kessenich CR, Peng J, Visconti NR, Milligan JS, Moore RG, Tan J, Edrington TC, Li B, Giddings KS, Bowen D, Luo J, Ciche T, Moar WJ. Safety assessment of Mpp75Aa1.1, a new ETX_MTX2 protein from Brevibacillus laterosporus that controls western corn rootworm. PLoS One 2022; 17:e0274204. [PMID: 36074780 PMCID: PMC9455866 DOI: 10.1371/journal.pone.0274204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 08/23/2022] [Indexed: 11/24/2022] Open
Abstract
The recently discovered insecticidal protein Mpp75Aa1.1 from Brevibacillus laterosporus is a member of the ETX_MTX family of beta-pore forming proteins (β-PFPs) expressed in genetically modified (GM) maize to control western corn rootworm (WCR; Diabrotica virgifera virgifera LeConte). In this manuscript, bioinformatic analysis establishes that although Mpp75Aa1.1 shares varying degrees of similarity to members of the ETX_MTX2 protein family, it is unlikely to have any allergenic, toxic, or otherwise adverse biological effects. The safety of Mpp75Aa1.1 is further supported by a weight of evidence approach including evaluation of the history of safe use (HOSU) of ETX_MTX2 proteins and Breviballus laterosporus. Comparisons between purified Mpp75Aa1.1 protein and a poly-histidine-tagged (His-tagged) variant of the Mpp75Aa1.1 protein demonstrate that both forms of the protein are heat labile at temperatures at or above 55°C, degraded by gastrointestinal proteases within 0.5 min, and have no adverse effects in acute mouse oral toxicity studies at a dose level of 1920 or 2120 mg/kg body weight. These results support the use of His-tagged proteins as suitable surrogates for assessing the safety of their non-tagged parent proteins. Taken together, we report that Mpp75Aa1.1 is the first ETX-MTX2 insecticidal protein from B. laterosporus and displays a similar safety profile as typical Cry proteins from Bacillus thuringiensis.
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Affiliation(s)
- Cunxi Wang
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Gregory J. Bean
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Chun Ju Chen
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | | | - Jiexin Peng
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | | | - Jason S. Milligan
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Robert G. Moore
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jianguo Tan
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | | | - Bin Li
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Kara S. Giddings
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - David Bowen
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jinhua Luo
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Todd Ciche
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - William J. Moar
- Bayer Crop Science, Chesterfield, Missouri, United States of America
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Babar TK, Glare TR, Hampton JG, Hurst MRH, Narciso JO. Isolation, Purification, and Characterisation of a Phage Tail-Like Bacteriocin from the Insect Pathogenic Bacterium Brevibacillus laterosporus. Biomolecules 2022; 12:1154. [PMID: 36009048 PMCID: PMC9406221 DOI: 10.3390/biom12081154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/13/2022] [Accepted: 08/16/2022] [Indexed: 11/23/2022] Open
Abstract
The Gram-positive and spore-forming bacterium Brevibacillus laterosporus (Bl) belongs to the Brevibacillus brevis phylogenetic cluster. Isolates of the species have demonstrated pesticidal potency against a wide range of invertebrate pests and plant diseases. Two New Zealand isolates, Bl 1821L and Bl 1951, are under development as biopesticides for control of diamondback moth and other pests. However, due to the often-restricted growth of these endemic isolates, production can be an issue. Based on the previous work, it was hypothesised that the putative phages might be involved. During investigations of the cause of the disrupted growth, electron micrographs of crude lysate of Bl 1821L showed the presence of phages’ tail-like structures. A soft agar overlay method with PEG 8000 precipitation was used to differentiate between the antagonistic activity of the putative phage and phage tail-like structures (bacteriocins). Assay tests authenticated the absence of putative phage activity. Using the same method, broad-spectrum antibacterial activity of Bl 1821L lysate against several Gram-positive bacteria was found. SDS-PAGE of sucrose density gradient purified and 10 kD MWCO concentrated lysate showed a prominent protein band of ~48 kD, and transmission electron microscopy revealed the presence of polysheath-like structures. N-terminal sequencing of the ~48 kD protein mapped to a gene with weak predicted amino acid homology to a Bacillus PBSX phage-like element xkdK, the translated product of which shared >90% amino acid similarity to the phage tail-sheath protein of another Bl published genome, LMG15441. Bioinformatic analysis also identified an xkdK homolog in the Bl 1951 genome. However, genome comparison of the region around the xkdK gene between Bl 1821L and Bl 1951 found differences including two glycine rich protein encoding genes which contain imperfect repeats (1700 bp) in Bl 1951, while a putative phage region resides in the analogous Bl 1821L region. Although comparative analysis of the genomic organisation of Bl 1821L and Bl 1951 PBSX-like region with the defective phages PBSX, PBSZ, and PBP 180 of Bacillus subtilis isolates 168 and W23, and Bacillus phage PBP180 revealed low amino acids similarity, the genes encode similar functional proteins in similar arrangements, including phage tail-sheath (XkdK), tail (XkdO), holin (XhlB), and N-acetylmuramoyl-l-alanine (XlyA). AMPA analysis identified a bactericidal stretch of 13 amino acids in the ~48 kD sequenced protein of Bl 1821L. Antagonistic activity of the purified ~48 kD phage tail-like protein in the assays differed remarkably from the crude lysate by causing a decrease of 34.2% in the number of viable cells of Bl 1951, 18 h after treatment as compared to the control. Overall, the identified inducible phage tail-like particle is likely to have implications for the in vitro growth of the insect pathogenic isolate Bl 1821L.
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Affiliation(s)
- Tauseef K. Babar
- Bio-Protection Research Centre, Lincoln University, Lincoln 7674, New Zealand
- Department of Entomology, Faculty of Agriculture Sciences & Technology, Bahauddin Zakariya University, Multan 60000, Pakistan
| | - Travis R. Glare
- Bio-Protection Research Centre, Lincoln University, Lincoln 7674, New Zealand
| | - John G. Hampton
- Bio-Protection Research Centre, Lincoln University, Lincoln 7674, New Zealand
| | - Mark R. H. Hurst
- Resilient Agriculture, AgResearch, Lincoln Research Centre, Christchurch 8140, New Zealand
| | - Josefina O. Narciso
- Bio-Protection Research Centre, Lincoln University, Lincoln 7674, New Zealand
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Moar WJ, Giddings KS, Narva KE, Nelson ME. Enhancing global food security by using bacterial proteins with improved safety profiles to control insect pests. J Invertebr Pathol 2021; 187:107704. [PMID: 34896129 DOI: 10.1016/j.jip.2021.107704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- William J Moar
- Bayer Crop Science, 700 Chesterfield Parkway, Chesterfield, MO 63017, USA.
| | - Kara S Giddings
- Bayer Crop Science, 700 Chesterfield Parkway, Chesterfield, MO 63017, USA
| | - Kenneth E Narva
- Corteva Agriscience, 7300 NW 62nd Ave., Johnston, IA 50131, USA
| | - Mark E Nelson
- Corteva Agriscience, 7300 NW 62nd Ave., Johnston, IA 50131, USA
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Pereira AE, Huynh MP, Carlson AR, Haase A, Kennedy RM, Shelby KS, Coudron TA, Hibbard BE. Assessing the Single and Combined Toxicity of the Bioinsecticide Spear and Cry3Bb1 Protein Against Susceptible and Resistant Western Corn Rootworm Larvae (Coleoptera: Chrysomelidae). JOURNAL OF ECONOMIC ENTOMOLOGY 2021; 114:2220-2228. [PMID: 34453170 DOI: 10.1093/jee/toab160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Indexed: 06/13/2023]
Abstract
The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), poses a serious threat to maize (Zea mays L.) growers in the U.S. Corn Belt. Transgenic corn expressing Bacillus thuringiensis (Bt) Berliner is the major management tactic along with crop rotation. Bt crops targeting WCR populations have been widely planted throughout the Corn Belt. Rootworms have developed resistance to nearly all management strategies including Bt corn. Therefore, there is a need for new products that are not cross-resistant with the current Bt proteins. In this study, we evaluated the susceptibility of WCR strains resistant and susceptible to Cry3Bb1 to the biological insecticide Spear-T (GS-omega/kappa-Hexatoxin-Hv1a) alone and combined with Cry3Bb1 protein. The activity of Hv1a alone was similar between Cry3Bb1-resistant and susceptible strains (LC50s = 0.95 mg/cm2 and 1.50 mg/cm2, respectively), suggesting that there is no cross-resistance with Cry3Bb1 protein. Effective concentration (EC50), molt inhibition concentration (MIC50), and inhibition concentration (IC50) values of Hv1a alone were also similar between both strains, based on non-overlapping confidence intervals. Increased mortality (64%) was observed on resistant larvae exposed to Hv1a (0.6 mg/cm2) + Cry3Bb1 protein (170.8 µg/cm2) compared to 0% mortality when exposed to Cry3Bb1 alone and 34% mortality to Hv1a alone (0.3 mg/cm2). The time of larval death was not significantly different between Hv1a alone (3.79 mg/cm2) and Hv1a (0.6 mg/cm2) + Cry3Bb1 (170.8 µg/cm2). New control strategies that are not cross-resistant with current insecticides and Bt proteins are needed to better manage the WCR, and Hv1a together with Cry3Bb1 may fit this role.
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Affiliation(s)
- Adriano E Pereira
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA
| | - Man P Huynh
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA
| | | | | | | | - Kent S Shelby
- Biological Control of Insect Research Laboratory, USDA/ARS, Columbia, MO, USA
| | - Thomas A Coudron
- Biological Control of Insect Research Laboratory, USDA/ARS, Columbia, MO, USA
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Kouadio JL, Duff S, Aikins M, Zheng M, Rydel T, Chen D, Bretsnyder E, Xia C, Zhang J, Milligan J, Evdokimov A, Nageotte J, Yin Y, Moar W, Giddings K, Park Y, Jerga A, Haas J. Structural and functional characterization of Mpp75Aa1.1, a putative beta-pore forming protein from Brevibacillus laterosporus active against the western corn rootworm. PLoS One 2021; 16:e0258052. [PMID: 34634061 PMCID: PMC8504720 DOI: 10.1371/journal.pone.0258052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 09/16/2021] [Indexed: 12/16/2022] Open
Abstract
The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, is a major corn pest of significant economic importance in the United States. The continuous need to control this corn maize pest and the development of field-evolved resistance toward all existing transgenic maize (Zea mays L.) expressing Bacillus thuringiensis (Bt) insecticidal proteins against WCR has prompted the development of new insect-protected crops expressing distinct structural classes of insecticidal proteins. In this current study, we describe the crystal structure and functional characterization of Mpp75Aa1.1, which represents the first corn rootworm (CRW) active insecticidal protein member of the ETX_MTX2 sub-family of beta-pore forming proteins (β-PFPs), and provides new and effective protection against WCR feeding. The Mpp75Aa1.1 crystal structure was solved at 1.94 Å resolution. The Mpp75Aa1.1 is processed at its carboxyl-terminus by WCR midgut proteases, forms an oligomer, and specifically interacts with putative membrane-associated binding partners on the midgut apical microvilli to cause cellular tissue damage resulting in insect death. Alanine substitution of the surface-exposed amino acids W206, Y212, and G217 within the Mpp75Aa1.1 putative receptor binding domain I demonstrates that at least these three amino acids are required for WCR activity. The distinctive spatial arrangement of these amino acids suggests that they are part of a receptor binding epitope, which may be unique to Mpp75Aa1.1 and not present in other ETX_MTX2 proteins that do not have WCR activity. Overall, this work establishes that Mpp75Aa1.1 shares a mode of action consistent with traditional WCR-active Bt proteins despite significant structural differences.
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Affiliation(s)
- Jean-Louis Kouadio
- Bayer Crop Science, Chesterfield, Missouri, United States of America
- * E-mail:
| | - Stephen Duff
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Michael Aikins
- Department of Entomology, Kansas State University, Manhattan, Kansas, United States of America
| | - Meiying Zheng
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Timothy Rydel
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Danqi Chen
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Eric Bretsnyder
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Chunsheng Xia
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jun Zhang
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jason Milligan
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Artem Evdokimov
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jeffrey Nageotte
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Yong Yin
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - William Moar
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Kara Giddings
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Yoonseong Park
- Department of Entomology, Kansas State University, Manhattan, Kansas, United States of America
| | - Agoston Jerga
- Bayer Crop Science, Chesterfield, Missouri, United States of America
| | - Jeffrey Haas
- Bayer Crop Science, Chesterfield, Missouri, United States of America
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Bedini S, Conti B, Hamze R, Muniz ER, Fernandes ÉKK, Ruiu L. Lethal and sub-lethal activity of Brevibacillus laterosporus on the mosquito Aedes albopictus and side effects on non-target water-dwelling invertebrates. J Invertebr Pathol 2021; 184:107645. [PMID: 34245776 DOI: 10.1016/j.jip.2021.107645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 06/29/2021] [Accepted: 07/04/2021] [Indexed: 11/17/2022]
Abstract
The biocidal potential of Brevibacillus laterosporus against mosquitoes of major medical importance has been widely documented, but its effects on non-target invertebrates are still poorly known. In this study, we determined the lethal and sub-lethal effects of B. laterosporus strain UNISS 18, an entomopathogenic bacterium known for its effectiveness against synanthropic Diptera, on the larvae of the Asian tiger mosquito Aedes albopictus, a vector of several pathogens to humans. Moreover, we compared the larvicidal activity with the lethal action on the invasive snail Physella acuta and on two non-target water-dwelling species: the mayfly Cloeon dipterum, and the harlequin fly Chironomus riparius. B. laterosporus exhibited significant lethal effects on all the tested species with a concentration-dependent activity. However, the susceptibility varied among species, with a higher susceptibility of Ae. albopictus (LC50 = 0.16 × 107 spores mL-1) than the other species (LC50 = 0.31, 0.33, and 0.30 × 107 spores mL-1 for C. dipterum, C. riparius, and P. acuta, respectively). While 1st instar mosquito larvae were very susceptible to the bacterial infection, no effects on preimaginal development stages and adult emergence were observed at sub-lethal spores' concentrations. Even if the efficacy of B. laterosporus against Ae. albopictus and the invasive freshwater snail P. acuta is promising for their control, the susceptibility of non-target beneficial aquatic insects, highlights the need of accurate evaluations before applying B. laterosporus for pest management in water environments.
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Affiliation(s)
- Stefano Bedini
- Department of Agriculture, Food and Environment (DAFE), University of Pisa, Via del Borghetto, 80 - 56124 Pisa, Italy
| | - Barbara Conti
- Department of Agriculture, Food and Environment (DAFE), University of Pisa, Via del Borghetto, 80 - 56124 Pisa, Italy.
| | - Rim Hamze
- Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy; Lebanese University, Faculty of Agriculture and Veterinary Science, Beirut, Lebanon
| | - Elen Regozino Muniz
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO 74690-900, Brazil
| | - Éverton K K Fernandes
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO 74690-900, Brazil
| | - Luca Ruiu
- Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy; Mediterranean Centre for Disease Control, University of Sassari, Via Vienna 2, 07100 Sassari, Italy.
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Paddock KJ, Robert CAM, Erb M, Hibbard BE. Western Corn Rootworm, Plant and Microbe Interactions: A Review and Prospects for New Management Tools. INSECTS 2021; 12:171. [PMID: 33671118 PMCID: PMC7922318 DOI: 10.3390/insects12020171] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/11/2021] [Accepted: 02/13/2021] [Indexed: 12/12/2022]
Abstract
The western corn rootworm, Diabrotica virgifera virgifera LeConte, is resistant to four separate classes of traditional insecticides, all Bacillius thuringiensis (Bt) toxins currently registered for commercial use, crop rotation, innate plant resistance factors, and even double-stranded RNA (dsRNA) targeting essential genes via environmental RNA interference (RNAi), which has not been sold commercially to date. Clearly, additional tools are needed as management options. In this review, we discuss the state-of-the-art knowledge about biotic factors influencing herbivore success, including host location and recognition, plant defensive traits, plant-microbe interactions, and herbivore-pathogens/predator interactions. We then translate this knowledge into potential new management tools and improved biological control.
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Affiliation(s)
- Kyle J. Paddock
- Division of Plant Sciences, University of Missouri, Columbia, MO 65211, USA;
| | - Christelle A. M. Robert
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland; (C.A.M.R.); (M.E.)
- Oeschger Centre for Climate Change Research, University of Bern, 3013 Bern, Switzerland
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland; (C.A.M.R.); (M.E.)
- Oeschger Centre for Climate Change Research, University of Bern, 3013 Bern, Switzerland
| | - Bruce E. Hibbard
- Plant Genetics Research Unit, United States Department of Agriculture, Agricultural Research Service, Columbia, MO 65211, USA
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