- Professor, Entomology
- Professor, BIO5 Institute
- Professor, Entomology / Insect Science - GIDP
- Ph.D. Biology/Entomology
- Simon Fraser University, Burnaby, Canada
- Member of Research Group "Living with Resistance"
- NSF, Spring 2019
Landscape Ecology for IPM; Resistance management for Bt crops; Environmental impacts of Bt crops; Insect Ecology
Agro-ecologyEIS 536 (Spring 2019)
Agro-ecologyENTO 436 (Spring 2019)
Agro-ecologyENVS 436 (Spring 2019)
Agro-ecologyPLS 436 (Spring 2019)
Agro-ecologyPLS 536 (Spring 2019)
Agro-ecologyRNR 436 (Spring 2019)
Agro-ecologyRNR 536 (Spring 2019)
DissertationEIS 920 (Spring 2019)
ThesisEIS 910 (Spring 2019)
ResearchEIS 900 (Fall 2018)
ThesisEIS 910 (Fall 2018)
Agro-ecologyEIS 536 (Spring 2018)
Agro-ecologyENTO 436 (Spring 2018)
Agro-ecologyENVS 436 (Spring 2018)
Agro-ecologyENVS 536 (Spring 2018)
Agro-ecologyPLS 436 (Spring 2018)
Agro-ecologyRNR 436 (Spring 2018)
Agro-ecologyRNR 536 (Spring 2018)
Independent StudyEIS 599 (Spring 2018)
ResearchEIS 900 (Spring 2018)
ThesisEIS 910 (Spring 2018)
ResearchEIS 900 (Fall 2017)
Agro-ecologyEIS 536 (Spring 2017)
Agro-ecologyENTO 436 (Spring 2017)
Agro-ecologyENVS 436 (Spring 2017)
Agro-ecologyENVS 536 (Spring 2017)
Agro-ecologyPLS 436 (Spring 2017)
Agro-ecologyRNR 436 (Spring 2017)
Agro-ecologyRNR 536 (Spring 2017)
- Carriere, Y., & al, e. (2019). Gossypol in cottonseed increases the fitness cost of resistance to Bt cotton in pink bollworm. Crop Protection.
- Carrière, Y., Brown, Z. S., Downes, S. J., Gujar, G., Epstein, G., Omoto, C., Storer, N. P., Mota-Sanchez, D., Søgaard Jørgensen, P., & Carroll, S. P. (2019). Governing evolution: A socioecological comparison of resistance management for insecticidal transgenic Bt crops among four countries. Ambio, 49(1), 1-16.More infoCooperative management of pest susceptibility to transgenic Bacillus thuringiensis (Bt) crops is pursued worldwide in a variety of forms and to varying degrees of success depending on context. We examine this context using a comparative socioecological analysis of resistance management in Australia, Brazil, India, and the United States. We find that a shared understanding of resistance risks among government regulators, growers, and other actors is critical for effective governance. Furthermore, monitoring of grower compliance with resistance management requirements, surveillance of resistance, and mechanisms to support rapid implementation of remedial actions are essential to achieve desirable outcomes. Mandated resistance management measures, strong coordination between actors, and direct linkages between the group that appraises resistance risks and growers also appear to enhance prospects for effective governance. Our analysis highlights factors that could improve current governance systems and inform other initiatives to conserve susceptibility as a contribution to the cause of public good.
- Carrière, Y., Degain, B., Unnithan, G. C., Harpold, V. S., Li, X., & Tabashnik, B. E. (2019). Seasonal Declines in Cry1Ac and Cry2Ab Concentration in Maturing Cotton Favor Faster Evolution of Resistance to Pyramided Bt Cotton in Helicoverpa zea (Lepidoptera: Noctuidae). Journal of economic entomology, 112(6), 2907-2914.More infoUnder ideal conditions, widely adopted transgenic crop pyramids producing two or more distinct insecticidal proteins from Bacillus thuringiensis (Bt) that kill the same pest can substantially delay evolution of resistance by pests. However, deviations from ideal conditions diminish the advantages of such pyramids. Here, we tested the hypothesis that changes in maturing cotton producing Cry1Ac and Cry2Ab affect evolution of resistance in Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), a pest with low inherent susceptibility to both toxins. In terminal leaves of field-grown Bt cotton, the concentration of both toxins was significantly higher for young, squaring plants than for old, fruiting plants. We used laboratory bioassays with plant material from field-grown cotton to test H. zea larvae from a strain selected for resistance to Cry1Ac in the laboratory, its more susceptible parent strain, and their F1 progeny. On young Bt cotton, no individuals survived to pupation. On old Bt cotton, survival to pupation was significantly higher for the lab-selected strain and the F1 progeny relative to the unselected parent strain, indicating dominant inheritance of resistance. Redundant killing, the extent to which insects resistant to one toxin are killed by another toxin in a pyramid, was complete on young Bt cotton, but not on old Bt cotton. No significant fitness costs associated with resistance were detected on young or old non-Bt cotton. Incorporation of empirical data into simulations indicates the observed increased selection for resistance on old Bt cotton could accelerate evolution of resistance to cotton producing Cry1Ac and Cry2Ab in H. zea.
- Fabrick, J. A., Mathew, L. G., LeRoy, D. M., Hull, J. J., Unnithan, G. C., Yelich, A. J., Carrière, Y., Li, X., & Tabashnik, B. E. (2019). Reduced cadherin expression associated with resistance to Bt toxin Cry1Ac in pink bollworm. Pest management science, 76(1), 67-74.More infoBetter understanding of the molecular basis of resistance is needed to improve management of pest resistance to transgenic crops that produce insecticidal proteins from Bacillus thuringiensis (Bt). Here we analyzed resistance of the pink bollworm (Pectinophora gossypiella) to Bt toxin Cry1Ac, which is used widely in transgenic Bt cotton. Field-evolved practical resistance of pink bollworm to Cry1Ac is widespread in India, but not in China or the United States. Previous work with laboratory- and field-selected pink bollworm indicated that resistance to Cry1Ac is caused by changes in the amino acid sequence of a midgut cadherin protein (PgCad1) that binds Cry1Ac in susceptible larvae.
- Li, S., Hussain, F., Unnithan, G. C., Dong, S., UlAbdin, Z., Gu, S., Mathew, L. G., Fabrick, J. A., Ni, X., Carrière, Y., Tabashnik, B. E., & Li, X. (2019). A long non-coding RNA regulates cadherin transcription and susceptibility to Bt toxin Cry1Ac in pink bollworm, Pectinophora gossypiella. Pesticide biochemistry and physiology, 158, 54-60.More infoExtensive planting of transgenic crops producing insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) has spurred increasingly rapid evolution of resistance in pests. In the pink bollworm, Pectinophora gossypiella, a devastating global pest, resistance to Bt toxin Cry1Ac produced by transgenic cotton is linked with mutations in a gene (PgCad1) encoding a cadherin protein that binds Cry1Ac in the larval midgut. We previously reported a long non-coding RNA (lncRNA) in intron 20 of cadherin alleles associated with both resistance and susceptibility to Cry1Ac. Here we tested the hypothesis that reducing expression of this lncRNA decreases transcription of PgCad1 and susceptibility to Cry1Ac. Quantitative RT-PCR showed that feeding susceptible neonates small interfering RNAs (siRNAs) targeting this lncRNA but not PgCad1 decreased the abundance of transcripts of both the lncRNA and PgCad1. Moreover, neonates fed the siRNAs had lower susceptibility to Cry1Ac. The results imply that the lncRNA increases transcription of PgCad1 and susceptibility of pink bollworm to Cry1Ac. The results suggest that disruption of lncRNA expression could be a novel mechanism of pest resistance to Bt toxins.
- Tabashnik, B. E., & Carrière, Y. (2019). Evaluating Cross-resistance Between Vip and Cry Toxins of Bacillus thuringiensis. Journal of economic entomology.More infoCrops genetically engineered to produce insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) have revolutionized control of some major pests. Some recently introduced Bt crops make Vip3Aa, a vegetative insecticidal protein (Vip), which reportedly does not share binding sites or structural homology with the crystalline (Cry) proteins of Bt used widely in transgenic crops for more than two decades. Field-evolved resistance to Bt crops with practical consequences for pest control includes 21 cases that collectively reduce the efficacy of nine Cry proteins, but such practical resistance has not been reported yet for any Vip. Here, we review previously published data to evaluate cross-resistance between Vip and Cry toxins. We analyzed 31 cases based on 48 observations, with each case based on one to five observations assessing cross-resistance from pairwise comparisons between 21 resistant strains and 13 related susceptible strains of eight species of lepidopteran pests. Confirming results from previous analyses of smaller data sets, we found weak, statistically significant cross-resistance between Vip3 and Cry1 toxins, with a mean of 1.5-fold cross-resistance in 21 cases (range: 0.30-4.6-fold). Conversely, we did not detect significant positive cross-resistance between Vip3 toxins and Cry2Ab. Distinguishing between weak, significant cross-resistance, and no cross-resistance may be useful for better understanding mechanisms of resistance and effectively managing pest resistance to Bt crops.
- Tabashnik, B. E., & Carrière, Y. (2019). Global Patterns of Resistance to Bt Crops Highlighting Pink Bollworm in the United States, China, and India. Journal of economic entomology, 112(6), 2513-2523.More infoCrops genetically engineered to produce insecticidal proteins from Bacillus thuringiensis (Bt) have advanced pest control, but their benefits have been reduced by evolution of resistance in pests. The global monitoring data reviewed here reveal 19 cases of practical resistance to Bt crops, which is field-evolved resistance that reduces Bt crop efficacy and has practical consequences for pest control. Each case represents the responses of one pest species in one country to one Bt toxin. The results with pink bollworm (Pectinophora gossypiella) and Bt cotton differ strikingly among the world's three leading cotton-producing nations. In the southwestern United States, farmers delayed resistance by planting non-Bt cotton refuges from 1996 to 2005, then cooperated in a program that used Bt cotton, mass releases of sterile moths, and other tactics to eradicate this pest from the region. In China, farmers reversed low levels of pink bollworm resistance to Bt cotton by planting second-generation hybrid seeds from crosses between Bt and non-Bt cotton. This approach yields a refuge of 25% non-Bt cotton plants randomly interspersed within fields of Bt cotton. Farmers adopted this tactic voluntarily and unknowingly, not to manage resistance, but apparently because of its perceived short-term agronomic and economic benefits. In India, where non-Bt cotton refuges have been scarce and pink bollworm resistance to pyramided Bt cotton producing Cry1Ac and Cry2Ab toxins is widespread, integrated pest management emphasizing shortening of the cotton season, destruction of crop residues, and other tactics is now essential.
- Zhang, M., & al., e. (2019). Decreased Cry1Ac activation by midgut proteases is associated with Cry1Ac resistance in Helicoverpa zea.. Pest Management Science, 75, 1099-1106.
- Carrière, Y., Degain, B. A., Unnithan, G. C., Harpold, V. S., Heuberger, S., Li, X., & Tabashnik, B. E. (2018). Effects of seasonal changes in cotton plants on the evolution of resistance to pyramided cotton producing the Bt toxins Cry1Ac and Cry1F in Helicoverpa zea. Pest management science, 74(3), 627-637.More infoIn pests with inherently low susceptibility to Bacillus thuringiensis (Bt) toxins, seasonal declines in the concentration of Bt toxins in transgenic crops could accelerate evolution of resistance by increasing the dominance of resistance. Here, we evaluated Helicoverpa zea survival on young and old cotton plants that produced the Bt toxins Cry1Ac and Cry1F or did not produce Bt toxins.
- Carrière, Y., Williams, J. L., Crowder, D. W., & Tabashnik, B. E. (2018). Genotype-specific fitness cost of resistance to Bt toxin Cry1Ac in pink bollworm. Pest management science, 74(11), 2496-2503.More infoTo improve resistance management strategies for Bacillus thuringiensis (Bt) crops, a better understanding of the relative fitness of pest genotypes with resistance alleles in the absence of Bt toxins is needed. Here, we evaluated the impact of costs of resistance to Bt toxin Cry1Ac on the relative fitness of specific pink bollworm (Pectinophora gossypiella) genotypes. We created two heterogeneous strains with an intermediate frequency of mutant cadherin alleles linked with resistance to Cry1Ac, reared the strains on diet without Bt and tracked the decline in frequency of resistant genotypes for 15-30 generations using polymerase chain reaction amplification. We used a population genetics model and sensitivity analyses to estimate the relative fitness of resistant genotypes.
- Jørgensen, P. S., & (21 authors), e. a. (2018). Antibiotic and pesticide susceptibility and the Anthropocene operating space. Nature Sustainability, 1, 632–641. doi:https://doi.org/10.1038/s41893-018-0164-3More infoRising levels of antimicrobial and pesticide resistance increasingly undermine human health and systems for biomass production, and emphasize the sustainability challenge of preserving organisms susceptible to these biocides. In this Review, we introduce key concepts and examine dynamics of biocide susceptibility that must be governed to address this challenge. We focus on the impact of biocides on the capacity of susceptible organisms to prevent spread of resistance, and we then review how biocide use affects a broader suite of ecosystem services. Finally, we introduce and assess the state of what we term the Anthropocene operating space of biocide susceptibility, a framework for assessing the potential of antibiotic and pesticide resistance to undermine key functions of human society. Based on current trends in antibiotic, insecticide and herbicide resistance, we conclude that the states of all six assessed variables are beyond safe zones, with three variables surpassed regionally or globally.
- Karp, D. S., Chaplin-Kramer, R., Meehan, T. D., Martin, E. A., DeClerck, F., Grab, H., Gratton, C., Hunt, L., Larsen, A. E., Martínez-Salinas, A., O'Rourke, M. E., Rusch, A., Poveda, K., Jonsson, M., Rosenheim, J. A., Schellhorn, N. A., Tscharntke, T., Wratten, S. D., Zhang, W., , Iverson, A. L., et al. (2018). Crop pests and predators exhibit inconsistent responses to surrounding landscape composition. Proceedings of the National Academy of Sciences of the United States of America, 115(33), E7863-E7870.More infoThe idea that noncrop habitat enhances pest control and represents a win-win opportunity to conserve biodiversity and bolster yields has emerged as an agroecological paradigm. However, while noncrop habitat in landscapes surrounding farms sometimes benefits pest predators, natural enemy responses remain heterogeneous across studies and effects on pests are inconclusive. The observed heterogeneity in species responses to noncrop habitat may be biological in origin or could result from variation in how habitat and biocontrol are measured. Here, we use a pest-control database encompassing 132 studies and 6,759 sites worldwide to model natural enemy and pest abundances, predation rates, and crop damage as a function of landscape composition. Our results showed that although landscape composition explained significant variation within studies, pest and enemy abundances, predation rates, crop damage, and yields each exhibited different responses across studies, sometimes increasing and sometimes decreasing in landscapes with more noncrop habitat but overall showing no consistent trend. Thus, models that used landscape-composition variables to predict pest-control dynamics demonstrated little potential to explain variation across studies, though prediction did improve when comparing studies with similar crop and landscape features. Overall, our work shows that surrounding noncrop habitat does not consistently improve pest management, meaning habitat conservation may bolster production in some systems and depress yields in others. Future efforts to develop tools that inform farmers when habitat conservation truly represents a win-win would benefit from increased understanding of how landscape effects are modulated by local farm management and the biology of pests and their enemies.
- Mathew, L. G., Ponnuraj, J., Mallappa, B., Chowdary, L. R., Zhang, J., Tay, W. T., Walsh, T. K., Gordon, K. H., Heckel, D. G., Downes, S., Carrière, Y., Li, X., Tabashnik, B. E., & Fabrick, J. A. (2018). ABC transporter mis-splicing associated with resistance to Bt toxin Cry2Ab in laboratory- and field-selected pink bollworm. Scientific reports, 8(1), 13531.More infoEvolution of pest resistance threatens the benefits of genetically engineered crops that produce Bacillus thuringiensis (Bt) insecticidal proteins. Strategies intended to delay pest resistance are most effective when implemented proactively. Accordingly, researchers have selected for and analyzed resistance to Bt toxins in many laboratory strains of pests before resistance evolves in the field, but the utility of this approach depends on the largely untested assumption that laboratory- and field-selected resistance to Bt toxins are similar. Here we compared the genetic basis of resistance to Bt toxin Cry2Ab, which is widely deployed in transgenic crops, between laboratory- and field-selected populations of the pink bollworm (Pectinophora gossypiella), a global pest of cotton. We discovered that resistance to Cry2Ab is associated with mutations disrupting the same ATP-binding cassette transporter gene (PgABCA2) in a laboratory-selected strain from Arizona, USA, and in field-selected populations from India. The most common mutation, loss of exon 6 caused by alternative splicing, occurred in resistant larvae from both locations. Together with previous data, the results imply that mutations in the same gene confer Bt resistance in laboratory- and field-selected strains and suggest that focusing on ABCA2 genes may help to accelerate progress in monitoring and managing resistance to Cry2Ab.
- Moore Brusca, W., Carriere, Y., Smith, R. L., Papaj, D. R., Davidowitz, G., & Schaller, J. (2018). Molecular phylogeny, ecology and multispecies aggregation behaviour of bombardier beetles in Arizona. PLoS ONE, 13(10), e0205192.
- Schaller, J. C., Davidowitz, G., Papaj, D. R., Smith, R. L., Carrière, Y., & Moore, W. (2018). Molecular phylogeny, ecology and multispecies aggregation behaviour of bombardier beetles in Arizona. PloS one, 13(10), e0205192.More infoAggregations of conspecific animals are common and have been documented in most phyla. Multispecies aggregations are less common and less well studied. Eight species of Brachinus beetles -famous for their unique, highly effective, chemical defense-regularly settle together form large diurnal multispecies aggregations in dark, moist areas in riparian habitats in the Sonoran Desert Region. Here, we document these multispecies aggregations and investigate the incidence and dynamics of aggregation behavior. Analysis of species composition of 59 field-collected aggregations revealed that 71% contained more than one species, eight species regularly co-occurred in aggregations, and no two species showed a preference to aggregate with one another. We provide the first phylogenetic analyses of participants in multispecies aggregations, and find that Brachinus species found together in aggregations are not each other's closest relatives but rather are dispersed throughout the phylogeny of the genus. Further, we find no tendency for species to aggregate with close relatives more frequently than distant relatives. Laboratory experiments on B. elongatulus showed that it chose to settle in occupied shelters over empty shelters. Experiments with B. hirsutus and B. elongatulus showed that B. hirsutus prefers to settle under shelters housing heterospecifics over conspecifics. Our findings suggest that these multispecies aggregations do not form by chance, but rather are initiated by a genus-wide aggregation cue associated with the presence of individuals already in a shelter, which is likely to be chemical and potentially tactile in nature.
- Vandervoet, T. F., Ellsworth, P. C., Carrière, Y., & Naranjo, S. E. (2018). Quantifying Conservation Biological Control for Management of Bemisia tabaci (Hemiptera: Aleyrodidae) in Cotton. Journal of economic entomology, 111(3), 1056-1068.More infoConservation biological control can be an effective tactic for minimizing insect-induced damage to agricultural production. In the Arizona cotton system, a suite of generalist arthropod predators provides critical regulation of Bemisia tabaci Gennadius (MEAM1) (Hemiptera: Aleyrodidae) and other pests. Arthropod predator and B. tabaci populations were manipulated with a range of broad-spectrum and selective insecticide exclusions to vary predator to prey interactions in a 2-yr field study. Predator to prey ratios associated with B. tabaci densities near the existing action threshold were estimated for six predator species found to be negatively associated with either adult and/or large nymphs of B. tabaci [Misumenops celer (Hentz) (Araneae: Thomisidae), Drapetis nr divergens (Diptera: Empididae), Geocoris pallens Stäl (Hemiptera: Geocoridae), Orius tristicolor (White) (Hemiptera: Anthocoridae), Chrysoperla carnea s.l. (Neuroptera: Chrysopidae), and Collops spp. (Coleoptera: Melyridae)] with the first three most consistently associated with declining B. tabaci densities. Ratios ranged from 1 M. celer per 100 sweeps to 1 B. tabaci adult per leaf to 44 D. nr. divergens per 100 sweeps to 1 large nymph per leaf disk. These ratios represent biological control informed thresholds that might serve as simple-to-use decision tool for reducing risk in the current B. tabaci integrated pest management strategy. The identification of key predators within the large, flexible food web of the cotton agro-ecosystem and estimation of predator to B. tabaci ratios clarifies the role of key predators in B. tabaci suppression, yielding potential decision-making advantages that could contribute to further improving economic and environmental sustainability of insect management in the cotton system.
- Walker, K. R., Williamson, D., Carrière, Y., Reyes-Castro, P. A., Haenchen, S., Hayden, M. H., Jeffrey Gutierrez, E., & Ernst, K. C. (2018). Socioeconomic and Human Behavioral Factors Associated With Aedes aegypti (Diptera: Culicidae) Immature Habitat in Tucson, AZ. Journal of medical entomology, 55(4), 955-963.More infoAedes aegypti (L.; Diptera: Culicidae) has been established in the southwestern United States for several decades, but relationships between humans and mosquitoes in this arid region are not well-characterized. In August 2012, the outdoor premises of 355 houses within 20 neighborhoods in Tucson, Arizona were surveyed for containers that could provide larval habitat for Ae. aegypti mosquitoes. At the same time, a knowledge, attitudes and practices (KAP) questionnaire was administered to a resident of each house surveyed for immature mosquitoes. The KAP questionnaire assessed respondents' knowledge and concerns about vector-borne illnesses as well as practices they used to avoid mosquitoes. Of the houses surveyed, 91% had at least one container present, and 64% had at least one container with standing water. On average, each house had 2.2 containers with water at the time of the survey. The overall House Index (proportion of premises surveyed with at least one container with Ae. aegypti immatures present) was 13%. Based on questionnaire responses, there was a significant positive association between the number of residents in the home and the odds of finding Ae. aegypti positive containers on the premises, while household income showed a significant negative association. The reported frequency of checking for standing water was also significantly associated with the odds of finding immatures, although the nature of this association was ambiguous. Flower pots were the principal type of container with Ae. aegypti larvae. These findings show that larval habitat is widely available even in an arid environment and city with good housing and sanitation infrastructure.
- Zhang, M., Wei, J., Ni, X., Zhang, J., Jurat-Fuentes, J. L., Fabrick, J. A., Carrière, Y., Tabashnik, B. E., & Li, X. (2018). Decreased Cry1Ac activation by midgut proteases associated with Cry1Ac resistance in Helicoverpa zea. Pest management science.More infoField-evolved resistance of Helicoverpa zea to Bacillus thuringiensis (Bt) toxin Cry1Ac was first reported more than a decade ago, yet the underlying mechanisms remain elusive. Towards understanding the mechanisms of resistance to Cry1Ac, we analyzed a susceptible (LAB-S) and two resistant (GA and GA-R) strains of H. zea. The GA strain was derived from Georgia and exposed to Bt toxins only in the field. The GA-R strain was derived from the GA strain and selected for increased resistance to Cry1Ac in the laboratory.
- Orpet, R. J., Degain, B. A., Tabashnik, B. E., & Carriere, Y. (2015). Effects of dietary protein to carbohydrate ratio on Bt toxicity and fitness costs of resistance in Helicoverpa zea.. Entomol. Exp. Appl., 156, 28-36.
- Palumbo, J. C., & Carriere, Y. (2015). Association between Bagrada hilaris density and feeding damage in broccoli: Implications for pest management. Plant Health Progress, 16, 158-162. doi:doi:10.1094/PHP-RS-15-0024
- Carriere, Y. -., Nolte, K. D., Marsh, S. E., Degain, B., Hartfield, K. A., Ellers-Kirk, C., Dutilleul, L. P., van Leeuwen, W. J., & Palumbo, J. C. (2014). Assessing Transmission of Crop Diseases by Insect Vectors in a Landscape Context. Journal of Economic Entomology, 107(1), 10.
- Carriere, Y., & Tabashnik, B. (2019, November). Promises and Pitfalls of Bt Crop Pyramids for Managing Pest Resistance. ESA Annual meeting. St-Louis: ESA.More infoInvited to present at ESA Member symposium “Population Genetics and Pest Control: Advocating a Leading Role for Entomologists.”
- Fabrick, J., Li, X., Carriere, Y., & Tabashnik, B. (2019, January). CRISPR/Cas9 gene editing confirms the function of a Bacillus thuringiensis resistance receptor gene. XXVIII Plant & Animal Genomics Conference. San Diego.More infoInvited to present at workshop
- Carriere, Y., Tabashnik, B., Leisner, L., & Staten, B. (2018, November). Extreme resistance management: Eradication of Pink bollworm in the US and Northern Mexico.. ESA symposium. Vancouver..
- Dixon, W. A., Carriere, Y., Palumbo, J. C., Fournier, A. J., & Ellsworth, P. C. (2018, November). Proactive Resistance Management: Can We Predict, and Ultimately Delay, Resistance Development in Whiteflies Across the Agricultural Landscape?. IRAC Symposium: Impact of Borders on Managing Insect Resistance Management, Entomological Society of America Annual Meeting. Vancouver, British Columbia, Canada: USDA-National Institute of Food and Agriculture.
- Ellsworth, P., Fournier, A., Palumbo, J., Carriere, Y., Dixon, W., & Pier, N. (2018, November). Proactive resistance management: Can we predict, and ultimately delay, resistance development in whiteflies across the agricultural landscape?. ESA Symposium. Vancouver.
- Tabashnik, B., & Carriere, Y. (2018, November). Global surge in pest resistance to Bt crops and prospects for sustainability.. ESA symposium.. Vancouver..
- Carriere, Y. -., & Tabashnik, B. E. (2013, November). Invited symposium presentation: Landscape-based approach for sustaining efficacy of Bt crops (coauthor). Annual Meeting of the Entomological Society of America.
- Ellsworth, P. C., Li, X. -., Carriere, Y. -., Brown, L., & Nichols, R. L. (2013, March). Cotton Pest Management Research Update: Resistance & Resistance Management. Southwest Ag Summit. Arizona Western College, Yuma, AZ: 2013 Southwest Ag Summit.More info30 participants. 0.5 AZ CEU, 0.5 CA CEU, 0.5 CCA CEU
- Ellsworth, P. C., Palumbo, J. C., Carriere, Y. -., Fournier, A. J., & Dixon, W. A. (2013, August). Appropriate Use of Your Data? Mapping Chemical Use Patterns. Arizona Pest Management Center Pesticide Use Database Advisory Committee. Yuma, AZ: Arizona Pest Management Center.More info12 participants
- Ellsworth, P. C., Palumbo, J. C., Carriere, Y. -., Fournier, A. J., & Dixon, W. A. (2013, September). Chemical Use Data & Resistance. Useful?. Late Summer La Paz County Agronomic Workshop. Elks Lodge, Parker, AZ: University of Arizona Cooperative Extension.More info1 AZ CEU; 30 participants
- Tabashnik, B. E., & Carriere, Y. -. (2013, November). Invited syposium presentation: Where and why resistance management has and hasn't succeeded for Bt crops (speaker). Annual Meeting of the Entomological Society of America.
- Ellsworth, P. C., Prabhaker, N. P., Castle, S. J., Brown, L. M., Dixon, W. A., Carriere, Y. P., Palumbo, J. C., Fournier, A. J., & Naomi, P. (2018, March). Adoption of Proactive Resistance Management Practices to Control Bemisia Tabaci in Arizona and California. 9th International IPM Symposium. Baltimore, MD: USDA-National Instituted of Food and Agriculture.
- Walker, K. R., Ernst, K. C., Joy, T., Reyes-Castro, P., Carriere, Y., Castro, L., Diaz-Cervantes, R., Gameros, M., Hayden, M., Monaghan, A., Haenchen, S., Guttierez-Jeffrey, E., & Riehle, M. A. (2015, September). Exploring differential emergence of dengue in two cities with established Aedes aegypti populations: A case study in Sonora, Mexico. 2015 Annual Meeting of the Society for Vector Ecology. Albuquerque, NM.