Entomology Grad-web

Doctoral Student

DAVID CROWDER

Advisor:

Yves Carrière and Bruce Tabashnik

Contact Info:

Marley 612
(520) 621-5346
dcrowder@ag.arizona.edu

Research and Interests:

My research focuses on integrated pest management (IPM) and insect resistance management (IRM) strategies in cotton for the sweet-potato whitefly, Bemisia tabaci. Specifically, I will use simulation models to investigate the impact of management strategies designed to prevent resistance to pyriproxyfen, an insect growth regulator. I will also perform laboratory and field experiments to investigate several factors affecting the evolution of resistance.

Publications:

Crowder, D. W., C. Ellers-Kirk, C. Yafuso, T. J. Dennehy, B. A. Degain, V. S. Harpold, B. E. Tabashnik, and Y. Carrère. 2008. Inheritance of resistance to pyriproxyfen in Bemisia tabaci (Hemiptera: Aleyrodidae) males and females (B biotype). J. Econ. Entomol. In press.
Tabashnik, B. E., A. J. Gassmann, D. W. Crowder, and Y. Carrière. 2008. Insect resistance to transgenic crops: evidence versus theory. Nat. Biotechnol. In press.
Crowder, D. W., T. J. Dennehy, C. Ellers-Kirk, C. Yafuso, P. C. Ellsworth, B. E. Tabashnik and Y. Carrière. 2007. Field evaluation of pyriproxyfen resistance in Bemisia tabaci (B Biotype). J. Econ. Entomol. 100: 1650-1656.
Crowder, D. W. 2007. Impact of release rates on the effectiveness of augmentative biological control agents, 11pp. J. Insect. Sci. 7:15, available online: insectscience.org/7.15.
Onstad, D. W., B. E. Hibbard, T. L. Clark, D. W. Crowder, and K. G. Carter. 2006. Analysis of density-dependent survival of Diabrotica (Coleoptera: Chrysomelidae) in cornfields. Environ. Entomol. 35: 1272-1278.
Crowder, D. W., Y. Carrière, B. E. Tabashnik, P. C. Ellsworth, and T. J. Dennehy. 2006. Modeling evolution of resistance to pyriproxyfen by the sweet-potato whitefly (Homoptera: Aleyrodidae). J. Econ. Entomol. 99: 1396-1406.
Crowder, D. W., D. W. Onstad, and M. E. Gray. 2006. Planting transgenic insecticidal crops based on economic thresholds: consequences for integrated pest management and insect resistance management. J. Econ. Entomol. 99: 899-907.
Crowder, D. W., D. W. Onstad, M. E. Gray, P. D. Mitchell, J. L. Spencer, and R. J. Brazee. 2005. Economic analysis of dynamic management strategies utilizing transgenic corn for control of western corn rootworm (Coleoptera: Chrysomelidae). J. Econ. Entomol. 98: 961-975.
Crowder, D. W., D. W. Onstad, M. E. Gray, C. M. F. Pierce, A. G. Hager, S. T. Ratcliffe, and K. L. Steffey. 2005. Analysis of the dynamics of adaptation to transgenic corn and crop rotation by western corn rootworm (Coleoptera: Chrysomelidae) using a daily time-step model. J. Econ. Entomol. 98: 534-551.
Crowder, D. W. and D. W. Onstad. 2005. Using a generational time-step model to simulate the dynamics of adaptation to crop rotation and transgenic corn by western corn rootworm (Coleoptera: Chrysomelidae). J. Econ. Entomol. 98: 518-533.
Onstad, D. W., C. A. Guse, and D. W. Crowder. 2004. Heterogeneous landscapes and variable behavior: modeling rootworm evolution and geographic spread, pp 155-167. In Western Corn Rootworm: Ecology and Management. S. Vidal, U. Kuhlmann, and C. R. Edwards, eds. CAB Publishing, Wallingford, UK.
Onstad, D. W., D. W. Crowder, P. D. Mitchell, C. A. Guse, J. L. Spencer, E. Levine, and M. E. Gray. 2003. Economics versus alleles: balancing IPM and IRM for rotation-resistant western corn rootworm. J. Econ. Entomol. 96: 1872-1885.
Goertz, D., D. Onstad, D. Crowder, and A. Linde. 2003. Modellierung des einflusses von insektenpathogenen (mikrosporidien) auf die populationsdynamik eines Forstschädlings, Lymantria dispar L. Mitt. Dtsch. Ges. Allgem. Angew. Ent. 14: 245-248.
Onstad, D. W., D. W. Crowder, S. A. Isard., E. Levine, J. L. Spencer, L. W. Bledso e, M. E. O’Neil, J. B. Eisley, M. E. Gray, S. A. Ratcliffe, C. D. DiFonzo, and C. R. Edwards. 2003. Does landscape diversity affect the spread of the rotation-resistant western corn rootworm (Coleoptera: Chrysomelidae)? Environ. Entomol. 32: 992-1001.