Jan Nyrop
Professor
jpn2@cornell.edu

Areas of Expertise

Integrated pest management, biological control, sampling and decision making, risk assessment, population ecology, invasive species

Research

The goal of my research is to develop the tools required for biologically-based management of arthropods in horticultural crops.  I work towards this goal along three programmatic thrusts; biological control, pest control decision making, and quantitative population ecology.  My biological control research focuses on improving the effectiveness of natural enemies in selected cropping systems.  This is exemplified through my research on plant habitat mediated mite predator-prey and whitefly-predator dynamcis.  In this work I have asked what characterizes a successful mite biological control agent, how crop management practices can be modified to encourage biological control, and how tri-trophic interactions mediate biological control.  Pest control decision making is one of the foundations of pest management and this research addresses tools for measuring pest abundance, understanding pest impact on crops, and risk assessment for non-indigenous species.  Currently I am working collaboratively to prepare a second edition of a book on this topic.  In addition to my research I also have a strong commitment to teaching.  I currently teach, in collaboration with Ann Hajek, a course entitled "Invasions" which addresses the biological, economic and philosophical aspects of species invasions.

Courses Taught

ENTOM 2020 Invasions (co-taught with A. Hajek)

Publications (last 5 years)

• Loughner R, Wentworth K, Loeb G, Nyrop J. 2010. Influence of leaf trichomes on predatory mite density and distribution in plant assemblages and implications for biological control. Biological Control, 54, 255-262.
• Sarvary, M.A., Nyrop, J., Reissig, H. 2010. Effects of natural enemies and host plants in wild and orchard habitats on obliquebanded leafrollers (Lepidoptera: Tortridicae) larval survival. Ecological Entomology, 55 (2), 110-117.
• Agnello, A. M., A. Atanassov, J. C. Bergh, D. J. Biddinger, L. J. Gut, M. J. Haas, J. K. Harper, H. W. Hogmire, L. A. Hull, L. F. Kime, G. Krawczyk, P. S. McGhee, J. P. Nyrop, W. H. Reissig, P. W. Shearer, R. W. Straub, R. T. Villanueva, and J. F. Walgenbach 2009. Reduced-risk pest management programs for eastern U.S. apple and peach orchards: a 4-year regional project. Amer. Entomol. 55:184-197.
• Loughner R, Wentworth K, Loeb G, Nyrop J  2009 Leaf trichomes influence predatory mite densities through dispersal behavior. Entomol Exp Appl 134:78-88
• Lee, Doo-Hyung, Nyrop, J. P., Sanderson, J. P.  2009. Attraction of Trialeurodes vaporariorum and Bemisia argentifolii to eggplant, and its potential as a trap crop for whitefly management on greenhouse poinsettia. Entomol. Exp. Appl. 133: 105–116
• Loughner R ; Goldman K ; Loeb G ; Nyrop J. 2008  Influence of leaf trichomes on predatory mite (Typhlodromus pyri) abundance in grape varieties. Experimental and Applied Acarology 45:111-122
• Luczynski A, Nyrop JP, Shi A  2008 Pattern of female reproductive age classes in mass-reared populations of Phytoseiulus persimilis (Acari: Phytoseiidae) and its influence on population characteristics and quality of predators following cold storage. Biological Control. 47:159-166
• Sarvary, M.A., Nyrop, J., Reissig, H. 2007. Assessment of three techniques for measuring natural enemy inflicted mortality of leafroller larvae in commercial orchards. Biological control. 41(3):312-320.
• Sarvary, M. A., Nyrop, J. P., Reissig, H. and K. M. Gifford.  2007. Potential for conservation biological control of the obliquebanded leafroller (OBLR) Choristoneura rosaceana (Harris) in orchard systems managed with reduced-risk insecticides.  Biological Control. 40:37-47.
• Luczynski, A., Nyrop, J.P. and A. Sh.  2007.i Influence of cold storage on pupal development and mortality during storage and on post-storage performance of Encarsia formosa and Eretmocerus eremicus (Hymenoptera: Aphelinidae)  Biological Control. 40:107-117
• Reissig, H.; Sarvary, M.; Nyrop, J. 2007. Ecology and management of the obliquebanded leafroller, Choristoneura rosaceana, in New York apple orchards. IOBC-WPRS Bulletin. 30:61-66
• Musser F. R., Nyrop J. P. and Shelton A. M. 2006 Integrating biological and chemical controls in decision making: European Corn Borer (Lepidoptera: Crambidae) control in sweet corn as an example. J. Econom. Entomol. 99:1538–1549.
• Nault, B. A., Zhao, J. Z., Straub, R. W., Nyrop, J.P., and Hessney, M. L.  2006. Onion maggot (Diptera Anthomyiidae) resistance to chlorpyrifos in New York onion fields. J Econ Entomol. 99:1375-1380.
• Nyrop, J. P. and Lakso, A. N.  2006. Modeling from a crop protection decision support perspective what is most important? Acta Hort. 707:187-195.
• Renkema, J. M., Nyrop, J. P., Difonzo, C.,  Sears, M. K. and Schaafsma, A. W. 2006. Control decision rule for European chafer (Coleoptera Scarabaeidae) larvae in field corn.  J. Econ. Entomol. 99:76-84.
• Werling, B. P., J. P. Nyrop and B. Nault.  2006.  Spatial and temporal patterns of onion adult activity and oviposition within onion fields that vary in bordering habitat. Entomol. Exp. Applicat. 118: 49–59