Peter Shearer

Peter Shearer   

Peter Shearer, Professor of Entomology
Ph.D., Entomology, University of Hawaii at Manoa
M.S., Entomology, Oregon State University
B.S., Plant science, Rutgers University, New Jersey with honors

Phone: 541.386.2030 ext. 38215
Send e-mail to Peter Shearer

Research Areas

Tree fruit entomology, arthropod toxicology, integrated pest management (IPM).

Description of Research

Research activities involve studies on the management of arthropod pests of pome and stone fruits by enhancing IPM strategies and tactics including chemical, cultural, and biological control. Current focus areas include sublethal effects of new pesticides on natural enemies, insecticide resistance management and using herbivore induced host plant volatiles to evaluate impacts of pesticides on target and non-target arthropods.

Publications (Selected)

Mills, Nicholas J., Elizabeth H. Beers, Peter W. Shearer, Thomas R. Unruh, Kaushalya G. Amarasekare. 2015. Comparative analysis of pesticide effects on natural enemies in western orchards: a synthesis of laboratory bioassay data. Biological Control. DOI:10.1016/j.biocontrol.2015.05.006.

Leskey, Tracy C. Arthur Agnello, J. Christopher Bergh, Galen P. Divley, George C. Hamilton, Peter Jentsch, Ashot Khrimian, Grzegorz Krawczyk, Thomas P. Kuhar, Doo-Hyung Lee, William R. Morrison III, Dean F. Polk, Cesar Rodriguez-Soana, Peter W. Shearer, Brent D. Short, Paula M. Shrewsbury, James F. Walgenbach, Donald C. Weber, Celeste Welty, Joanne Whalen, Nik Wiman and Faruque Zaman. 2015. Attraction of the Iinvasive Halyomorpha halys (Hemiptera: Pentatomidae) to traps baited with semiochemical stimuli across the United States. Environ. Entomol. 1–11 DOI: 10.1093/ee/nvv049.

Jones, Vincent P., David R. Horton, Nicholas J. Mills, Thomas R. Unruh, Eugene Miliczky, Peter W. Shearer, Callie C. Baker, Tawnee D. Melton. 2015.  Evaluating plant volatiles for monitoring natural enemies in apple, pear and walnut orchards. DOI: 10.1016/j.biocontrol.2015.03.009.

Murphy, K.A., T.R. Unruh, L.M. Zhou, F.G. Zalom, P.W. Shearer, E.H. Beers, V.M. Walton B. Miller, J. C. Chiu. 2015. Using comparative genomics to develop a molecular diagnostic for the identification of an emerging pest Drosophila suzukii. Bull. Ent. Res. 105. pp 364-372. doi:10.1017/S0007485315000218.

Jones, Vincent P., David R. Horton, Nicholas J. Mills, Thomas R. Unruh, Eugene Miliczky, Peter W. Shearer, Callie C. Baker, Tawnee D. Melton and Kaushalya Amarasekare. 2014. Using plant volatile traps to develop phenology models for natural enemies: An example using Chrysopa nigricornis (Burmeister) (Neuroptera: Chrysopidae). Biological Control. DOI: 10.1016/j.biocontrol.2014.12.012.

Wiman, N.G., V.M. Walton, P.W. Shearer, S.I. Rondon. 2014.  Electronically Monitored Labial Dabbing and Stylet ‘Probing’ Behaviors of Brown Marmorated Stink Bug, Halyomorpha halys, in Simulated Environments. PLoS ONE 9(12): e113514. doi:10.1371/journal.pone.0113514.

Hedstrom, C. S., P.W. Shearer, J.C. Miller, and V. M. Walton. 2014. The Effects of Kernel Feeding by Halyomorpha halys (Hemiptera: Pentatomidae) on Commercial Hazelnuts. J. Econ. Entomol. 107(5): 1858-1865.

Rice, K., C. Bergh, E. Bergman, D. Biddinger, C. Dieckhoff , G. Dively, H. Fraser, Tara G, G. Hamilton, T. Haye, A. Herbert, K. Hoelmer, C. Hooks, A. Jones, G. Krawczyk, T. Kuhar, W. Mitchell, A. Nielsen, D. Pfeiffer, M. Raupp, C. Rodriguez-Saona, P. Shearer, P. Shrewsbury, P. Venugopal, J. Whalen, N.G., Wiman, T. Leskey, J. Tooker. 2014. Biology, Ecology, and Management of Brown Marmorated Stink Bug (Halyomorpha halys). J. Integ. Pest Manage. 5:A1-A13. DOI:

Leskey, T.C., G.C. Hamilton, D.J. Biddinger, M.L. Buffington, C. Dieckhoff, G.P. Dively, H. Fraser, T. Gariepy, C Hedstrom, D.A. Herbert, K.A. Hoelmer, C.R.R. Hooks, D. Inkley, G. Krawczyk, T.P. Kuhar, D-H. Lee, A.L. Nielsen, D.G. Pfeiffer, C. Rodriguez-Saona, P.W. Shearer, E. Talamas, E. Tomasino, J. Tooker, P. D. Venugopal, J. Whalen, V. Walton, and N.G. Wiman. 2014. Datasheet for Halyomorpha halys (Stål), (Hemiptera: Pentatomidae). CABI Crop Protection Compendium and Invasive Species Compendium.

Tochen, S., D.T. Dalton, N.G. Wiman, P.W. Shearer, and V.M. Walton. 2014. Temperature-related development and population parameters for Drosophila suzukii (Diptera: Drosophilidae) on cherry and blueberry. Environ. Entomol. 43: DOI:

Wiman, N. G., V. M. Walton, P. W. Shearer, S. I. Rondon and J. C. Lee. 2014. Factors affecting flight capacity of brown marmorated stink bug, Halyomorpha halys (Hemiptera: Pentatomidae).  J. Pest Sci. DOI 10.1007/s10340-014-0582-6.

Lee, J. C., P. W. Shearer, L. D. Barrantes, E. H. Beers, H. J. Burrack, D. T. Dalton, A. J. Dreves, L. J. Gut, K. A. Hamby, D. R. Haviland, R. Isaacs, A. E. Nielsen, T. Richardson, C. R. Rodriguez-Soana, C. A. Stanley, D. B. Walsh, V. M. Walton, W. L. Yee, F. G. Zalom and D. J. Bruck. 2013. Trap Designs for Monitoring Drosophila suzukii (Diptera: Drosophilidae). Environ. Entomol. 42(6): 1348-1355.

Amarasekare, K. G. and P. W.  Shearer. 2013.  Life history comparison of two green lacewings species, Chrysoperla johnsoni and Chrysoperla carnea (Neuroptera: Chrysopidae).  Environmental Entomology. 42(56): 079-1084.

Amarasekare, K. G. and P. W. Shearer. 2013. Comparing Effects of Insecticides on Two Green Lacewings Species, Chrysoperla johnsoni and Chrysoperla carnea (Neuroptera: Chrysopidae).  J. Econ. Entomol. 106(3): 1126-1133.

Amarasekare, K. G. and P. W. Shearer. 2013. Laboratory bioassays to estimate the lethal and sublethal effects of various insecticides and fungicides on Deraeocoris brevis (Hemiptera: Miridae). Journal of Economic Entomology. 106: 776-785.

Leskey, T.C., G.C. Hamilton, A.L. Nielsen, D.F. Polk, C.Rodriguez-Saona, J.C. Bergh, D. A. Herbert, T.P. Kuhar, D. Pfeiffer, G. Dively, C.R.R. Hooks, M.J. Raupp, P.M. Shrewsbury, G.Krawczyk, P.W. Shearer, J.Whalen, C. Koplinka-Loehr, E. Myers, D. Inkley, K.A. Hoelmer, D-Y. Lee, and S.E. Wright.  2012.  Pest Status of the Brown Marmorated Stink Bug, Halyomorpha halys (Stål), in the USA.  Outlooks on Pest Management. 23(5): 218-226. 

Tollerup, K, A. Rucker and P.W. Shearer. 2012.  Whole Farm Mating Disruption to Manage Grapholita molesta (Lepidoptera: Tortricidae) in Diversified New Jersey Orchards. J. Econ. Entomol. 105(5): 1712-1718.

Lee, Jana C., Hannah J. Burrack, Luz D. Barrantes, Elizabeth H. Beers, Amy J. Dreves, Kelly Hamby, David R. Haviland, Rufus Isaacs, Tamara Richardson, Peter W. Shearer, Cory A. Stanley, Doug B. Walsh, Vaughn M. Walton, Frank G. Zalom,  and Denny J. Bruck. 2012. Evaluation of monitoring traps for Drosophila suzukii (Diptera: Drosophilidae) in North America. J. Econ. Entomol. 105(4): 1350-1357.

Beers, E. H., van Steenwyk, R. A.,Shearer, P. W., Coates, W. W. and Grant, J. A. 2011.  Developing Drosophila suzukii management programs for sweet cherry in the western United States. Pest Manag Sci 67(11): 1386-1395. 

Dalton D.T., Walton V.M., Shearer, P.W., Walsh, D.B., Caprile J. and R. Isaacs. 2011. Laboratory survival of Drosophila suzukii under simulated winter conditions of the Pacific Northwest and seasonal field trapping in five primary regions of small and stone fruit production in the United States. Pest Manag Sci 67(11): 1368-1374.

Nielsen A. L., P. W. Shearer, G. C. Hamilton. 2011. Seasonal phenology and monitoring of the non-native Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) in soybean. Env. Entomol. 40(2): 231-238.

 Jones, V. P., T. R. Unruh, D. R. Horton, N. J. Mills, J. F. Brunner, E. H. Beers, P. W. Shearer. 2009. Tree Fruit IPM Programs in the Western United States: The challenge of enhancing biological control through intensive management. Pest Manag Sci. 2009; 65: 1305–1310.

 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 (corresponding author), R. W. Straub, R. T. Villanueva, J. F. Walgenbach. 2009. Reduced-Risk Pest Management Programs for Eastern U.S. Apple and Peach Orchards: A 4-Year Regional Project.  Am. Ent. 55(3): 184-197.

 Nielsen, A.L., P. Shearer, and G.C. Hamilton. 2008. Toxicity of Insecticides to Halyomorpha halys (Hemiptera: Pentatomidae) using a Glass-Vial Bioassay. J. Econ. Entomol. 101(4): 1439-1442.

 Krimian, A., P. W. Shearer, Aijun Zhang, G. C. Hamilton and J. Aldrich. 2008.  Field trapping of invasive brown marmorated stink bug, Halyomorpha halys, with geometric isomers of methyl 2,4,6-decatrienoate. J. Agric. Food Chem. 56: 197–203.

 Aldrich. J. R., A. Khrimian, A. Zhang, and P. W. Shearer. 2006. Bug pheromones (Hemiptera: Heteroptera) and tachinid fly host-finding. Denesia. 19:1015-1031.

 Atanassov, A. and P. W. Shearer. 2006.  Peach extrafloral nectar impacts life span and reproduction of adult Grapholita molesta (Busck) (Lepidoptera: Tortricidae). Journal of Agricultural and Urban Entomology. 22 (1): 41-47.

 Lalancette, N., R. D. Belding, P. W. Shearer, J. L Frecon, and W. H. Tietjen.  2005. Evaluation of hydrophobic and hydrophilic kaolin particle films for peach crop, arthropod, and disease management. Pest Mgt. Sci. 61:25–39.

 Shearer, P. W. and A. Atanassov. 2004. Impact of peach extrafloral nectar on key biological characteristics of Trichogramma minutum Riley (Hymenoptera: Trichogrammatidae). J. Econ. Entomol. 97: 789-792.

 Atanassov, A., P. W. Shearer, and G. C. Hamilton. 2003. Peach pest management programs impact beneficial fauna abundance and Grapholita molesta (Lepidoptera: Tortricidae) egg parasitism and predation. Environ. Entomol. 32: 780-788.

 Atanassov, A., P. W. Shearer, G. Hamilton, and D. Polk. 2002.  Development and implementation of a reduced risk peach arthropod management program in New Jersey orchards. J. Econ. Entomol. 95: 803-812.

 Shearer, P. W. and J. L. Frecon. 2002. Managing Brachycaudus persicae (Homoptera: Aphididae) during peach orchard establishment.  J. Econ. Entomol.  95: 368-371.

 de Lame, F. M., J. J. Hong, P. W. Shearer, and L B. Brattsten. 2001. Sex related differences in the resistance of Oriental fruit moth (Grapholita molesta) to organophosphate insecticides. Pest Mgt. Sci. 57: 822-832.