Department of Entomology


John Trumbleentomology

Distinguished Professor of Entomology

Location: Entomology 224

Tel: (951) 827-5624
E-mail: john.trumble@ucr.edu

Research Specialization

Our research interests are rather broad, covering both basic and applied problems in agricultural and natural ecosystems. We are very interested in how plant-herbivore interactions are influenced by anthropogenic pollution of air (ozone, acidic precipitation) and water (heavy metals and metalloids). As part of this work, we are investigating how increasing concentrations of contaminants impact plant physiology, and how any resulting chemical or growth changes may impact insect development and behavior. We are also interested in how pollutants will change gene expression and defensive chemical production in genetically modified plants. These studies on plant physiology have stimulated additional interests in how and when plants can compensate for insect damage. Although initially of a basic physiological nature, most of this work ultimately finds practical application in economic threshold development, IPM, and natural ecosystem management.


BS Entomology & Applied Ecology 1974
University of Delaware
MS Entomology 1977
Virginia Tech
PhD Entomology 1980
Virginia Tech


2014: National Institute of Food and Agriculture Partnership Award for Mission Integration of Research, Extension, and Education
2013: Oscar Lorenz Award
2012: Texas A&M Award in Excellence
2012 -Entomological Society of America Integrated Pest Management Team Award
2009 - The G. P. Scutter Lecturer for the Univ. of British Columbia
2007 - Outstanding Entomology Alumnus, Virginia Tech
2004 - Fellow, American Association for the Advancement of Science
2003 - Entomological Society of America Research Recognition Award
2001-present - Editor in Chief, Journal of Economic Entomology
1998 - Fellow, Entomological Society of America
1994-1995 - President, Pacific Branch of the Entomological Society of America
1994 - University of Delaware Presidential Citation for Outstanding Achievement
1993 - Bussart Award for Excellence in Integrated Pest Management, Entomological Society of America



Di, N., K. R. Hladun, K. Zhang, T.-X. Liu, and J. T. Trumble. 2016. Laboratory bioassays on the impact of cadmium, copper and lead on the development and survival of honeybee (Apis mellifera L.) larvae and foragers. Chemosphere (in press).

Prager, S. M., G. Kund and J.T. Trumble. 2016. IPM guidelines for the management of potato psyllids, a pest of numerous solanaceous vegetable crops in California. Calif. Agric. (In press).

Pennington, M.J., S.M. Prager, W.E. Walton, and J.T. Trumble. 2016. (Culex quinquefasciatus) larval microbiomes vary with instar and exposure to common wastewater contaminants. Nature Scientific Reports 6:21969 | DOI: 10.1038/srep21969.

Burden, C. M., C. Elmore, K. R. Hladun, J. T. Trumble, and B. H. Smith. 2016. Acute exposure to selenium disrupts associative conditioning and long-term memory recall in honey bees (Apis mellifera L.). Ecotoxicology and Environmental Safety 127: 71–79.

Hladun, K.R., N. Di, T.-X. Liu, and J.T. Trumble. 2016. Metal contaminant accumulation in the hive: consequences for whole colony health and brood production in the honey bee (Apis mellifera L.). Environmental Toxicology and Chemistry. 35: 322-329.

Wu F, Deng X, Liang G, Wallis C, Trumble JT, Prager S, Chen J. 2015. De novo genome sequence of "Candidatus Liberibacter solanacearum” from a single potato psyllid in California. Genome Announc 3(6):e01500-15. doi:10.1128/genomeA.01500-15.

Rubio-Covarrubias, O.A., M.A. Cadena-Hinojosa, R. Flores-López, J.E. Munyaneza, S. M. Prager and J. T. Trumble. 2015.  Assessing zebra chip resistance of advanced potato clones under field conditions in the Toluca valley, Mexico.  Revista Latinoamericana de la Papa 19: 20-30 

Pennington, M. J., N. G. Rivas, S. M. Prager, W. E. Walton, and J. T. Trumble. 2015. Pharmaceuticals and personal care products alter the holobiome and development of a medically important mosquito. Environmental Pollution 203:199-207.

Prager, S. M., C. Wallis, and J.T. Trumble. 2015. Indirect effects of one plant pathogen on the transmission of a second pathogen and the behavior of its potato psyllid vector. Environmental Entomology. In Press.

Hladun, K.R., D. R. Parker, and J. T. Trumble. 2015. Cadmium, copper and lead accumulation and bioconcentration in the vegetative and reproductive organs of Raphanus sativus: Implications for plant function and pollination.  Journal of Chemical Ecology DOI 10.1007/s10886-015-0569-7.

De La Riva, D. G., B. G. Vindiola, T. N. Castañeda, D. R. Parker and J. T. Trumble. 2014. Impact of selenium on mortality, bioaccumulation and feeding deterrence in the invasive Argentine ant, Linepithema humile (Hymenoptera: Formicidae). Science of the Total Environment 481: 446-452.

Prager, S.M., C. D. Butler, and J. T. Trumble. 2014. A binomial sequential sampling plan for the psyllid Bactericera cockerelli Sulc (Hemiptera: Triozidae) in tomato (Solanum lycopersicum). Journal of Economic Entomology 107: 838-845.

Arp, A, J. E. Munyaneza, J. M. Crosslin, J T. Trumble, and B. Bextine. 2014. A global comparison of Bactericera cockerelli (Hemiptera: Triozidae) microbial communities. Environmental Entomology 43: 344-352.

Prager, S. M., I. Esquivel and J. T. Trumble. 2014. Factors influencing host plant choice performance in Bactericera cockerelli. PLoS ONE: 9(4): e94047. doi:10.1371/journal.

Diaz-Montano J., B. G. Vindiola, N. Drew, R. G. Novy, J. C. Miller Jr., and J. T. Trumble. 2013. Resistance of selected potato genotypes to the potato psyllid (Hemiptera: Triozidae). American Journal of Potato Research. DOI 10.1007/s12230-013-9356-6.

Hladun, K.R., O. Kaftanoglu, D. Parker, K. Tran, and J. T. Trumble. 2013. Effects of selenium on development, survival and accumulation in the honey bee (Aphis mellifera L.). Environmental Toxicology and Chemistry 32: 2584-2592.

Mogren, C.L., W.E. Walton, and J.T, Trumble. 2013. Tolerance to individual and joint effects of arsenic and Bacillus thuringiensis subsp. israelensis or Lysinibacillus sphaericus in Culex mosquitoes. Insect Science. DOI: 10.1111/1744-7917.12046.

Prager, S.M., B. Vindiola, G. S. Kund, F. J. Byrne, and J. T. Trumble 2013. Considerations for the use of neonicotinoid pesticides in management of Bactericera cockerelli (Sulk) (Hemiptera: Triozidae). Crop Protection 54: 84-91.

Mogren, C.L., W. E. Walton, D. Parker, and J. T. Trumble. 2013. Trophic transfer as a route of arsenic movement from aquatic to terrestrial environments. PLOS ONE 8(6) e67817. doi:10.1371/journal.pone.0067817.

Mogren, C. L., S. Webb, W.E. Walton and J.T. Trumble. 2013. Micro x-ray absorption spectroscopic analysis of arsenic localization and biotransformation in Chironomus riparius Meigen (Diptera: Chironomidae) and Culex tarsalis Coquillett (Culicidae). Environmental Pollution 180: 78-83.  

Prager, S. M. , C. D. Butler, and J. T. Trumble. 2013. A sequential binomial sampling plan for potato psyllid (Hemiptera: Triozidae) on bell pepper (Capsicum annum). Pest Management Science DOI: 10.1002/ps.3475.

Hladun, K. R., D. R. Parker, K. D. Tran, and J. T. Trumble. 2013. Effects of selenium accumulation on phytotoxicity, herbivory, and pollination ecology in radish (Raphanus sativus L.). Environmental Pollution 172: 70-75.

Diaz-Montano, J. and J. T. Trumble. 2012. Behavioral Responses of the potato psyllid (Hemiptera: Triozidae) to volatiles from dimethyl disulfide and plant essential oils. Journal of Insect Behavior. DOI: 10.1007/s10905-012-9350-8.

Butler, C.D. and J. T . Trumble. 2012. Identification and impact of natural enemies of Bactericera cockerelli in southern California. Journal of Econiomic Entomology 105: 1509-1519.

Liu, T., Y. Zhang, L. Peng, P. Rojas,and  J.T.Trumble. 2012. Risk Assessment of Selected Insecticides on Tamarixia triozae (Hymenoptera: Eulophidae), a Parasitoid of Bactericera cockerelli (Hemiptera: Trizoidae). Journal of Economic Entomology 105: 490-496.

Mogren, C.L., G. R. von Kiparski, D. Parker, and J. T.Trumble. 2012. Survival, reproduction, and arsenic body burdens in Chironomus riparius exposed to arsenate and phosphate. Science of the Total Environment  425: 60-65.

Hladun, K.R., B. H. Smith, J. Mustard, J. T. Trumble. 2012. Selenium toxicity to honey bee (Apis mellifera L.) pollinators: Effects on behaviors and survival. PLoS One. 7:334137; doi:10.1371/journal.pone.0034137.

Butler, C.D., and J. T. Trumble. 2012. Spatial dispersion and binomial sequential sampling for the potato psyllid (Hemiptera: Triozidae) on potato. Pest Management Science. 68: 865-869.

Butler, C.D., G.P. Walker and J.T. Trumble. 2012. Feeding disruption of potato psyllid, Bactericera cockerelli, by imidacloprid as measured by electrical penetration graphs. Entomologia Experimentalis et applicata 142:247-257.

Butler, C.D., and J. T. Trumble. 2012. Bactericera cockerelli (Sulc) (Hemiptera: Triozidae): life history, relationship to plant diseases, and management strategies. Terrestrial Arthropod Reviews 5: 87-111.

Butler, C.D., B. Gonzalez, K. Manjunath, R.F. Lee, R.G. Novy, C. Miller Jr., and J.T. Trumble. 2011. Behavioral responses of adult potato psyllid, Bactericera cockerelli (Hemiptera: Triozidae), to potato germplasm and transmission of Candidatus Liberibacter psyllaurous. Crop Protection 30: 1233-1238.

Butler, C.D. and J. T. Trumble. 2011. New records of hyperparasitism of Tamarixia triozae (Burks) by Encarsia spp. in California. Pan Pacific Entomologist. 87: 130-133.

Hladun, K. R., D. R. Parker and J. T. Trumble. 2011. Selenium accumulation in the floral tissues of two Brassicaceae species and its impact on floral traits and plant performance. Environmental and Expt. Botany 74: 90-97.

Peng, L. J. T. Trumble, J.E. Munyaneza, abd T.-X. Liu. 2011. Repellency of a kaolin particle film to tomato psyllid, Bactericera cockerelli (Homoptera: Psyllidae) on tomato under laboratory and field conditions. Pest Management Science 67: 815-824.

Butler, C. D., F. J. Byrne, M. L. Keremane, Richard F. Lee, and J. T. Trumble. 2011.  Effects of Insecticides on Behavior of Adult Bactericera cockerelli (Hemiptera: Triozidae) and Transmission of Candidatus Liberibacter psyllaurous. J. Economic Entomology 104: 586-594.

Mogren, C.L. and Trumble, J.T. 2010. The Impacts of Metals and Metalloids on Insect Behavior. Entomologia Experimentalis et Applicata 135: 1-17.

Butler, C. D., and J. T. Trumble. 2010. Predicting population dynamics of the parasitoid Cotesia marginiventris (Cresson) (Hymenoptera: Braconidae) resulting from novel interactions of temperature and selenium. Biocontrol Science and Technology 20: 391-406.

Yang, X.-B., Y.-M. Zhang, L. Hua, L.-N. Peng, J.E. Munyaneza, J.T. Trumble, and T.-X. Liu. 2010. Repellency of selected biorational insecticides to potato psyllid, Bactericera cockerelli (Hemiptera: Psyllidae).  Crop Protection 29: 1320-1324.

Jeske, J. R., H. K. Xu, T. Blessinger, P. Jensen and J.T. Trumble. 2009. Testing for the equality of EC50 values in the presence of unequal slopes with application to toxicity of selenium types. Journal of Agricultural, Biological and Environmental Statistics 14: 469-483.

Butler, C.D., N.E. Beckage, and J.T. Trumble. 2009. Effects of terrestrial pollutants on insect parasitoids. Environmental Toxicology and Chemistry 28: 1111–1119.

Trumble, J. T. and C. D. Butler. 2009. Climate change will exacerbate California's insect pest problems. California Agriculture 64:73-78.

Sorensen, M. A. C. M. Chase-Dunn and J. T. Trumble. 2009. Chronic exposure to elevated levels of manganese and nickel is tolerated by a cosmopolitan detritivore, Megaselia scalaris (Loew) (Diptera: Phoridae). Insect Science 16:73-79.

Liu, T.X., L. Kang, K. Heinz, and J.T. Trumble. 2009. Biological control of Liriomyza leafminers: Progress and prospects. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources 4,16 pp.

Sorensen, M. A., D. Parker and J. T. Trumble. 2009. Pollutant accumulation by the invasive weed saltcedar (Tamarix ramosissima) and transfer to the biological control agent Diorhabda elongate (Coleoptera: Chrysomelidae). Environmental Pollution 157: 384-391.

Hansen, A.H., J. T. Trumble, R. Stouthamer, and T.D. Paine. 2008. New Huanglongbing (HLB) Candidatus species, C. Liberibacter psyllaurous, found to infect tomato and potato is vectored by the psyllid Bactericerca cockerelli (Sulc). Applied and Environmental Microbiology 74: 5862-5865.

Trumble, J. T. and M. A. Sorensen. 2008. Selenium and the elemental defense hypothesis. New Phytologist 177: 569–572.

Butler, C.D. and J. T. Trumble. 2008. Effects of pollutants on bottom-up and top-down processes in insect-plant interactions. Environmental Pollution 156: 1-10.

Sorensen, M. A., W. E. Walton, and J. T. Trumble. 2007. Impact of the inorganic pollutants perchlorate and hexavalent chromium on the efficacy of Bacillus sphaericus and Bacillus thuringiensis subsp. israelensis against Culex quinquefasciatus. J. Medical Entomology 44: 811-816

Liu, D. and J. T. Trumble. 2007. Comparative fitness of invasive and native populations of the potato psyllid (Bactericera cockerelli). Entomologica Experimentalis et applicata 123:35-42.

Jensen, P. D. M. A. Sorensen, W. E. Walton, and J. T. Trumble. 2007. Lethal and sublethal responses of an aquatic insect Culex quinquefasciatus (Diptera: Culicidae) challenged with individual and joint exposure to dissolved sodium selenate and methyl mercury chloride. Environmental Toxicology 22:287-294.

Luo, K., J.T. Trumble, and Y. Pang. 2007. Life history of Microplitis bicoloratus on Spodoptera litura and implications for biological control. BioControl. 52:309-321.

Sorensen, M.A., P.D. Jensen, W.E. Walton and J.T. Trumble. 2006. Acute and chronic activity of perchlorate and hexavalent chromium contamination on the survival and development of Culex quinquefasicatus Say (Diptera: Culicidae). Environmental Pollution 144:759-764.

Liu, D. and J.T. Trumble. 2006. Differential responses to feeding by the tomato/potato psyllid between two tomato cultivars and their implications in establishment of injury levels and potential of damaged plant recovery. Insect Science 13: 195-204

Liu, D. and J.T. Trumble. 2006. Ovipositional preferences, damage thresholds and detection of the tomato / potato psyllid (Bactericera cockerelli [Sulc]) on selected tomato acessions. Bulletin of Entomological Research. 96:197-204.

Liu, D., J.T. Trumble and R. Stouthamer. 2006. Genetic differentiation between eastern populations and recent introductions of potato psyllid (Bactericera cockerelli) into western North America. Entomologia Experimentalis et Applicata. 118: 177-183.

Jensen, P.D., L. Johnson, and J.T. Trumble. 2006. Individual and joint action of selenate and methylmercury on the development and survival of an insect detritivore Megaselia scalaris (Diptera: Phoridae). Archives of Environ. Contamination 49: 1-9.

Jensen, P. D., M Arias, and J. T. Trumble. 2005. Toxicological and developmental responses of a terrestrial insect detritivore, Megaselia scalaris (Loew) to four selenium species. Ecotoxicology 14: 311-320.

Liu, D. and J.T. Trumble. 2005. Interactions of plant resistance and insecticides on the development and survival of Bactericerca cockerelli [Sulc] (Homoptera: Psyllidae). Crop Protection 24: 111-117.

Sorensen, M. A. and J. T. Trumble. 2004. Bioavailability and bioremediation of perchlorate salts. pp 349-363. In: Bodari, Editor, Recent Research Developments in Environmental Biology. Trivandum, India.

Vickerman, D., J. T. Trumble, G. George, I. Pickering, H. Nichol. 2004. Selenium biotransformations in an insect ecosystem: Effects of insects on phytoremediation. Environmental Science & Technology 38: 3581-3586.

Liu, D. and J. T. Trumble. 2004. Tomato psyllid behavioral responses to tomato plant lines and interactions of plant lines with insecticides. J. of Economic Entomology. 97: 1078-1085.

Trumble, J. T. and D. Vickerman. 2004. Impact of pollution on terrestrial arthropods. In: (J. Capinera, Ed.), Encyclopedia of Entomology. Pp. 170-173. Kluwer Academic Press.

Trumble, J. T. and P. D. Jensen. 2004. Ovipositional response, developmental effects and toxicity of hexavalent chromium to Megaselia scalaris, a terrestrial detritivore. Archives of Environmental Contamination and Toxicology 46: 372-376.

Vickerman, D. B. and J.T. Trumble. 2003. Biotransfer of selenium: Effects on an insect predator, Podisus maculiventris. Ecotoxicology 12: 497-504.

Jensen, P. D. and J. T. Trumble. 2003. Ecological consequences of bioavailability of metals and metalloids in insects. Pages 1-17. In Bondari, K. Editor, Recent Developments in Entomology, Research Signpost, Trivandrum.

Vickerman, D. B., J. Young, and J.T. Trumble. 2002. Effect of selenium treated alfalfa on development, survival, feeding and oviposition preferences of Spodoptera exigua (Lepidoptera: Noctuidae). Environmental Entomology 31: 953-959.

Banuelos, G. S., D. B. Vickerman, J. T. Trumble, M. C. Shannon, C. D. Davis, J. W. Finley, and H. F. Mayland. 2002. Biotransfer possibilities of selenium form plants used for phytoremediation. J. of Phytoremediation 4: 315-329.

Rodriguez-Saona, C., J. Millar and J. T. Trumble. 2002. Idioblast oil cells as a source for new botanical products with biological activity. pp. 115-132, In: Produits Naturels d’origineVégétale. (C. Regnault-Roger, B. Philogène and C.Vincent, eds.) Lavoisier, Paris.

Vickerman, D. B., M.C. Shannon, G.S., Bañuelos, C.M. Grieve, and J.T. Trumble. 2002. Evaluation of Atriplex lines for selenium accumulation, salt tolerance and suitability for a key agricultural insect pest. Environmental Pollution. 120: 463-473.

Reitz, S. J. and J. T. Trumble. 2002. Interspecific and intraspecific variation in two Liriomyza leafminer species in California. Entomologia Experimentalis et Applicata. 102: 101-113.

Reitz, S. R. and J. T. Trumble. 2002. Competitive displacement among insects and arachnids. Annual Review Entomology 47: 435-465.

Trumble, J. T. 2002. Caveat Emptor: Safety considerations for natural products used in arthropod control. American Entomologist 48: 7-13.

Coviella, C., R. D. Stipanovic and J. T. Trumble. 2001. Plant allocation to defensive compounds in elevated atmospheric CO2 and mechanisms of plant resistance to herbivorous insects. Experimental Botany 53: 323-331.

Rodriguez-Saona, C. and J. T. Trumble. 2000. Biologically active aliphatic acetogenins from specialized idioblast oil cells. Current Organic Chemistry 4:1249-1260.

Morgan, D. J. W., S. R. Reitz, P. W. Atkinson and J. T.Trumble. 2000. The resolution of Californian populations of Liriomyza huidobrensis and Liriomyza trifolii (Diptera:Agromyzidae) using PCR. Heredity 85: 53-61.

Coviella, C. and J. T. Trumble. 2000. Effect of elevated atmospheric carbon dioxide on the use of foliar application of Bacillus thuringiensis. Biocontrol 45: 325-336.

Rodriguez-Saona, C. and J. T. Trumble. 2000. Secretory idioblast oil cells: evidence of their defensive role against non-adapted insect herbivores. Entomologia Experimentalis et Applicata 94: 183-194.

Coviella, C.,D. J. W. Morgan and J. T. Trumble. 2000. Interactions of elevated CO2 and nitrogen fertilization: Effects on the production of Bacillus thuringiensis toxins in transgenic plants. Environmental Entomology 29: 781-787.

Rodriguez-Saona, C., D. F. Maynard, S. Phillips and J. T. Trumble. 2000. Avocadofurans and their tetrahydrofuran analogs: comparison of growth inhibitory and insecticidal activity. Journal of Food and Agricultural Chemistry 48: 3642-3645.

Trumble, J.T., M. M. Diawara and C. F. Quiros. 1999. Breeding resistance in Apium graveolens to Liriomyza trifolii : Antibiosis and linear furanocoumarin content. ActaHorticulturae 513: 29-38.

Vickerman, D. and J. T. Trumble. 1999. Feeding preferences of Spodoptera exigua in response to form and concentration of selenium. Archives of Insect Biochemistry and Physiology 42: 64-73.

Reitz, S. R., G. S. Kund, W. G. Carson, P. A. Phillips, and J. T. Trumble. 1999. Economics of reducing insecticide use on celery through low input management strategies. Agriculture, Ecosystems And Environment 73:185-197.

Coviella, C. and J. T. Trumble. 1999. Affects of Elevated Atmospheric Carbon Dioxide on Insect-Plant Interactions: Implications for Insect Conservation. Conservation Biology 13: 700-712.

Rodriguez-Saona, C. and J. T. Trumble. 1999. Effect of avocadofurans on the larval feeding behavior of the generalist herbivore, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae). Entomol. Exp. Appl. 90: 131-140.

Gelernter, W.D. and J. T. Trumble. 1999. Factors in the success and failure of microbial insecticides in vegetable crops. Integrated Pest Management Reviews 4: 301-306.

Rodriguez-Saona, C., D. F. Maynard, S. Phillips, and J. T. Trumble. 1999. Alkylfurans: Effects of alkyl side-chain length on insecticidal activity. J. Natural Products 62: 191-193.

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