Department of Entomology


Marshall W. Johnsonucr entomology

Extension Specialist and Entomologist Emeritus

Location: UC Kearney Agricultural Research & Extension Center
9240 S. Riverbend Ave., Parlier, CA 93648

Tel: (559) 360-4320
E-mail: marshall.johnson@ucr.edu


2012 - Distinguished Scientist of the Year Award, International Organization for Biological Control, NRS

2010 - UC Riverside Alumni Assoc. Resolution honoring distinguished contributions to biocontrol & IPM

2010 - Award for Excellence in Research, Western Assoc. of Agricultural Experiment Station Directors

2008 - Elected Fellow, American Association for the Advancement of Science

2006 - Elected Fellow, Entomological Society of America

1996 - C. W. Woodworth Award, Pacific Branch of the Entomological Society of America

1992 - Entomological Society of America Recognition Award for Contributions to Agriculture

1992 - UH Regents' Medal for Excellence in Research, University of Hawaii at Manoa, Honolulu

Research Area

My main research interest is in the development of integrated pest management (IPM) programs for arthropods with the goal of reducing dependence on conventional pesticides that pose risks to human health and the environment. When feasible, I prefer to employ biological control by natural enemies. Over the last decade, my focus has been on pest problems in perennial tree crops and vineyards in California’s Central Valley. These pests included several phytophagous species, each posing a different crop injury risk and management challenge. These are olive fruit fly, Bactrocera oleae (Rossi) (Diptera: Tephritidae); glassy-winged sharpshooter, Homalodisca vitripennis (formerly coagulata) (Germar) (Hemiptera: Cicadellidae); tenlined June beetle, Polyphylla decemlineata (Say) (Coleoptera: Scarabaeidae); oriental fruit moth, Grapholita molesta (Busck) (Lepidoptera: Tortricidae); and olive psyllid, Euphyllura olivina (Costa) (Heteroptera: Psyllidae). All of these species are invasive except for tenlined June beetle, which appears to be native to the western USA and Canada. To develop effective and sustainable control tactics, it is important to have a good understanding of the ecology of each pest species within the geographical habitats they occupy.


Daane, K. M., X. Wang, D. J Nieto, C. H. Pickett, K. A. Hoelmer, A. Blanchet, and M. W Johnson.  2015. Classic biological control of olive fruit fly in California, USA: release and recovery of introduced parasitoids.  Biocontrol 60: 317-330.

Krugner, R., M. S. Sisterson, J. C. Chen, D. C. Stenger, and M. W. Johnson. 2014. Evaluation of olive as a host of Xylella fastidiosa and associated sharpshooter vectors. Plant Disease: 98: 1186-1193.

Johnson, M. W., X.-G. Wang, H. Nadel, S. B. Opp, K. Lynn-Patterson, J. Stewart-Leslie, and K. M. Daane.  2011. High temperature impacts on olive fruit fly populations in California’s Central Valley. California Agriculture 65(1): 29-33.

Daane, K. M., and M. W. Johnson. 2010. Olive fruit fly: Managing an ancient pest in modern times. Annual Review of Entomology 55: 151-69.

Wang, X.-G., H. Nadel, M.l W Johnson, K. M Daane, K. Hoelmer, V. M Walton, C. H Pickett, and K. R Sime.  2009.  Crop domestication relaxes both top-down and bottom-up effects on a specialist herbivore.  Basic and Applied Ecol. 10: 216-227.

Pandey, R. R., and M. W. Johnson. 2006. Enhanced production of pink pineapple mealybug, Dysmicoccus brevipes (Cockerell), (Hemiptera: Pseudococcidae). Biocontrol Science and Technology 16: 389-401.

Hooks, C. R. R., R. R. Pandey, and M. W. Johnson. 2006. Effects of spider presence on Artogeia rapae and host plant biomass. Agriculture, Ecosystems and Environment 112: 73-77.

Johnson, M. W. 2005. Our war with the insects: Analysis of lost battles. pp. 207-223. In K. M. Heinz, R. Frisbie & C. Bográn, (eds.), Entomology at the Land Grant University: Perspectives from the Texas A&M University Department Centenary, Texas A&M Press, College Station, TX. 341 pp.

Johnson, M. W., N. C. Toscano, H. Costa, and John Palumbo. 2004. Integrated Pest Management in vegetables and ornamentals in the Western United States. In: Novel Approaches to Pest Management. (A. R. Horowitz and I. Ishaaya, eds.). Springer-Verlag, Heidelberg, Germany. pp. 279-299.

Hooks, C. R. R. & M. W. Johnson. 2003. Impact of agricultural diversification on the insect community of cruciferous crops. Crop Protection 22: 223-238.

Rohrbach, K. G., and M. W. Johnson. 2003. Pests, diseases and weeds. pp. 203-251. In The Pineapple: Botany, Production and Uses, CABI Publishing, NY, CAB International, UK (D. Bartholomew, R. E. Paull & K. G. Rohrbach, eds.). 301 pp.

Johnson, M. W., and B. E. Tabashnik. 1999. Enhanced biological control through pesticide selectivity. pp. 297–317. In: Handbook of Biological Control, Academic Press, San Diego. (T. Fisher, T. S. Bellows, L. E. Caltagirone, D. L. Dahlsten, Carl Huffaker, and G. Gordh, eds.). 1046 pp.

Gonzalez-Hernandez, H., M. W. Johnson, and N. J. Reimer. 1999. Impact of Pheidole megacephala (F.) (Hymenoptera: Formicidae) on the biological control of Dysmicoccus brevipes (Cockerell) (Homoptera: Pseudococcidae). Biological Control 15: 145–152.

Johnson, M. W., and B. E. Tabashnik. 1994. Laboratory selection for pesticide resistance in natural enemies. pp. 91-105. In: Applications of Genetics to Arthropods of Biological Control Significance (S. K. Narang, A. C. Bartlett, R. M. Faust, eds.). CRC Press, Inc., Boca Raton, FL. 199 pp.

Tabashnik, B. E., N. L. Cushing, N. Finson, and M. W. Johnson. 1990. Field development of resistance to Bacillus thuringiensis in diamondback moth (Lepidoptera: Plutellidae). J. Econ. Entomol. 83: 1671-1676.

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

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Dept of Entomology Information

417 Entomology Bldg.

Fax: (951) 827-3086
Prospective Grad Students: (800) 735-0717
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