Professor and Extension Specialist
Office: C201 Plant Sciences
Lab: E202 Plant Sciences
I have broad research interests related to Integrated Pest Management of all arthropods affecting horticultural commodities in Colorado, particularly vegetables, shade trees, turfgrass and specialty crops. Research efforts also are designed to be flexible enough to respond to new insect/mite problems that do affect horticultural crops or cause significant nuisance problems in Colorado. Primary research subject species in the past two years include Japanese beetle, neonicotinoid resistant European elm scale, emerald ash borer, Mexican bean beetle, pin oak kermes and drippy blight disease of oak. In addition, since 2015, there has been a large project to identify and respond to the insect pest management needs of industrial hemp.
Extension responsibilities primarily involve outreach activities related to diagnosis and management of insect pests of horticultural crops in Colorado. Shared Extension responsibilities (with others in Department) also extend to management of household insects and general entomological inquiries. The Insect Information Website consolidates much of the material used in Extension programing. The more recently developed Hemp Insect Website provides information related to studies on insect pest management of hemp.
Students Presently Advised:
Rasha Al-Akeel – Ph.D. in Entomology
Andrew Miller – M.S. in Entomology
Courses Presently Taught:
BSPM102 Insects, Science and Society (Fall semester)
BSPM303B Horticultural Entomology Lab (3 sections) (Fall semester)
BSPM356A Horticultural Entomology – Fundamentals (online, Fall/Spring semester)
BSPM356B Horticultural Entomology – Food Crops (online, Fall/Spring semester)
BSPM356C Horticultural Entomology – Turf and Ornamentals (online, Fall/Spring semester)
Selected Recent Research Publications:
Cranshaw, W., M. Schreiner, K. Britt, T. P. Kuhar, J. McPartland, and J. Grant. 2019. Developing Insect Pest Management Systems for Hemp in the United States: A Work in Progress. Journal of Integrated Pest Management. Volume 10, Issue 1, 2019, 26, https://doi.org/10.1093/jipm/pmz023 Published 28 August, 2019.
Giladi, Y., L. Hadad, N. Luria, W.Cranshaw, O. Lachman, and A. Dombrovsky. 2019. First Report of Beet Curly Top Virus Infecting Cannabis sativa L., in Western Colorado. Plant Disease Published Online: 11 Nov 2019 https://doi.org/10.1094/PDIS-08-19-1656-PDN
Cranshaw, W., P. Forrence, and B. Kondratieff. 2019. Observations on development of Diogmites angustipennis Loew (Diptera: Asilidae) in a cultivated field. J. Kansas Entomol. Soc. 92(1): 412-414.
Cranshaw, W.S. and K. Due. 2018. A Survey of the cluster flies found in buildings in Colorado. Southwestern Entomologist 43(1):263-265 https://doi.org/10.3958/059.043.0117
Sitz, R. A., M. M. Zerillo, J. W. Snelling, J. I. Caballero, K. Alexander, K. Nash, N. A. Tisserat, W. S. Cranshaw, and J. E. Stewart. 2018. Drippy blight, a disease of red oaks in Colorado, U.S., produced from the combined effect of the scale insect Allokermes galliformis and the bacterium Lonsdalea quercina subsp. quercina. Arboriculture and Urban Forestry, 44(3), 146-152.
Cranshaw, W. S., S. E. Halbert, C. Favret, K. E. Britt, and G. L. Miller. 2018. Phorodon cannabis Passerini (Hemiptera: Aphididae), a newly recognized pest in North America found on industrial hemp. Insecta Mundi 0662: 1-12.
Sitz, R.A., Luna, E.K., Tisserat, N.A., Caballero, J.I., Cranshaw, W.S. and J.E. Stewart. 2017. Virulence of genetically distinct Geosmithia morbida isolates to black walnut and their response to co-inoculation with Fusarium solani. Plant Dis. 101(1):116-120. https://doi.org/10.1094/PDIS-04-16-0535-RE
Cranshaw, W. and D. Shetlar. 2017. Garden Insects of North America, 2nd Edition. Princeton University Press. Princeton, N.J. 704 pp.
Zerillo, M.M.., J. I. Caballero, K. Woeste, A. D. Graves, C. Hartel, J W. Pscheidt, J. Tonos, K. Broders, W. Cranshaw, S. J. Seybold, N. Tisserat. 2014. Population structure of Geosmithia morbida, the causal agent of thousand cankers disease of walnut trees in the United States. PLoS One Published: November 13, 2014. DOI: 10.1371/journal.pone.0112847
McEwen, C., S. Digweed, J.A. Nicholls and W. Cranshaw. 2014. Description and biology of the sexual generation of Disholcaspis quercusmammma (Walsh and Riley) (Hymenoptera: Cynipidae), with notes on associated parasitoids. Proceedings of the Entomological Society of Washington 116(3):294-310. doi: http://dx.doi.org/10.4289/0013-87184.108.40.2064
Cranshaw, W., W. Jacobi, D. Leatherman, and N. Tisserat. 2014. Insects and Diseases of Woody Plants in Colorado. Colorado State University Extension Bulletin 506A. 322 pp.
Cranshaw, W. and R. Redak. 2013. Bugs Rule! An Introduction to the World of Insects. Princeton University Press. Princeton, N.J. 480 pp.