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 2017 included Japanese beetle, neonicotinoid resistant European elm scale, emerald ash borer, brassica pests, pin oak kermes and drippy blight disease of oak. A new project started in the year was to describe the insect/mite pests of hemp and identify pest management needs.
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 http://bspm.agsci.colostate.edu/outreach-button/insect-information/ consolidates much of the material used in Extension programing.
Rashsa Al-Akeel – PhD in Entomology
Zach Longtine – MS in Entomology
Melissa Schreiner – MS in Entomology
Rachael Sitz – PhD in Plant Pathology
BSPM102 Insects, Science and Society (Fall semester)
BSPM303B Horticultural Entomology Lab (3 sections) (Fall semester)
BSPM356A Horticultural Entomology – Fundamentals (online, Spring semester)
BSPM356B Horticultural Entomology – Food Crops (online, Spring semester)
BSPM356C Horticultural Entomology – Turf and Ornamentals (online, Spring semester)
Cranshaw, W. and D. Shetlar. 2017. Garden Insects of North America, 2nd Edition. Princeton University Press. Princeton, N.J. 704 pp.
Sitz, R.A., Zerillo, M.M., Snelling, J., Caballero, J.I., Alexander, K., Nash, K., Tisserat, N.A., Cranshaw, W.S., and J.E. Stewart. 2017. Drippy blight disease of red oaks in Colorado caused by Allokermes sp. and Lonsdalea quercina subsp. quercina. Arboriculture and Urban Forestry (in press)
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) (Hyemoptera: Cynipidae), with notes on associated parasitoids. Proceedings of the Entomological Society of Washington 116(3):294-310. doi: http://dx.doi.org/10.4289/0013-87126.96.36.1994
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.
Sever, A., W. Cranshaw and R. Brudenell. 2012. Agrilus quercicola (Fisher) (Coleoptera: Buprestidae), the Gambel oak borer, as a pest of Quercus spp. Southwestern Entomologist 37(2):147- 150. doi: http://dx.doi.org/10.3958/059.037.0207
Looney, C., L. M. Humble and W. Cranshaw. 2012. Orchestes alni (L.) (Coleoptera: Curculionidae): New Records from Western North America with Notes on Parasitoids. The Coleopterist’s Bulletin 66(1):63-66. doi: http://dx.doi.org/10.1649/072.066.0115
Cranshaw, W.S., H.J. Larsen, Jr. and R.J. Zimmerman. 2011. Notes on fruit damage by the European paper wasp, Polistes dominula (Christ) (Hymenoptera: Vespidae). Southwestern Entomologist 36(1): 103-105. doi: http://dx.doi.org/10.3958/059.036.0110
Cranshaw, W. 2011. Recently recognized range extensions of the walnut twig beetle, Pityophthorus juglandis Blackman (Coleoptera: Curculionidae: Scolytinae), in the western United States. The Coleopterists Bulletin 65(1) 48-49. doi: http://dx.doi.org/10.1649/0010-065X-65.1.48
Cranshaw, W. 2011. A Review of Nuisance Invader Household Pests of the United States. American Entomologist 57(3): 165-169.
Tisserat, N., Cranshaw, W., Putnam, M. L., Pscheidt, J., Leslie, C. A., Murray, M., Hoffman, J., Barkley, Y., Alexander, K., and Seybold, S. J. 2011. Thousand cankers disease is widespread in black walnut in the western United States. Plant Health Progress doi: 10.1094/PHP-2011-0630-01-BR
Cranshaw, W. And M. Camper. 2010. Pest Control Industry: An assessment of current concerns and needs in Colorado and Wyoming. Colorado Agricultural Experiment Station Bull. TB-10-1.
Cranshaw, W. and N. Tisserat. 2010. Thousand Cankers Disease: A Recently Recognized Threat to North American Black Walnut. Arborist News 19 (1): 52-56.
Colvin, B. & Cranshaw, W. (2010) Comparison of over-the-counter insecticides for managing the european earwig, Forficula auricularia L. (Dermaptera: Forficulidae). Southwestern Entomologist, 35, 69–74.
Kramer, K. and W.S. Cranshaw. 2009. Effects of supplemental irrigation on populations of clover mite, Bryobia praetiosa Koch (Acari: Tetranychidae), and other arthropods in a Kentucky bluegrass lawn. Southwestern Entomologist 34 (1):69-74.
Tisserat, N., Cranshaw, W., Leatherman, D., Utley, C., and Alexander, K. 2009. Black walnut mortality in Colorado caused by the walnut twig beetle and thousand cankers
disease. Online. Plant Health Progress 11 August, 2009. doi:10.1094/PHP-2009-0811-01-RS