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. This includes: development of management methods for insect/mite pests of landscape plants and vegetable crops, particularly those that that minimize non-target impacts and/or are compatible with organic production; development of action thresholds for insect pests of vegetables and incorporation of host plant resistance; and evaluation of non-target effects of pesticide applications to landscape plants and vegetables. Research efforts also are designed to be flexible enough to respond to new insect/mite problems that do affect horticultural crops or cause nuisance problems in Colorado.
Extension responsibilities primarily involve outreach activities related to diagnosis and management of insect pests of horticultural crops in Colorado. Shared Extension responsibilities (with Frank Peairs) also extend to management of household insects, those of medical importance, 4-H entomology, and general entomological inquiries.
Following the discovery and 2008 description of thousand cankers disease of walnut (with Ned Tisserat), I have shifted considerable effort to research and Extension activities related to management and containment of this emergent threat to North American Juglans.
Courses I Teach:
BSPM 102: Insects, Science and Society (Fall semester)
BSPM 303B: Horticultural Entomology Lab (3 sections) (Fall semester)
BSPM 510: Insect Plant Disease Relationship
2004. Cranshaw, W. Garden Insects of North America. Princeton University Press. Princeton, NJ. 678 pp.
Cranshaw, W., D. Leatherman, W. Jacobi and L. Mannix (coordinators). 2004 (Revision). Insects and Diseases of Woody Plants of the Central Rockies. Cooperative Extension Bulletin 506A. 292 pp.
Cranshaw, W., E. Grafius, T-X Liu, B. Nault, and D. Riley. 2005. Chapter 11. Onions in Vegetable Insect Management. ed. R. Foster and B. Flood. Meister Publishing Co. Willoughby, Ohio. 264 pp.
Cranshaw, W. and B. Kondratieff. 2006. Guide to Colorado Insects. Westcliffe Publishers, Inc. Englewood, CO. 232 pp.
Cranshaw, W.S. 2006. Attitudes and concerns about spiders expressed in a Freshman entomology class. American Entomologist 52(4): 234-238.
Cranshaw, W. and M. Camper. 2007. Management of poplar twiggall fly on nursery-grown aspen. J. Env. Hort. 25(1): 33-35.
Kondratieff, B. and W. Cranshaw. 2007. Common Insects, Spiders, Ticks, and Scorpions of Fort Sill, Oklahoma. United States Government Printing Office 653-331. 85 pp.
Cranshaw, W.S. 2008. II. Pests. in Compendium of Onion and Garlic Diseases and Pests, 2nd Edition. Ed. H.F. Schwartz and S.K. Mohan. APS Press. St. Paul, MN. 127 pp.
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
Cranshaw, W. And M. Camper. 2010. Pest Control Industry: An assessment of current concerns and needs in Colorado and Wyoming. Colorado Agricultural Experiment Station Bulletin TB-10-1 5 pp.
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.
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.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.