Tuesday, December 12, 2006 - 3:47 PM

Development and evaluation of an IPM program for the western spotted cucumber beetle (Diabrotica undecimpunctata undecimpunctata) in snap beans in western Oregon

John M. Luna, lunaj@oregonstate.edu, Windy C. Beck, windybeck@hotmail.com, and Adam R. Poole, graceandadam@hotmail.com. Oregon State University, Dept. of Horticulture, 4017 Agricultural and Life Sciences Bldg, Corvallis, OR

An IPM scouting program was implemented in snap beans in Western Oregon for the western spotted cucumber beetle (WSCB), Diabrotica undecimpunctata undecimpunctata. In 2004, 2005, and 2006, field scouts sampled 105, 125, and 325 fields respectively. During the first year, information on pest abundance was delivered to growers without pest control recommendations. In 2005, participating growers selected action thresholds based on individual perceptions of risk. In the third year, a fixed action threshold of three beetles per 10 sweeps was used. In 2006, participating IPM growers reduced pesticide applications by more than 50% compared to non-IPM growers. Product quality loss to insect damage was comparable between IPM and non-IPM growers. Aggregation of adult beetles along the edges of bean fields next to corn fields was documented and spatial distributions were modeled using spline regressions. Knowledge of beetle aggregation behavior was used to target strip spraying in several fields. Trap and kill technologies using kairomone lures and baited traps were also evaluated.

Species 1: Coleoptera Chrysomelidae Diabrotica undecimpunctata (western spotted cucumber beetle)

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