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United States Department of Agriculture

Agricultural Research Service

Title: More on Aphids and Their Natural Enemies in Washington Wheat

Authors
item Clement, Stephen
item Elberson, Leslie
item Young, Francis
item Youssef, Nadeer - U OF IDAHO

Submitted to: Entomological Society of America Regional Meetings
Publication Type: Abstract Only
Publication Acceptance Date: March 23, 2001
Publication Date: N/A

Technical Abstract: This abstract summarizes five years of insect data from the 'Ralston Project,' a multi-disciplinary, multi-year, and multi- agency/institution project that examined economic and environmental feasibility of reduced-tillage and continuous cropping systems to replace the traditional winter wheat/fallow system in the semi-arid grain production area of central Washington. The majority of aphids were Russian wheat aphid and English grain aphid. Overall, more aphids were recorded on spring wheat than on winter wheat. An insecticide application controlled Russian wehat aphid in hard read spring wheat in 1996 because populations approached the economic threshold. An insecticide application was not required to control English grain aphid during the five year study. Hymenopterous parasistoids were infrequently reared from cereal aphids. Predacioius ladybird beetles were fairly numerous in 1998 and 2000 and may have regulated populations of English grain aphid. Cereal aphids and their natural enemies exhibited year-to-year variability in occurrence during this study. The cropping systems had no effect on aphid populations.

Last Modified: 12/27/2014
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