Quantifying biological control of pear psylla in a cover crop system

CSANR Project 075

Status: Complete

Annual Entries


Principal Investigator: David Horton
Additional Investigators: Vince Jones
Tom Unruh
Progress Report: http://csanr.wsu.edu/wp-content/uploads/2009/06/Horton-final-report-PR-07-702.pdf


Manuscript to be submitted winter 2011

Additional Funds Leveraged

Western Region SARE (2008-2009): $121,092; Washington Tree Fruit Research Commission (2007-2009): $45,000

Impacts and Outcomes

The primary natural enemies of the targeted pest (pear psylla) are mostly confined to pear tree, and are little affected by cover crop; i.e., our movement trials showed little back-and-forth movement between cover crop and tree for the important predators of pear psylla. Thus, the alfalfa cover crop was found not to contribute extensively to biological control of the targeted pest in this system. Nitrogen content in pear trees increased in cover crop plots compared to control (grass understory) plots.