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IPM 25th2005 Annual Report

UC Statewide IPM Program

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Hackberry aphidHackberry aphid: Pest Note update and ongoing research

The Asian hackberry woolly aphid was introduced into California in 2002. It spread quickly throughout the state, infesting Chinese hackberry trees. The aphids produce excessive amounts of honeydew, creating a nuisance and prompting pesticide applications to trees that had been relatively pest- and pesticide-free.

Long-term strategies such as biological control and preventive aphid control need further research. Mary Louise Flint, entomologist and IPM Education and Publications director, and Steve Dreistadt, UC IPM senior writer, are studying the influence of irrigation practices, reduced pesticide rates, and treatment timing for aphids and scales infesting hackberry trees on the UC Davis campus. Their study is coordinated with hackberry aphid research by Andrew Lawson, assistant professor, California State University, Fresno, and Pamela Geisel, environmental horticulture advisor, UCCE, Fresno. University of California's Elvenia J. Slosson Endowment Fund and the UC Exotic/Invasive Pests and Disease Research Program are funding their research at several Central Valley sites.

Pest Note: Hackberry Woolly Aphid (ANR 74111) has been revised to summarize expert observations and preliminary results of research on this new exotic pest. The revised Pest Note provides more information on integrating aphid control with management of less-widespread hackberry problems: citricola scale and an unidentified malady believed to be a new vascular wilt disease.

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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