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PROTECTION OF DOUGLAS-FIR FOLIAGE FROM WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) DAMAGE BY EARLY APPLICATIONS OF ACEPHATE (ORTHENE 75S)1

Published online by Cambridge University Press:  31 May 2012

Charles E. Richmond ,
Robert D. Averill  and
Carl E. Crisp
Charles E. Richmond
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California 94701
Robert D. Averill
Affiliation:
Regional Office, Forest Service, U.S. Department of Agriculture, Lakewood, Colorado 80225
Carl E. Crisp
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California 94701
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Abstract

Acephate (Orthene 75S) was applied to Douglas-fir (Pseudotsuga menziesii Mirbl. [Franco]) in spring 1976 to determine its efficacy for protecting current year’s foliage from western spruce budworm (Choristoneura occidentalis Freeman). Results showed budworm mortality for both treatments exceeded the checks by at least 91% at all sample periods. A significant degree of foliage protection was also achieved as measured by mean twig length and mean number of missing needles per twig. Samples of new growth were analyzed for residues of acephate and methamidophos (an active metabolite of acephate) by gas-liquid chromatography. Results showed that high levels of insecticide persisted for about 10 days, then dropped over a 5-day period to lower levels for the rest of the study, about 35 days.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 11 , November 1978 , pp. 1127 - 1132
Copyright
Copyright © Entomological Society of Canada 1978

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References

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