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EFFECTS OF INSECT GROWTH REGULATORS1 ON THE WESTERN SPRUCE BUDWORM (CHORISTONEURA OCCIDENTALIS) (LEPIDOPTERA: TORTRICIDAE): II. FECUNDITY AND FERTILITY REDUCTION FOLLOWING LAST INSTAR TREATMENTS

Published online by Cambridge University Press:  31 May 2012

Jacqueline L. Robertson  and
Richard A. Kimball
Jacqueline L. Robertson
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U. S. Department of Agriculture, Berkeley, California 94701
Richard A. Kimball
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U. S. Department of Agriculture, Berkeley, California 94701
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Abstract

The fecundity and fertility of parent adult western spruce budworm, Choristoneura occidentalis Freeman, which survived treatment with IGRs in their last larval stage was assessed. With few exceptions, IGR treatment significantly reduced both reproductive factors regardless of whether the male or female parent had been treated. A simple model estimating population reduction in the F1-generation based on lethal and reproductive effects on the parents is described. If IGRs were applied at a dosage of 154 g/ha (ca. 2 oz/acre), the estimated percentages of F1 reduction which would result ranged from 74.6 (ZR-515) to 99+ (ZR-512 and Ro 10-3108 (oil)).

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 12 , December 1979 , pp. 1369 - 1380
Copyright
Copyright © Entomological Society of Canada 1979

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References

Guenther, W. C. 1964. Analysis of Variance. Prentice Hall, Englewood Cliffs, N. J.199 pp.Google Scholar
Robertson, J. L. and Kimball, R. A.. 1979. Effects of insect growth regulators on the western spruce budworm (Choristoneura occidentalis) (Lepidoptera: Tortricidae) I. Lethal effects of last instar treatments. Can. Ent. 111: 1361–1368.CrossRefGoogle Scholar