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Distribution of Cocoons of a Neodiprion Sawfly Under Open-grown Conditions

Published online by Cambridge University Press:  31 May 2012

R. W. Stark  and
D. L. Dahlsten
R. W. Stark
Affiliation:
Assistant Professor, Department of Entomology and Parasitology, University of California, Berkeley.
D. L. Dahlsten
Affiliation:
Graduate Assistant, Laboratory Technician.
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Extract

The Neodiprion sawfly studied in this investigation is an undetermined species which attacks sugar pine, Pinus lambertiana Dougl., in California. The conditions of the infested area were particularly suitable for an investigation of some of the basic factors affecting distribution of cocoons on the ground. The efforts of previous workers (Prebble, 1943; Ives and Turnock, 1959) were complicated by dense stand conditions and deep, variable pound cover. The sawfly discussed here was found in considerable numbers on an isolated, young sugar pine at Grass Valley, California. The tree was 19 feet high, 16 vears old, with s diameter of 5.5 inches. The infestation was presumed to be recent as no effect on diameter growth was found, even though the tree possessed only the current year's foliage. The ground cover was extremely sparse and the soil was a compacted, sandy-clay, typical of many foothill areas in California.

Type
Articles
Information
The Canadian Entomologist , Volume 93 , Issue 6 , June 1961 , pp. 443 - 450
Copyright
Copyright © Entomological Society of Canada 1961

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References

Ives, W. G. H., and Turnock, W. J.. 1959. Estimation ot cocoon populations of the larch sawfly, Pristiphora erichsonii (Hartig). Canad. Ent. 91: 650–661.CrossRefGoogle Scholar
Prebble, M. L. 1943. Sampling methods in population studies of the European spruce sawfly, Gilpinia hercyniae (Hartig), in Eastern Canada. Trans. Roy. Soc. of Canada, (3) (V) 37: 93–126.Google Scholar