University of California

Filbertworm control trials: Two new insecticides tested on Payne, Franquette and Hartley walnuts in two experimental orchards in northern California


Arthur H. Retan
George R. Post
Clarence S. Davis
A. E. Michelbacher

Authors Affiliations

Arthur H. Retan is Farm, Advisor, Butte County, University of California; George R. Post is Farm Advisor, Sutter County, University of California; Clarence S. Davis is Extension Specialist in Entomology, University of California; A. E. Michelbacher is Professor of Entomology, University of California, Berkeley.

Publication Information

Hilgardia 12(4):10-11. DOI:10.3733/ca.v012n04p10. April 1958.

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The intensity of the filbertworm infestation of walnuts in northern California in 1957 was less than in the peak year of 1954, but it marked the fourth straight year that the filbertworm has presented a problem. Based on past history the 1957 attack was surprising because observations have indicated that the pest would not continue at a highly destructive level over a period of several years.

Retan A, Post G, Davis C, Michelbacher A. 1958. Filbertworm control trials: Two new insecticides tested on Payne, Franquette and Hartley walnuts in two experimental orchards in northern California. Hilgardia 12(4):10-11. DOI:10.3733/ca.v012n04p10

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