Filbertworm control trials: Two new insecticides tested on Payne, Franquette and Hartley walnuts in two experimental orchards in northern California
California Agriculture 12(4):10-11.
Published April 01, 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.