Leafhopper Treatment Levels for: Thompson seedless grapes used for raisins or wine

Authors

C. D. Lynn
F. L. Jensen
D. L. Flaherty

Authors Affiliations

Curtis D. Lynn is Farm Advisor, Fresno County; Frederik L. Jensen is Farm Advisor, Tulare County; Donald L. Flaherty is Laboratory Technician, Division of Biological Control, University of California, Albany.

Publication Information

Hilgardia 19(4):4-5. DOI:10.3733/ca.v019n04p4. April 1965.

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Abstract

Preliminary results of field studies on economic treatment levels for control of grape leafhoppers indicate that many growers in the San Joaquin Valley use insecticides unnecessarily because they lack accurate knowledge of insect population levels. Thompson Seedless grapes also appear to be more tolerant of nymph populations than expected. Results also have shown that some insecticides result in a severe build-up of spider mite populations, and further screening is necessary to find materials with least harmful side effects on beneficial parasites and predators.