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research article

Population densities and economic injury levels of grape leafhopper

authors

F. L. Jensen
D. L. Flaherty, University of California
L. Chiarappa, DiGiorgio Fruit Corp.

publication information

California Agriculture 23(4):9-10. DOI: 10.3733/ca.v023n04p9. April 1969.

abstract

Abstract Not Available – First paragraph follows:

WHEN THE GRAPE integrated control project was started in 1961, the grape leafhopper, Erythroneura elegantula Osborn, was believed to be the primary pest of vineyards in the San Joaquin Valley. Also, it was believed that chemical treatments to control this insect were responsible for the increase of secondary pests such as spider mites. The basic aim of these studies was to determine what levels of leafhoppers could be tolerated without need of chemical treatments.

author affiliations

Frederik L. Jensen is Farm Advisor, Tulare County; Donald L. Flaherty is Research Entomologist, Division of Biological Control, University of California, Albany; Luigi Chiarappa, formerly Research Director, DiGiorgio Fruit Corp., DiGiorgio, California, is now Plant Pathologist, F. A. O., Rome, Italy.


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