University of California

Effects of predators on control of pear psylla


Harold F. Madsen
Tim T. Y. Wong

Authors Affiliations

Harold F. Madsen is Associate Entomologist, Department of Entomology, University of California, Berkeley; Tim T. Y. Wong is Laboratory Technician II, Department of Entomology, University of California, Berkeley.

Publication Information

Hilgardia 18(2):2-4. DOI:10.3733/ca.v018n02p2. February 1964.

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Studies have been conducted for the past two seasons on the action of predators against the pear psylla. Most of the work has been done at the University of California Deciduous Fruit Station, San Jose, on a block of pears that has been left untreated. The trees at this orchard had received all cultural requirements except the application of pesticides. The orchard suffered heavily from pear psylla attack from 1959 through 1961. In 1962 predators (anthocorid bugs and lacewings) brought the pear psylla population to a low level. The trees (Winter Nellis on Old Home-Farmingdale root-stock) responded by growing vigorously, whereas in previous seasons, growth had nearly ceased and the foliage was yellow and sparse. Studies were continued in 196S to determine if the predators would continue to regulate the pear psylla population.

Madsen H, Wong T. 1964. Effects of predators on control of pear psylla. Hilgardia 18(2):2-4. DOI:10.3733/ca.v018n02p2
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