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A NEW APPROACH TO SAN JOSE SCALE CONTROL (HEMIPTERA: DIASPIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

R.S. Downing  and
D.M. Logan
R.S. Downing
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
D.M. Logan
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
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Abstract

A laboratory experiment demonstrated that in San Jose scale, Quadraspidiotus perniciosus (Comstock), the male is susceptible to a number of insecticides. Diazinon was the most effective as it killed the males before they emerged from their shells. Males emerged and survived for a short time before being killed by residues of azinphosmethyl and endosulfan. In an orchard, a petal fall spray of diazinon or Penncap E applied when male scales started to emerge gave good control of San Jose scale and was as effective as three summer sprays of diazinon timed to emergence of crawlers. Penncap E was ineffective against the crawlers. Post-bloom sprays are necessary to control infestations of incrusted scale because a pre-bloom oil application usually fails to contact live scale that may be underneath one or more layers of old dead scale.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 9 , September 1977 , pp. 1249 - 1252
Copyright
Copyright © Entomological Society of Canada 1977

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References

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