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REPLACEMENT OF TYPHLODROMUS OCCIDENTALIS BY T. CAUDIGLANS AND T. PYRI (ACARINA: PHYTOSEIIDAE) AFTER CESSATION OF SPRAYS ON APPLE TREES1

Published online by Cambridge University Press:  31 May 2012

R. S. Downing  and
T. K. Moilliet
R. S. Downing
Affiliation:
Research Station, Canada Department of Agriculture, Summerland, British Columbia
T. K. Moilliet
Affiliation:
Research Station, Canada Department of Agriculture, Summerland, British Columbia
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Abstract

Organophosphorus sprays were applied during 1968 and 1969 to an unsprayed but otherwise well cared for apple orchard to destroy the resident phytoseiid predators, Typhlodromus caudiglans Schuster and T. pyri Scheuten. The phytoseiid commonly found in commercial orchards in British Columbia, T. occidentalis Nesbitt, was then released into the orchard.The population density of T. occidentalis increased greatly during 1970 but in the absence of sprays the resident predators reappeared. By the end of the 1971 season, T. caudiglans and T. pyri were once again the main phytoseiid predators and T. occidentalis was relegated to an insignificant role.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 6 , June 1972 , pp. 937 - 940
Copyright
Copyright © Entomological Society of Canada 1972

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References

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