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SUPPRESSION OF CODLING MOTH, LASPEYRESIA POMONELLA (LEPIDOPTERA: OLETHREUTIDAE), BY RELEASE OF STERILE AND PARTIALLY STERILE MOTHS1

Published online by Cambridge University Press:  31 May 2012

M.D. Proverbs ,
J.R. Newton  and
D.M. Logan
M.D. Proverbs
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
J.R. Newton
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

Because laboratory and field cage experiments had shown that partially sterile (25 krad dose) male codling moths were sexually more competitive than sterile (40 krad) ones, a study was made in a British Columbia orchard in 1970 to determine whether release of 25 krad moths of mixed sexes would suppress this pest more effectively than release of 40 krad moths. Approximately 75,000 moths/ha were released from 24 April to 25 September for each dose level. In the 25 krad moth release plot, the percentage of apple fruits damaged by this pest at harvest was reduced from 0.21 in 1969 to 0.08 in 1970, whereas in the 40 krad plot damage was reduced from 0.04 in 1969 to 0.02 in 1970.

Release of 25 krad moths was also compared with insecticide sprays for codling moth suppression in two small areas at Cawston and Olalla, B.C. At Cawston, the percentage of apples damaged at harvest was reduced from 1.0 in 1969, after three sprays of phosalone, to 0.1 in 1970 after release of irradiated insects. In contrast, per cent damage in a nearby apple orchard, sprayed twice with azinphos-methyl in 1969 and 1970, increased from 2.0 in 1969 to 8.1 in 1970. At Olalla, per cent damage was about the same (0.5) in 1969, after three phosalone sprays, as in 1970 (0.6) after release of irradiated insects. In a neighboring apple orchard, sprayed twice with phosalone in 1969 and 1970, per cent damage was about the same (1.0–1.2) each year.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 10 , October 1978 , pp. 1095 - 1102
Copyright
Copyright © Entomological Society of Canada 1978

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References

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