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Effect of Pre- and Post-Treatment Temperatures, Age of Deposit, and Repellency on the Toxicity of Kelthane to the Two-spotted Mite, Tetranychus telarius (L.) (Acarina: Tetranychidae)1

Published online by Cambridge University Press:  31 May 2012

R. W. Fisher  and
R. I. C. Hansell
R. W. Fisher
Affiliation:
Canada Department of Agriculture, Vineland Station, Ontario
R. I. C. Hansell
Affiliation:
Canada Department of Agriculture, Vineland Station, Ontario
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Abstract

Kelthane MF showed a positive temperature coefficient of toxicity to the two-spotted spider mite, Tetranychus telarius. An increase of about 1.2% mortality occurred for each degree rise in the range from 50-90°F. Pre-treatment of adult, female mites at three different temperatures for three days caused no significant difference in mortality at 74°F. Acaricidal potency of Kelthane MF on peach leaves declined rapidly both indoors and outdoors for the first two days. Thereafter the potency decreased at about the same rate outside, but much slower in the laboratory. Deposits on peach leaves repelled mites strongly for two days, but weakened rapidly over the next six days. Mites entered treated leaf areas after the acaricidal potency had dropped low, and so a larger than expected number of susceptible mites may have survived.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 10 , October 1964 , pp. 1307 - 1312
Copyright
Copyright © Entomological Society of Canada 1964

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