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The Effectiveness of Residues of Insecticides in Preventing Reinfestation of Apple Leaves by Apple Aphid, Aphis pomi DeG.: II Thiodan and Guthion1

Published online by Cambridge University Press:  31 May 2012

D. P. Pielou
Affiliation:
Research Station, Research Branch, Canada Department of Agriculture, Summerland, British Columbia
K. Williams
Affiliation:
Research Station, Research Branch, Canada Department of Agriculture, Summerland, British Columbia

Extract

In a previous paper (16) an account was given of the relative efficiency of dry deposits of Diazinon [0,0-diethyl 0-(2 isopropyl-4-methyl-6-pyrimidyl) phosphorodithioate], Trithion [0,0-diethyl S-(p-chlorophenylthiomethyl) phosphorodithioate] and Sevin[l-naphthyl N-methylcarbarnate] in preventing the reinfestation of apple trees by the apple aphid, Aphis pomi DeG. In those experiments no comparison was made of the initial effectiveness of the insecticides in killing aphids by direct contact while the spray deposits were still liquid. Instead, interest was concentrated on the relative progress of recolonization of aphid-free trees, by aphids, as a measure of the effectiveness of dried and aging deposits. In the work reported here the results of similar investigations on two further aphicides are described.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1961

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