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The Toxicity of Malathion, Perthane, Maneb and Zineb to Trialeurodes vaporariorum (Westwood)

Published online by Cambridge University Press:  31 May 2012

R. D. McMullen
R. D. McMullen
Affiliation:
Research Station, Research Branch, Canada Department of Agriculture, Harrow, Ontario
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Abstract

In laboratory experiments wettable and emulsifiable malathion and Perthane were most toxic to adult T. vaporariorum and progressively less so to the larval stages in order of development. Eggs were not killed. Perthane was most toxic at low temperatures, malathion at high temperatures. Malathion was more toxic than Perthane and the emulsifiable formulations of both more toxic than the wettable formulations. Against first-instar larvae, at the LD50, level, 70% maneb and 50% Perthane wettable powders were equally toxic but 65% zineb wettable powder was less toxic. Against adults, 70% maneb and 65% zineb wettable powders were one-half and one-third as toxic as 50% Perthane wettable powder at the LD50, level. Tests of spray mixtures against larvae with either 25% malathion or 50% Perthane wettable powders added to either 70% maneb or 65% zineb wettable powders showed neither synergistic nor antagonistic effects.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 3 , March 1964 , pp. 541 - 549
Copyright
Copyright © Entomological Society of Canada 1964

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