Toxicity effects of an insecticidal soap on the green peach aphid [Homoptera: Aphididae].

Tremblay, É., Bélanger, A., Brosseau, M., and Boivin, G. (2009). "Toxicity effects of an insecticidal soap on the green peach aphid [Homoptera: Aphididae].", Phytoprotection, 90(1), pp. 35-39.

Abstract

Effects of an insecticidal soap on the survival, development and reproduction of the green peach aphid, Myzus persicae, were studied. Twenty-four hours after application at a concentration of 37.50 g L-1 the soap caused 100% mortality in all aphid instars, and LC50 (lethal concentrations causing 50% mortality in the population) were 1.50, 3.25 and 5.50 g L-1 for first and second instars, third and fourth instars, and adult M. persicae, respectively. Aphids that survived the LC50 had a shorter longevity than the controls. Both insecticidal soap and parasitoids could be used on a crop but, as the LC50 of the third and fourth instars and adult M. persicae are higher than that of the aphid parasitoid Aphidius colemani (2.75 g L-1), it is essential to avoid treating aphids with insecticidal soap when adult parasitoids are present in the crop.

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