Abstract
Aphicidal activity of an insecticidal soap, M-Pede, on the green peach aphid, Myzus persicae, was observed under three different humidity conditions (30, 60 and 90% RH) in order to determine its practical value. The results revealed that humidity greatly affects activity : as humidity fell so did aphicidity. Reductions in activity under lower humidities were minimized by a high-dose application (0.6% AI) or by adding compounds which retard the solution evaporation, such as potassium acetate, glycerin, chondroitin sulfate sodium salt, sodium pyroglutamate, sodium polyacrylate, sodium carboxymethyl cellulose, xanthan gum, and sodium alginate.
