The Journal of Horticultural Science & Biotechnology
Vol. 41 No: 1
Field Tests of Acaricides for the Control of Red Spider Mite, Tetranychus Urticae Koch, on Strawberries
J.D.R. VERNON and E.B. DENNIS
Trials carried out between 1959 and 1963 showed that 0.04% demeton-methyl, 0.04% dimethoate, 0.04% ethion, 0.04% oxy-demeton-methyl and 0.05% trithion proved to be the best of 18 materials tested for control of red spider mite on strawberries; 0.05% vamidothion also gave good control in the only trial where tested. Of the other materials tested 0.04% azinphosmethyl, 0.25% chlorbenside, 0.03% tetradifon and 0.07% schradan gave moderate control.
Weather appeared to have an effect on the efficacy of some materials: 0.04% dicofol and 0.02% phenkapton gave good control in one trial when the temperature was above 60° F., but in other trials, when cold conditions prevailed for some weeks after the application, they gave comparatively poor control. Results with demeton-methyl and dimethoate were also affected by the temperature, as treatments proved more effective in early May in warm weather than in April under cooler conditions.
Populations of mite soon returned to high levels after spraying with demeton-methyl and dimethoate.
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