Control of the Peach Tree Borer with Guthion, Parathion and Thiodan 1

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Abstract
Thiodan (6,7,8,9,10,10-hexachloro-l,5,5[alpha],6,9,9[alpha]-hexahydro-6,9-methano-2,4,3,-benzodio-xathiepin 3-oxide) was more effective than Guthion (0,O-dimethyl S-4-ozo-1,2,3,-benzotriazin-3-(4H)-ylmethyl phosphorodithioate) and parathion in single applications made when 10% of the moths had emerged. Control with Thiodan was not significantly different from the other materials following two applications at 10% and 60% moth emergence. All materials showed some ovicidal action with parathion being most effective in this manner. The head capsules of larvae were measured and comparisons made in the size of survivors of each treatment. The marked effectiveness of Thiodan against established larvae suggests its possible use in postharvest treatments.