DDT-Resistant Codling Moths on Pears in California1

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Several reports were received indicating inadequate control of codling moth (Carpocapsa pomonella (L.)) on pears with DDT during the 1958 season.

Field plots were established in three of the orchards to determine if a resistance problem was present and to evaluate other materials and combinations. Resistance was indicated by poor control with DDT, and no significant difference between plots treated with DDT plus parathion and parathion alone. Guthion® (O,O-dimethyl S-(4-oxo-1,2,3-benzotriazin-3-(4H-yl-methyl) phosphorodithioate) and Ethyl Guthion® 0,0-dicthyl S-(4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate) at 1 1/2 pounds per 100 gallons gave excellent control. When the dosage was reduced to 3/4 pound, there was a significant increase in codling moth entires in none thrial but not in another. An emulsion concentrate formulation was not as effective as the wettable powder.

Sevin® (1-naphthyl methylcarbamate) provided good control in all of the trials. Kepone® (decachloro8ctahydro-1,3,4-metheno-2H-cyclobuta[ed] pentalen-2-one) and Trithion® (S-(p-chlorophenylthio)methyl O,O-diethyl phosphorodithioate) did not provide commercial control. Diazinon® (O,O-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate) was effective when used at 2-week intervals, but was not satisfactory when compared with Sevin and Guthion in a standard schedule timed by bait pan catches.

Document Type: Research Article

Publication date: December 1, 1960

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