Control of the Grape Leaf Folder in California

Abstract

Results are given of field tests made in 1958 and 1959 to control the larvae of the grape leaf folder, Desmia funeralis (Hbn.). Sprays of endrin, Sevin® (1-naphthyl-N-methyl carbamate), acid lead arsenate, and spores of Bacillus thuringiensis (Berliner) were effective in controlling first-brood larvae. Control was less persistent with Bacillus spores. Dusts of endrin, Sevin, and parathion were effective in controlling second-brood and third-brood larvae, but the Bacillus dust used was not effective. Sevin appeared to be compatible with Kelthane® (1,1-bis(p- chlorophenyl)-2,2,2-trichloroethanol) as a combination dust. Of previously untried insecticides, dimethoate and Bayer 22408 (O, O-diethyl O-naphtalimidophosphorothioate) were very promising, while Kepone® (-decachloroöctahydro-1.3,4-methano-2H-cyclobuta[ed]pentalen-2-one) and Methyl-Trithion®(S-(pchlorophenylthio) methyl O, O-dimethyl phosphorodithioate) were not satisfactory for control of third-brood larvae. The effectiveness of the insecticides tested on both grape leaf folders and grape leafhoppers. Erythroneura elegantula Osb., is discussed.