Oriental Fruit Moth Control with DDT1

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Abstract
Four sprays of DDT, 2 lbs. 50% wettable powder to 100 gal., at petal-fall and during the time plum curculio, Conotrachelus nenuphar, was active, effectively controlled oriental fruit moth, Grapholitha molesta. in an isolated peach orchard. Benzene hexachloride (6% gamma isomer) 3 lbs. to 100 gal. was included in the last 3 applications for plum curculio control. Polyethylene polysulfide sticker used at 0.5 lb. to 100 gal. in the 2d application injured peach foliage. Daily bait trap captures, of moths dropped to a low level following the 1st DDT spray and larval injury to the twigs was light throughout the season. At harvest fruit injury amounted to 0.7%, whereas where 3 sprays of DDT were applied late in the season in an orchard nearby it was 2.7%. Infestations of two-spotted spider mite, Tetranychus bimaculatus. built up in this orchard during July and control measures were necessary early in Aug. Build-up of mite populations where early DDT sprays were applied appeared to occur earlier in the season than where DDT was first used after July 1.

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