Field tests were conducted on 'Red Delicious' apples during the summers of 1966 and 1967 to evaluate several spray chemicals for control of the European red mite. Panonychus ulmi (Koch). The 1967 treatments were also evaluated for control of the two-spotted spider mite, Tetranychus llrticae Koch. Morestan® (6-methyl- 2,3-quinoxalineclithiol cyclic S,S-dithiocarbonate) gave long-lasting control of P. ulmi. Dicofol, EP-333 (N'- (4- chloro-o-tolyl) -N,N-dimethylformamidine hydrochloride), Lovozal® (phenyl 5,6-dichloro-2- (trifIuoromethyl) -I-benzi- Midazolecarboxylate), GS-19851 (isopropyl 4,4'-dibromobenzilate) Azodrin® (3-hydroxy-N-methy1-cis-crotonamide dimethyl phosphate), Bayer 58733 (2,2,2-trichloro-N- (pentachlorophenyl) acetimidoy1 chloride), and 2 petroleum oils also were effective. GS-19851 was the most effective material on T. urticae. Nearly as effective were Morestan, Lovozal, EP-333, and Azodrin. Bayer 58733 caused a rather severe defoliation of the trees, the only phytotoxicity observed.
Document Type: Research Article
Publication date: August 1, 1969
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