Evaluation of Some Acaricides for Control of Spider Mites on Three Woody Ornamentals in Louisiana

Seven compounds were evaluated for control of some spider mites on 3 ornamental plants in Louisiana. These were: Acaralate® (isopropyl 4,4’-dichlorobenzilate), GS-19851 (isopropyl 4,4’-dibromobenzilate), GS-13005 ( O, O- dimethyl phosphorodithioate S -ester with 4-(mercaptomethvl)-2-methoxy-∆2-1,3,4-thiadiazolin-5-one), Galecron® ( N’- (4-chloro-o-tolyl)- N, N -dimethylformamidine), Nissol® (2-f1uoro, N-methyl- N -I-naphthylacetamide) (may apply only to 25% EC), chlorobenzilate, and tetradifon. GS 13005 and GS-198.51 were most effective in controlling the southern red mite, Oligonychus ilicis (McGregor), on holly and azaleas and the two-spotted spider mite, Tetranychus urticae Koch, on roses. GS-13005 was most effective in controlling a green mite, Eotetranychus clitus (Pritchard & Baker), and GS-19851 ill controlling the privet mite, Brevipalpus obovatus Donnadieu, on azaleas. Other compounds gave a significant degree of control, but none were so effective as GS-13005 and G5-19851.