Materials evaluated as acaricides for use on citrus 1968--69

Seven candidate materials were evaluated in the field against populations of Phyllocoptruta oleivora (Ashmead). Five materials gave effective control of the citrus rust mite for 6 weeks compared with 4 weeks control for chlorobenzilate, used as a standard. The 5 materials giving satisfactory control included Acarol®--isopropyl 4,4′-dibromobenzilate; formetanate hydrochloride; 3M MBR-5667--2-methyl-1,3-dithiolane-2-carboxaldehyde O-(methylcarbamoyl) oxime; Stauffer R-10044 65W--N-[(1,1,2,2-tetrochloro-2-fluoroethyl)thio]methanesulfonani lide; and Upjohn U-27, 415--benzoyl chloride (2,4,6-trichlorophenyl)hydrazone. Armored scale populations consisting of Lepidosaphes beckii (Newman), L. gloverii (Packard), Parlatoria pergandii Comstock, and Aonidiella citrina (Coquillett) ranged from a combined low of 0.24 scales per leaf in the untreated check to a high of 0.80 scales per leaf in the U-27, 415 plots 9 weeks posttreatment. Differences were not significant. Scale parasite populations consisting of Aphytis lepidosaphes Compere, A. hispanicus (Mercet), Aphytis spp., Prospaltella elongata Dozier, P. fasciata Malenotti, and Prospaltella sp. were also apparently normal in all plots at 9 weeks posttreatment.