Apple, Effect of SD 204523 on European Red Mite Populations, 1984

An oxime pyrethroid, SD 204523, was tested for effect on mite populations. Small plot size was mandated because a very limited amount of the material was available. Consequently, treatment applications were made to single limbs with a compressed air backpack sprayer at 25 psi. Six 9-year-old York trees were used and each treatment was applied to 1 limb on each of the 6 trees. Each replicate limb and the adjacent limbs were sprayed to runoff. Drift to other test limbs was avoided by selecting limbs that were some distance apart. Treatments were applied on 12 Jul. Vendex 4F was used as a standard for comparative purposes. Mite populations were evaluated by randomly selecting 10 leaves/limb, brushing onto glass plates and counting motile mites and viable eggs under a binocular microscope.