Armored Scale Control with Non-Oil Scalecides, 1977

Two rates each of SD 43775 and Imidan were compared to Supracide for scale control on Marrs Early orange trees. Treatments were completely randomized and replicated three times in single-tree plots. Applications were made using a 2 gal Hudson Sprayer with CO2 at 80 psi as a spray propellent. Spray was applied until runoff, with an area of ca. 2 square meters sprayed in each tree. Treatments were made on Aug 3’77, with scale mortality counts of both crawler and sessile stages at 2 and 6 weeks posttreatment. At each count, 8-10 terminals consisting of twigs, leaves and fruit were sampled from the treated areas in each tree and examined for scale under a binocular microscope. Any mortality from parasitism, chiefly by Aphytis sp., was recorded and subtracted from mortality due to the scalecide treatment.