Evaluation of Insecticides for Control of the Two-Lined Spittlebug on Florida Pastures12

Abstract

Seven chemical control experiments were conducted against Prosapia bieincta (Say) on pangolagrass, Digitaria decumbens Stent., and St. Augustinegrass, Stenotaphrum secundatum (Walb.) Kuntze, at 2 locations in Florida. Sprays were more effective against adults than granular formulations. Azinphosmethyl in 1967, and in 1968, dimethoate, endosulfan, diazinon, and parathion each sprayed at 0.5 lb AI/acre controlled the adults. Sprays of Dursban® ( O,O -diethyl O -3,5,6-trichloro↓2-pyridyl phosphorothioate) and GS-13005 ( O,O -dimethyl phosphorodithioate S-ester with 4-(mercaptomethyl)-2-methoxy∆2 1,3,4-thiadiazolin-5-one) at 2 lb AI/acre and carbaryl at 1.5 lb AI/acre also controlled the adults. Granular applications of aldicarb, Dursban, and phorate at 2, 0.2, and 1 lb AI/acre, respectively, initially controlled the adults. Many granular materials probably will control the adults, but valid data were difficult to obtain because of the small plots and mobility of the adult. Granular systemic insecticides provided the best control against nymphs. Aldicarb, Bayer 37289 ( O -ethyl O -2,4,5-trichlorophenyl ethylphosphonothioate), carbofuran, Mobam® (benzo[blthien-4-yl methylcarbamate) at 2 lb AI/acre, and Durshan at 0.2 lb AI/acre gave above 85% control of the nymphs in 1 experiment. Phorate at 1 lb AI/acre yielded excellent control of the nymphs through 27 days following application on St. Augustinegrass. Aldicarb at 0.5 lb AI/acre and Dyfonat® ( O -ethyl S-phenyl ethylphosphonodithioate) at 1 lb AI/acre gave 96% and 87% control 20 days after application. On pangolagrass in 1968, Dyfonate, Bayer 37289, ph orate, carbofuran, and Dasanit® ( O,O -diethyl O -[ p -(methylsulfinyl) phenyl) phosphorothioate) each at 1 lb AI/acre, propoxur at 1.5 lb AI/acre, methomyl at 2 lb AI/acre, and aldicarb at 0.5 lb AI/acre all gave more than 85% control of the nymphs.