Effects of granular insecticides on the control of some pests during early growth stage of watermelon plants.
The effectiveness of applications of granules of several different insecticides for the control of various pests of watermelon during the early growth stages was determined in field tests in Taiwan in 1981-82. One-third of the insecticides was applied in the planting holes prior to planting, and the remaining two-thirds side-dressed 10 days after planting. Infestation levels 10-90 days after the 2nd application showed that 10% phorate (Thimet) and 10% aldicarb (Temik) were the most effective treatments against Brachytrupes portentosus (Licht.), 3% carbofuran (Furadan) and 10% aldicarb against Aphis gossypii Glov. (control lasting 50-70 days), 3% carbofuran and 10% aldicarb against Thrips flavus Schr. (control lasting 30-50 days), 10% Contraven [of unstated composition] against Liriomyza sp., and 10% aldicarb against Tetranychus kanzawai Kishida (control lasting up to 70 days).