Aharonson, N., Dept. of Chemistry of Pesticide Residues and Natural Products, ARO, The Volcani Center, Bet Dagan, Israel
Magal, Z., Extension Service, Israel Ministry of Agriculture, Be’er Sheva, Israel
Muszkat, L., Dept. of Chemistry of Pesticide Residues and Natural Products, ARO, The Volcani Center, Bet Dagan, Israel
Tepperman, D., Kibbutz Mefalsim, Ashqelon Post, Israel
Goren, E., Kibbutz Mefalsim, Ashqelon Post, Israel
Tadmor, U., Agan Chem. Co., Ashdod, Israel

Cotton was grown in loess soil, in rows 1 m apart, and drip-lines were placed in the center of every second space between rows at a distance of 50 cm from the plants. Aldicarb was applied as granules (containing 15% a.i.) to the field on two dates (mid-June and mid-July) and incorporated into the soil a 25 cm from the plants, i.e., equidistant from the plants and the drip-lines, on both sides of the drip-lines; and b 50 cm from the plants, i.e., in the center of the spaçe between the rows, near the drip-line. Measurements of mortality of Bemisia tabaci larvae, and of the accumulation of aldicarb from the late (mid-July) treatment showed that best control of the pest and the highest aldicarb residues were obtained with the late treatment. The pest control effectiveness was found to depend on both date and location of aldicarb application. Early treatment (mid-June) was more effective if applied close (25 cm distance) to the plant stems, whereas late treatment (mid-July) was more effective if applied at a distance of 50 cm from the plant stems. © 1986, Springer Science + Business Media B.V.. All rights reserved.