Palm Aphid Control on `Malayan Dwarf' Coconut Palms
Abstract
Seven insecticides (Orthene (O,S-Dimethyl acetylphosphoroamidothioate), carbofuran, dimethoate, disulfoton, methomyl, monocrotophos, and oxydemethonmethyl) applied as foliar sprays provided excellent control of the palm aphid, Cerataphis variabilis H.R.L., on `Malayan Dwarf' coconut palms, Cocus nucifera L. Dialifor gave only limited control. As a soil drench only dimethoate gave satisfactory control at 2 weeks post-treatment, but by 4 weeks Orthene, monocrotophos, and oxydemetonmethyl also gave 100% control. When applied by soil drench, the insecticides translocated very slowly to the spear leaves but provided excellent control on the other leaves within 1 week. Three species of coccinellidae, Cycloneda sanguinea (L.), Hippodamia convergens Guerin, and Olla abdominalis sobrina Csy., were observed as predators of this aphid.Downloads
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