Abstract
In Trinidad, 56 insecticides were screened in the laboratory between 1969 and 197l a possible replacements for carbaryl a residual, and Malathion, a non-residual compound used against the foliage feeding adults of the sugar-cane froghopper Aeneolamia varia saccharina (Dist.). The results of bioassays which compared the contact activities of topically applied insecticides and estimated the residual life of insecticides applied to sugar-cane foliage are given. Aminocarb, azinphos-methyl, methiocarb, monocrotophos, omethoate and propoxur are more effective than or similar to carbaryl. Dioxacarb, Dursban [O,O-diethyl-O-(3,5,6-trichloro-2-pyridyl) pho phorothioate], mecarbam, methidathion, phosmet, and vamidothion are superior to or similar in initial effect but less residual than carbaryl. Carbofuran and thiocarboxime [Talcord (S-2-cyanoethyl N-[(methylcarbomyl)oxy]thioacetirnidate)] are highly effective but are considered too toxic for use in Trinidad. Ultra low volume formulations of diazinon, fenitrothion, fenthion and possibly phoxim show promise as potential alternatives to malathion.
