Abstract
From 1956 through 1961, 24 insecticidal and two primarily fungicidal materials were evaluated at Quincy, Florida, for control of the green peach aphid. Myzus persicae (Sulzer), on shade-grown tobacco. Weekly applications of 4% Diazinon® (O, O-diethyl O-(2-isopropyl-4-1-methyl-6-pyrimidinyl) phosphorothioate), 1.5% Phosdrin® (a mixture of the alpha isomer of 2-carbomethoxy-1-methylvinyl dimethyl phosphate (not less than 60%) and related compounds (not more than 40%)), 4% Thiodan® (6, 7, 8, 9, 10, 10-hexachloro-1, 5, 5a, 6, 9, 9a-hexahydro-6, 9-methano-2, 4,3-benzodioxathiepin-3-oxide), or 3% Trithion® (O, O-diethyl S-p-chlorophenylthiomethyl phosphorodithioate) showed considerable promise as possible substitutes for 1% parathion. Two per cent endrin, 5% malathion, or 1.5% Telodrin® (1,3,4,5.6,7,8, 8-octachloro-1,3,3a,4,7,7a-hexahydro-4,7-methanoisobenzofuran applied weekly gave commercial control; however, the three materials were not so efficient as 1% parathion. Applications of 1% parathion at 2-week intervals decreased injurious aphid populations and maintained effective control. Results indicated that absolute or 100% control was not essential to guarantee a commercially successful crop. Although resistance by this aphid to organic phosphate insecticides has been reported on various crops in other localities, no evidence of resistance was found on tobacco in the Quincy area.
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