Abstract
The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a serious pest of young paddy crop in Guyana. Comparative toxicity of 35 insecticides to 4-to 5-day-old armyworms was worked out. Eight insecticides, comparatively more toxic than the rest, were further tested for their relative toxicity. At LC50 fenitrothion, azinphosmethyl, lodofenphos [ O -(2,5-dichloro-4-iodophenyl) O, O -dimethyl phosphorothioate], phoxim, methomyl, Gardona® [2-chloro-1-(2,4,5-tricholorophenyl)vinyl dimethyl phosphate, and American Cyanamid CL-47470 [cyclic propylene P, P -diethyl phosphonodithiomidocarbonate] were 12.1, 8.1, 5.4, 3.3, 2.8, 1.7 and 1.4 times respectively more toxic than Chlofenvinphos [2-chloro-1-(2,4-dichlorophenyl)-vinyl diethyl phosphate]. In field trials, fenitrothion emulsion spray at 120-185 g AI/ha controlled the armyworm infesting up to 5-week-old paddy. With natural wind velocity of 10-15 km/h drift spraying could be carried out using a motorized knapsack sprayer fitted with a low-volume attachment. The drift swath was 9 m, and 3.5 liters of spray fluid was required per hectare. It took about 21 min to treat 1 ha of paddy.
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