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Spodoptera frugiperda 1 Chemical Control in Paddy by Using Ultra-Low-Volume Drift Spraying2
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-l-(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.
Document Type: Research Article
Publication date: December 1, 1973
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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