The residual toxicity of five insecticides on three varieties of corn and sorghum

Morallo-Rejesus, B. and Carino, F.O. (1976) The residual toxicity of five insecticides on three varieties of corn and sorghum. Philippine Agriculturist, 60 (3-4). pp. 96-104.

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The residual toxicity of 5 insecticides each at 10, 20, 30 and 50 p.p.m. to adults of Sitophilus zeamais Motsch. and Rhyzopertha dominica (F.) on stored grain from 3 varieties of maize and 3 varieties of sorghum was evaluated in the laboratory in the Philippines. Residual toxicity increased with increasing concentration of the compounds. S. zeamais was more susceptible than R. dominica to chlorpyrifos-methyl, malathion and pirimiphos-methyl, while R. dominica was more susceptible to tetrachlorvinphos and isoprocarb (MIPC); chlorpyrifos-methyl was effective against both species. The type of grain also influenced the effectiveness of the insecticides. Chlorpyrifos-methyl and tetrachlorvinphos had the longest residual action on maize, and chlorpyrifos-methyl also on sorghum. Malathion was more persistent on sorghum than on maize, and pyrimiphos-methyl more persistent on maize than on sorghum. Differences were also observed between the residual toxicity on different varieties of both maize and sorghum.ADDITIONAL ABSTRACT:In general, the residual activity of insecticides used to control Sitophilus zeamais and Rhizopertha dominica persisted longer in the sorghum varieties Cosor 1 and Cosor 3 than in Cosor 2 and longer in the maize varieties BPI3 and UPCA 1 than in UPCA 2

Item Type: Article
Author Affiliation: Department of Entomology, College of Agriculture, University of the Philippines at Los Banos, Luzon, Philippines
Subjects: Plant Protection > Pesticides
Plant Protection > Pests
Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 14 Sep 2012 05:27
Last Modified: 02 May 2017 07:58

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