Abstract
Results are presented from a series of tests with varying dosages of each of 46 insecticides in acetone solution sprayed on wheat for protection against adults of the rice weevil, Sitophilus oryzae (L.), granary weevil, Sitophilus granarins (L.), and confused flour beetle, Tribolium confusum Jacquelin duVal. Mortality of adult insects recorded after an exposure of 14 days was the only criterion used to assess the effectiveness of insecticide deposits. Malathion was used as the standard insecticide in making comparisons. Fenthion was the most effective compound tested. American Cyanamid 12008 (O,O-diethyl S-isopropylthiomethyl phosphorodithioate), and Bayer 41831 (O,O-dimethyl O- (4-nitro-m-tolyl) phosphorothioate) were less effective than fenthion but more effective than malathion as indicated by dosages resulting in 100% mortality of all 3 species of test insects. Bayer 25141 (O,O-diethyl O-p- (methylsulfinyl) phenyl phosphorothioate), Bayer 25198 (O-O-dimethyl O-p- (methylsulfinyl) phenyl phosphorothioate), and GC 3707 (dimethyl 3- (dimethoxyphosphinyloxy) glutaconate) were equally as effective as malathion under the conditions of the study.
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