Two trials on the control of sorghum aphid and soybean aphid with pirimicarb were carried out from 1980 to 1984. Results show that controlling the two aphids with 5% pir-micarb (wettable powder) is as effective as that with 40% rogor (emulsifiable concentrate) which is presently adopted in production. Though the effective rate of both aphidcides is more than 98% 48 hours after application, controlling the two aphids with pirimicarb has more advantages-less in dosage (75-125g av/ha in production) , lower in ...
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