Evaluation of soybean aphids against various doses of synthetic insecticides collected from different regions of China

Aphids are a diverse herbivorous group which can infect a variety of plants direct or in direct ways. The effect of soybean aphids may lead to decline plant vigour and growth rates and ultimately reduced the yield. We evaluated effects of Five insecticides on soybean aphids collected from five different regions of China (Changchun, Jiamusi, Zhalan, suihua and Qiqihar) at specific doses under controlled conditions during soybean growing session 2018. Insecticides used were Omethoate, Imidacloprid, Spirotetramat Malathion and Acetamiprid at recommemded does of 10, 30, 50, 100 and 150. Our results indicated that, In case of Jiamusi aphids, Malathion dose 10 showed relatively greater effect (19.5a) than others. In case of Changchun aphids, Spirotetramat dose 10 showed (19.33a) while Qiqihar aphids at dose 10 in response to Spirotetramat showed (19a). In case of suihua aphids, Malathion using 10 multiple gives 17a and Zhalan aphids against Omethoate at dose 10 showed minimal result of (16.5a). In conclusion, our findings revealed the effectiveness of all listed insecticides against all soybean aphids, however, the toxicity was determined from maximum to minimum in this sequence, Malathion > Spirotetramat > Omethoate.