Field Control Efficacy of Seven Pesticides to the Melon Aphids Aphis gossypii Glover(Hemiptera:Aphididae)

The field control efficacy of seven pesticides to the melon aphid were studied.The results showed that 10% imidacloprid,1.8% abamectin,3% acetamiprid,1% emamectin benzoate and 40% chlorpyrifos all had good control efficacy to the melon aphids,with controlling effects of more than 99% after 3 d.10% imidacloprid and 1.8% abamectin had good persistent effect with control effect of more than 96% after 28 d.24% spirotetramat start to show controlling effect lastly with controlling effect of 70.64% after 3 d,82.34% after 7 d and 73.52% after 14 d.