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近年来 ,随着豫西苹果挂果面积的迅速扩大 ,棉铃虫在苹果园中的危害程度日趋加重。在不少果园该虫已成为蛀果的主要害虫。因对硫磷、杀灭菊酯等对该虫防效较差 ,施药量逐年加大 ,虫果率仍在 3%～ 5% ,甚至更高。为了有效地控制其危害 ,选出防治棉铃虫最佳药剂 ,我们进行了此次
In recent years, with the rapid expansion of the fruit-bearing area of apples in the west of Henan Province, the harm degree of cotton bollworm in the apple orchard has been aggravating day by day. In many orchards the worm has become the main pest of borers. Due to parathion, fenvalerate and other insecticides on the poor control efficiency increased year by year, the fruit rate is still 3% to 5%, or even higher. In order to effectively control its harm, choose the best treatment of bollworm pharmaceutical, we conducted this