单选题IPM(Integrated Pest Management)(害虫综合治理)指的是从生态学观点出发,全面考虑生态平衡及社会安全、经济利益及防治效果,提出最合理及有益的治理措施;不着重害虫消灭,而重在害虫数量的调节,达到不造成经济为害的地步,因此在防治方法中,强调自然调节因素的利用,留下一部分害虫可能对自然平衡反而有利;各种防治方法的协调,但尽量采取非化学的防治方法,化学防治法除非达到经济阈值时,一般()。A不用B必须用C反复使用D强调使用
单选题
IPM(Integrated Pest Management)(害虫综合治理)指的是从生态学观点出发,全面考虑生态平衡及社会安全、经济利益及防治效果,提出最合理及有益的治理措施;不着重害虫消灭,而重在害虫数量的调节,达到不造成经济为害的地步,因此在防治方法中,强调自然调节因素的利用,留下一部分害虫可能对自然平衡反而有利;各种防治方法的协调,但尽量采取非化学的防治方法,化学防治法除非达到经济阈值时,一般()。
A
不用
B
必须用
C
反复使用
D
强调使用
参考解析
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