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四、防治农业害虫的经济观 防治农业害虫,除了注意生态学的问题以外,还要遵循经济规律,讲求经济效益,对一种害虫防治措施的评价,要把采取此措施的农业投资和它产生的实际经济效果综合起来分析。农业种植业的纯收益,最终决定于作物的产量、品质、价格与农本,对农户来说,防治害虫的基本目的就是要使纯收益增加,期望花最少的费用而获得最大的收益。在经济学上,凡是一种管理措施,只有当它的费用少于或等于它所产生的纯收益时才算合理,所以在害虫防治中,如何选择最佳的防治方案,提高经济效益,是十分重要的。害虫防治中的经济学涉及诸多问题,现就经济受害允许水平、经济阈值和害虫危害与损失等问题简单作一介绍。
Fourth, the prevention and control of economic pests of agricultural pest prevention and control of agricultural pests, in addition to pay attention to ecological issues, but also to follow the economic laws and emphasize economic benefits, a pest control evaluation, we should take this measure of agricultural investment and it produce The actual economic results combined analysis. The net income of agricultural plantation ultimately depends on the yield, quality, price and agricultural production of crops. For farmers, the basic purpose of pest control is to maximize net income with the expectation of the least cost. In economics, a kind of management measure is reasonable only when its cost is less than or equal to the net income it produces. Therefore, in pest control, how to choose the best prevention and control plan and increase the economic benefit is Very important. The economics of pest control involves many problems, and is now a brief introduction to the level of allowances for economic victimization, economic thresholds and pest hazards and losses.