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在治虫上,有些地方流传“有虫治虫、无虫防虫”的说法,这是不科学的。它的后果是:①在防治上造成滥用农药,浪费资金,增加生产成本;②大量杀死天敌,使生态失去平衡,导致害虫狷獗;③害虫产生抗药性,给防治上带来更大困难;④化学农药残毒严重影响人畜健康。科学的治虫是需要有个防治标准的,不是有虫就治,更不是无虫防虫,而是达到或者超过标准的防治,低于标准的不治。作者认为确定这个标准的原则是:治虫的收益要大于或等于治虫药费、人工和药械损耗的总和。所以要根据害虫的发生密度和危害程度,运用统计方法,力求得出符合客观实际的损失数量,拟定出合理的防治标准(或称指标)。
In the case of pest control, some places spread the notion that pests are pests and insects are not pests, which is unscientific. Its consequences are: (1) causing abuse of pesticides in the prevention and control, wasting funds and increasing production costs; (2) killing a large number of natural enemies and causing ecological imbalances, leading to pest galling; (3) pest resistance and causing more difficulties in prevention and treatment ; ④ chemical pesticide residues seriously affect the health of humans and animals. The science of pest control is the need to have a standard, not a worm to rule, but not insects pest control, but to meet or exceed the standards of prevention and treatment, below the standard of the disease. The author believes that the principle of determining this standard is: the benefits of pest control is greater than or equal to the sum of the pest control costs, labor and equipment losses. Therefore, according to the density of pests and the degree of harm, the use of statistical methods, and strive to come to an objective quantity of losses, to develop a reasonable standard of prevention and control (or index).