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1.施药时期不准一种情况是施药时间过早.打“保险药”。有的农户认为早用药保险,在病虫没有发生之前,给作物施上农药。由于多数农药的有效期只有1—2周,药效期一过,作物免不了遭受病虫危害。另一情况是施药时间过晚,打“补救药”。有的农户抱着侥幸心理而迟迟不施药,直到普遍出现危害症状,发生已较严重时才施药抢救,这时作物遭受的损失已不可挽回。必须认识到每种病、虫、草害都有其最佳防治时期,也叫防治适期,因此,选择施药时间应当充分考虑病、虫、草的发育期、作物生长进度和农药品质,以做到适时用药。 2.混用不合理合理混用农药能提高药效和工效,但有的只图省工,在不了解农药性质和防治适期是否吻合的情况下就任意将两种或两种以上农药混用,如此不但影响防效,同时也增加了农药成本。
1. The spraying period is not allowed a situation is too early spraying time. Some farmers think that early medication insurance, pesticide applications to crops before the occurrence of pests and diseases. Since most pesticides are valid for only 1-2 weeks and the expiration date expires, the crops will inevitably suffer from pests and diseases. Another situation is the application time is too late, hit “remedy ”. Some farmers hold the luck and delay in the application of medicine, until the general occurrence of hazardous symptoms, when the occurrence of more serious rescue facilities before the loss of crops suffered at this time has been irreparable. We must recognize that every disease, pest and weed has its best control period, also known as control period, therefore, choose the application time should take full account of disease, insect and grass development period, crop growth and pesticide quality, To be timely medication. 2. Mix unreasonable and reasonable mix of pesticides to improve efficacy and work efficiency, but some only labor-saving, without understanding the nature of the pesticide and the appropriate period of control is the case of arbitrary mix two or more pesticides, and so on Not only affect the control effect, but also increased the cost of pesticides.