If the biological pesticides that cannot be mixed or used alone are mixed, the effect of prevention and control of pests and diseases will be reduced, and crops will be injured. Taking cotton as an example, if the pesticides are used improperly, cotton buds, flowers, bells and peaches will be injured; In addition, some pesticides cannot be used singly, and long-term single use will make cotton pests and diseases resistant, and the effect is getting worse. It is better to alternate the use of crops.
Second, the pesticides can not be divided into pesticide performance, high efficacy and low dose. Some pesticides are only suitable for certain crops. They are used on other crops, which are not only ineffective but also harmful. Therefore, it is necessary to treat the disease according to the dose. (For example, in the second season, three generations of late rice, three generations of three mites, four generations of three mites, heartworms, 50 ml of emulsifiable concentrate per acre, 30 grams of 901 synergist, 50 grams of stagnation and 100 kg of water, in sunny afternoon 4 After the o'clock, the effect is very obvious).
Third, you should not abuse pesticides. The pesticide network knows that some farmers use drugs, do not look at the instructions for the use of pesticides, increase the concentration at will, and some rely on their old experience to estimate the use of drugs. As everyone knows, increasing the concentration at will increases the cost and kills the natural enemies of the pests. The remaining pests multiply at an extraordinary rate and can develop to a greater number than in the short term.
4. Can not ignore the aging effect, such as the control of cotton red bollworm, cotton bollworm, Spodoptera litura or two-night rice leaf roller, rice locust, rice planthopper, etc., should be used in the evening or cloudy days. When controlling four generations of three mites or three generations of mites, "whitening the ears", the grain farmers must pay attention to the fight when the leaves are a little dew, because this time is the best time to spray pesticides .
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