August and September are the concentrated periods of pests and diseases of crops such as cotton, rice and corn, and also a key period for the prevention and control of pests and diseases. In the field, some middle-aged and old-aged farmers will suffer economic losses due to improper use of drugs, pollution caused by crops and environmental pollution during the recent high-temperature drought and hot weather. The Chinese Pesticide Network Xiaobian collects relevant scientific methods for this situation, as follows:
First, it cannot be mixed or used alone. When some pesticides are mixed, the effect of pest control will be reduced, and cotton buds, flowers, bells and peaches will be injured. Some pesticides cannot be used alone. Long-term single use will make cotton pests and diseases resistant, and the effect is more and more effective. difference. According to the author's experience, from August to September, the prevention and control of cotton pests in the middle and late stages should be used alternately.
Second, it is impossible to blindly use pesticides without any pesticide performance or efficacy. Some pesticides are only suitable for some crops and are used on other crops. They are not only ineffective but also harmful. Therefore, it is necessary to treat the disease and dose it. (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, the timeliness cannot be ignored. For example, from August to September, 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 on cloudy days. When controlling four generations of Sanhuan or three generations of aphid "sucking white ears", the grain farmers must pay attention to the best time to fight when the leaves are a little dew.
Fourth, pesticides should not be abused. A few days ago, when I saw some farmers using drugs, I did not look at the instructions for pesticide use, and increased the concentration at will, and some estimated the use of drugs based on their old experience. 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.
The pesticide network reminds the majority of farmers that the first thing to understand before using the medicine is to use the medicine to improve the efficacy.
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