First, the diagnosis is wrong. When the disease is treated as a pest, the insect is treated as a disease. Such as early defoliation of trees, as a spider hazard; tomato bacterial wilt disease, misdiagnosed as underground pests biting roots and so on. This will not be effective any more.
Second, the medicine is not symptomatic. The diagnosis is correct, but the medicine is not symptomatic, such as the control of wheat scab by Jinggangmycin; the control of wheat armyworm by dicofol.
Third, the opportunity to delay. Pest control should be applied best at the peak of adult spawning or before larval hatching until the third age. If the larvae have reached the age of three, the crops have been bitten into disasters. At this time, the prevention and treatment, the application of more medicine, the effect is not good.
Fourth, the amount of medicine is not allowed. Too much or too little is not good. Excessive concentration is prone to phytotoxicity, and the concentration is too small to achieve the purpose of prevention and treatment. It must be formulated in accordance with the instructions and requirements for pesticide use in order to obtain satisfactory results.
Fifth, blind spraying. The spray should be sprayed on the vital part to receive the desired effect. While controlling cotton red spiders, it is necessary to spray the medicine on the back of the blade to receive the effect.
Sixth, the weather is not good. The efficacy is closely related to meteorological factors such as temperature, humidity, rain, dew, wind and light. If you use emulsion pesticides, there will be no rain for at least the next 24 hours after spraying, and the effect will be good. The use of stomach poisons, contact pesticides, at least two days without rain wash, in order to better play the drug. Therefore, according to the local weather forecast, the appropriate weather conditions should be selected for spraying.
Hua County Wu Limin
Second, the medicine is not symptomatic. The diagnosis is correct, but the medicine is not symptomatic, such as the control of wheat scab by Jinggangmycin; the control of wheat armyworm by dicofol.
Third, the opportunity to delay. Pest control should be applied best at the peak of adult spawning or before larval hatching until the third age. If the larvae have reached the age of three, the crops have been bitten into disasters. At this time, the prevention and treatment, the application of more medicine, the effect is not good.
Fourth, the amount of medicine is not allowed. Too much or too little is not good. Excessive concentration is prone to phytotoxicity, and the concentration is too small to achieve the purpose of prevention and treatment. It must be formulated in accordance with the instructions and requirements for pesticide use in order to obtain satisfactory results.
Fifth, blind spraying. The spray should be sprayed on the vital part to receive the desired effect. While controlling cotton red spiders, it is necessary to spray the medicine on the back of the blade to receive the effect.
Sixth, the weather is not good. The efficacy is closely related to meteorological factors such as temperature, humidity, rain, dew, wind and light. If you use emulsion pesticides, there will be no rain for at least the next 24 hours after spraying, and the effect will be good. The use of stomach poisons, contact pesticides, at least two days without rain wash, in order to better play the drug. Therefore, according to the local weather forecast, the appropriate weather conditions should be selected for spraying.
Hua County Wu Limin
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