Diagnose the wrong disease when the disease is treated, and the insect is treated as a disease. If the early deciduous disease of the fruit tree is used as a red spider, the tomato bacterial wilt disease is misdiagnosed as a ground pest and bite root dead seedlings. This will not be effective any more.
The medicine is not diagnosed correctly, but the medicine is not symptomatic. For example, the control of wheat scab by Jinggangmycin and the control of wheat armyworm by dicofol.
Delaying the opportunity to control pests, the best effect is applied at the peak of adult spawning or before the larvae hatch to the third age. If the larva is more than three years old, the crop has been seriously harmed. At this time, the prevention and treatment, the application of more medicine, the effect is not good.
It is not good to use too much or too little drug. 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 good results.
Blind sprays should be sprayed on the vital parts to receive the desired results. In the prevention and control of cotton red spider, it is necessary to spray the liquid on the back of the blade to obtain better control effect.
The adverse effects of the weather are 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.
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