It is a necessary measure to control pesticides and insects in greenhouses and spray pesticides. However, in actual production, the phenomenon that the use of qualified pesticides is not satisfactory is often encountered. The China Pesticide Network Xiaobian summarizes the reasons for you:
1, the medicine is not symptomatic: the diagnosis is correct, but the medicine is not symptomatic. For example, use chlorothalonil to control frost blight, use nettle to control cabbage caterpillars, and use agricultural streptomycin to control whitefly.
2, diagnosis error: disease when the insect treatment, insect treatment. If the early leaves of eggplant, tomato, bell pepper, etc., are generally samovar and spider mites harm; bacterial wilt disease, misdiagnosed as underground pest bites, etc., so no more medication will be effective.
3, the amount of drug is not allowed: too much or too little will not achieve good results. If the concentration is too large, the phytotoxicity will occur, and if the concentration is too small, the pests will not be killed. It must be formulated in accordance with the instructions and requirements for pesticide use to achieve satisfactory results.
4, the opportunity to delay: pest control, should be the best in the peak of adult spawning or larval application, otherwise the application of more drugs, the effect is poor. According to the pesticide network , the application effect should be best in the germination stage of the spores, that is, before the onset or in the early stage of the disease. If the disease has spread to disaster, it is difficult to achieve the desired effect.
5, improper use: At present, some pesticide manufacturers take the old name of the old medicine, change the packaging, lack of acid and alkaline instructions, only indicate the object of prevention and treatment. Farmers often use it with other pesticides of different nature when they are used, or they may fail or cause phytotoxicity.
6. Unfavorable weather: The efficacy is related to meteorological factors such as temperature, humidity, rain, and light. If using emulsifiable pesticides, it is best to have no rain 24 hours after spraying; use stomach poisons, contact agents, preferably 48 hours without rain.
7. Blind spray: The spray should be sprayed on the vital parts to have the desired effect. For example, in the prevention and treatment of cucumber downy mildew, pesticides should be sprayed from the bottom to the top, mainly in the middle and lower stems and leaves; in the prevention and control of powdery mildew, the stems and leaves should be buckled; the control of red spiders should be carried out on the back of the leaves; the root rot should be Mainly rooted, stem rot should be applied to the roots.
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