The core content: prevention and control of greenhouse pests and diseases, often sprayed pesticides, but the effects of qualified pesticides after use are not ideal:
When spraying pesticides to control pests and diseases of greenhouse vegetables, the phenomenon of using qualified pesticides may not be satisfactory. What are the reasons? China Pesticide Network Xiaobian for your analysis:
First, the diagnosis of the disease is the treatment of insects, insects and diseases. Such as eggplant, tomato, bell pepper and other early leaves, under normal circumstances is the samovar, red spider pest damage, if misdiagnosed as underground pests bite roots and other reasons, so "symptomatic", the drug will not be effective.
Second, the pesticide is not diagnosed correctly, but the medicine is not symptomatic. For example, using chlorothalonil to control frost blight, using net sputum to control cabbage caterpillars, and using agricultural streptomycin to control whitefly mites, etc., are all medicines that are not symptomatic.
Third, delaying the opportunity to control pests, should be the best in the peak period of adult spawning or larval application, otherwise the application is more, the effect is poor. Prevention and treatment of diseases should be applied during the germination period of the spores, that is, before or at the onset of the disease. The effect is best. If the disease has spread to disaster, it is difficult to achieve the desired effect.
Fourth, the amount of drug is not allowed to use 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. Must be formulated in accordance with the pesticide instructions and requirements.
V. Improper mixing At present, some pesticide manufacturers take the old name of the old medicine, change the packaging, lack the explanation of acid and alkali, and only indicate the object of prevention and treatment. When farmers use pesticides, they often mix with other pesticides of different nature, causing pesticide failure or causing phytotoxicity.
6. Weather Causes The efficacy of the drug 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.
Seven, spraying drugs blindly sprayed on the vital parts, will have the desired effect. For the prevention and treatment of cucumber downy mildew, it should be sprayed from the bottom to the top, mainly in the middle and lower stems and leaves; in the control of zucchini powdery mildew, the stems and leaves should be buckled; the control of red spiders should be carried out on the back of the spray; the root rot should be rooted Mainly, the stem rot is to wet the roots.
Pesticide manufacturers remind everyone that when the pesticide is not used to achieve the desired effect, it is necessary to carefully find the cause and change the method in time to improve the efficacy.
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