Prevention and control of diseases and insect pests in greenhouses are currently focused on the spraying of pesticides, but in actual production, the phenomenon of using unqualified pesticides is often unsatisfactory. The reasons are as follows: Misdiagnosis Disease when the insects, insects when the disease. Such as eggplant, tomato, pepper and other early defoliation, under normal circumstances for tea aphid, spider mite damage, if misdiagnosed as underground pest bites and other reasons, so "symptomatic", medication will not work more. Drugs are not symptomatic The diagnosis is correct, but the medicine is not correct. Such as the use of chlorothalonil prevention and control of frost blight, the use of fleas net control of cabbage caterpillar, with agricultural streptomycin control whitefly and so on, are all medicine is not symptomatic. Missed opportunity Insect pest control should be the best in the adult egg laying peak period or larval stage application, otherwise the application of pesticides, the effect is poor. Prevention and treatment of diseases should be performed at the germination stage of the spores, that is, before the onset of the disease or at the early stage of onset of disease, and the effect is best. If the disease has spread to the disaster, it is difficult to obtain the desired effect after spraying the medicine. Dosage is not allowed Too much or too little medication will not achieve good results. Excessive concentrations of phytotoxicity occur. Too small concentrations do not kill pests. Must be formulated in accordance with pesticide use instructions and requirements. Misuse At present, some pesticide manufacturers take new drugs, change the packaging, lack of acid and alkalinity instructions, and only indicate the control objects. When farmers use pesticides, they often mix with other pesticides of different nature, causing pesticides to fail or cause phytotoxicity. Blind spray When sprayed on the critical area, it will have the desired effect. Such as the prevention and treatment of cucumber downy mildew, should be sprayed from the bottom up, mainly in the middle and lower stems and leaves; prevention and treatment of courgette powdery mildew, should be deducted spray stems and leaves; control of spider mites, spray care blade back; Root rot should be to irrigate In the main, stem rot should be soaked in the roots. weather reason The efficacy is related to meteorological factors such as temperature, humidity, rain and light. If EC is used, it is best to use no rain for 24 hours after spraying. For stomach poisons and contact poisons, it is better to use no rain for 48 hours. Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshihealths.com