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Shelter diseases and pests to prevent
According to reports, recently, as the temperature continues to drop, the temperature difference between day and night is large, effective light is shortened, and fruits and vegetables in the greenhouses in autumn and winter have entered a period of high incidence of diseases and insect pests. In production, one is to select resistant varieties: some varieties of hybrids are better and different varieties are used in different seasons. The second is to use grafting and seedling raising techniques on seedlings, and to increase farmyard manure, and to perform harmless treatment in the fermentation process of organic fertilizers. It is not because the lack of nutrients causes the growth of fruits and vegetables to become weaker and reduces the resistance. The third is to increase ventilation in the production process of the greenhouse, because the occurrence of pests and diseases is generally in the case of relatively high air humidity, the outlet should be adjusted to more than one meter, the bottom leaf more than half a meter to ensure air circulation There is no dew on the front of the leaves. Fourth, even if pesticides are used to prevent and treat diseases, it is not recommended to use chemical pesticides. It is best to use biological preparations, and pests also use plant preparations.