How to prevent and control vegetable pests and diseases during the winter?
As the weather gets colder, many people have neglected the prevention and control of vegetable pests and diseases. In fact, the colder the day, the more it is necessary to strengthen the prevention and control of vegetable pests and diseases, whether it is open field vegetables or greenhouse vegetables. The following small series talk about the prevention and control of pests and diseases of vegetables in open fields and vegetables in greenhouses.
First, open vegetables
In winter, the vegetables in the open field are mostly cruciferous, and the cruciferous vegetables are most serious in winter, with aphids and downy mildew. The most common, such as dry and sunny in winter, is conducive to the occurrence of aphids, and the aphids will be heavy, such as winter rainy days. More, it is conducive to the occurrence of downy mildew.
1, downy mildew. It mainly harms Chinese cabbage and lettuce. If the winter is dry, the general problem is not big. If it is continuous and rainy, commonly known as “bad winterâ€, downy mildew will occur widely, and the leaves of the lower part of the crop (basic) are generally yellow, causing vegetable stagnation. ,even death. It can be prevented by metalaxyl, mancozeb or thiram.
2, mites. Aphids are the most important and necessary pests on winter exposed vegetables. It is necessary to pay special attention to the fact that the authoritative department expects this year to be warm and warm, which will aggravate the occurrence of pests and diseases, especially the damage of aphids. Control drugs: acetamiprid or imidacloprid or pyrethroid pesticides .
Second, greenhouse vegetables
Due to the high humidity and high temperature in the greenhouse, the disease is widespread and the incidence is heavy. Therefore, controlling the disease is the key to the success of greenhouse vegetables. The greenhouse is mainly the fruits of the autumn extension, and the main disease types vary according to the cultivar and management conditions, mainly due to diseases, anthracnose, powdery mildew, soft rot, downy mildew, and gradually with fruits and vegetables. After harvesting, the vegetables in the greenhouse will gradually increase, and gray mold, anthracnose, and blight will occur. The prevention and control of greenhouse diseases should be strictly controlled, especially in the seedling stage and flowering stage. The prevention and control strategy should be adopted. The prevention and control strategy should be carried out every 7-10 days. It is found that the diseased branches and diseased leaves should be harvested and burned in time, such as heavy disease and high humidity. Changed to smoke control. The insects in the greenhouse in winter are mainly aphids. Because they breed quickly in the shed, and cause wounds and spread the virus, they are found to be promptly treated. Warm winter gas will also increase the risk of pests and diseases of vegetables in large sheds. Vegetable farmers must attach great importance to it.
Control drugs: 86.2% cuprous oxide water-dispersible granules or 20% thiabend copper suspension can be used for the disease; 15% triazolone wettable powder can be used for powdery mildew; 50% procymidone WP can be used for gray mold; anthracnose 50% Fu·Fu Zinc WP or chlorothalonil can be used.
More pesticide knowledge , please pay attention to China Pesticide Network
Aluminum Corrugated Sheet For Building Roofs
Aluminium Sheet Design,Diamond Tread Aluminum Sheet,Aluminium Checker Plate Suppliers,Aluminium Checker Plate Cut To Size
Jinan Xinhai Aluminum Industry Co., LTD. , https://www.jnxinhai-alu.com