Three measures of pest-free vegetable pest control

1. Tobacco. Tobacco is mainly used to control aphids, mites, maggots and the like. Before the preparation, weigh the waste tobacco and water in a ratio of 1:40. First, the tobacco leaves are shredded, soaked in 10 parts of boiling water and covered. When the water temperature drops to about 20 °C, the soaked tobacco leaves will be smashed until there is no When the juice is thicker, remove the tobacco leaves, put in another 10 parts of water and continue to knead. After 4 times of changing the water, the filter residue will be taken out of the tobacco leaves, and the tobacco juices will be mixed for use in the field to prevent insects. The spraying amount per mu is about 50 kg.

2. Castor leaves. Ramie raw materials are easy to obtain, and the insecticidal effect is good. After spraying, the crops are also supplemented with organic fertilizer. This method can effectively control a variety of pests such as vegetable aphids, cabbage caterpillars, maggots, ground tigers, chafers, and diamondback moths. The ramie leaf eucalyptus juice can be added with water 3 to 5 times, soaked for 12 hours, sprayed on the leaf surface, or the ramie leaves can be dried and ground and mixed with soil, and the castor bean oil can be added with water 5 times and soaked for 12 hours. . When applying, choose to spray on sunny day and evening. When spraying, it can be used together with new high-fat film to improve the control effect and prevent infection of bacteria. Please pay attention to it.

       3. Grass ash. Grass ash is an important farmyard fertilizer, rich in minerals such as potassium, and has excellent insect-preventing effects. It can be used to control onion fly, root lice, aphids, and chafers. First, the application of soil, 30 to 40 kilograms of plant ash per acre, preferably applied to the planting ditch, after planting or planting, and then covering the soil, can prevent rhizosphere pests; second, direct application, the grass ash is ground in the morning after dew When dry, spray on the pest damage site, use 1 to 2 kg of grass ash per acre; thirdly, spray the grass ash liquid, soak 3 kg of grass ash and water 10 kg for 3 days, and spray the ash leaching solution after filtering residue.