Spring pests and diseases should be prevented

Improving the disease resistance of vegetable crops In the production of pollution-free vegetables, pests and diseases are inevitable. First of all, we must start from cultivation management and improve the health and disease resistance of vegetable crops through agronomic measures.

1. Selection of pest-resistant varieties: Selection of disease-resistant and insect-resistant varieties is the most economical and effective method for controlling plant diseases and insect pests. It is necessary to select new varieties of excellent pest-resistant insects according to local conditions. To understand market information and new research results, new varieties of pest-resistant varieties should be selected as soon as possible.

2, cultivate strong seedlings: disinfection of the nursery bed soil, to achieve no pathogens, no insects, no weed seeds. The nursery bed soil should be cultivated with more organic matter, nutrient elements, water retention, fertilizer conservation and permeability. In spring, nursery should strictly control environmental conditions and seedling pests and diseases, and cultivate strong seedlings.

3, grafting disease prevention seedling: due to cucumber blight, cucumber blight and eggplant root rot, eggplant blight and other diseases are difficult to control soil-borne diseases, posing a great threat to vegetable production. For this reason, cucumber, watermelon and eggplant grafting seedlings should be generally promoted. It not only prevents diseases, but also increases plant growth and stress resistance, and improves yield and quality. Problems to be paid attention to in grafting seedling technology: First, choose the rootstock type. Cucumber, winter melon and bitter gourd are commonly used as black root pumpkins as rootstocks. The rootstock of eggplant is commonly used as a rootstock in China. The second is to coordinate the seeding period of the rootstock and the scion, mainly because the seedling size of the rootstock and the scion are not disparate, and the survival rate of grafting is guaranteed.

Eight methods of pest control for pollution-free vegetables

First, the grass ash liquid to control the insects. Each acre is immersed in 10 kg of grass ash for 50 hours with 50 kg of water, and the filtrate is sprayed to effectively control aphids and yellow worms. If a proper amount of trichlorfon is added to the ash of the grass, the contact fumigation effect of the liquid can be enhanced. If onions, garlic, and leeks are harmed by fly maggots, 30 kilograms of grass ash per acre is applied, which not only cures cockroaches but also increases production.

The second is the urine washing agent for the treatment of vegetable mites. The washing agent, urea and water are prepared in a ratio of 1:4:400 to control Laiwu, and the insecticidal rate is over 90%.

The third is the brown sugar liquid to prevent and cure diseases. Take 300 grams of brown sugar dissolved in 500 ml of clear water, add 10 grams of yeast, place in a greenhouse or greenhouse, stir once a day, ferment for 15 days to 20 days, after the white film layer appears on the surface, add the fermentation broth to rice vinegar. 100 grams of shochu, 100 kg of water, every 10 days, even spray 4 times ~ 5 times, special effects of cucumber bacterial leaf spot and gray mold.

Fourth, DT fungicides prevent diseases. Prevention and treatment of cucumber bacterial angular spot disease, before the onset or early onset, spray DT bactericide 500 times solution, 75 kg per acre of liquid, spray once every 10 days, for 3 consecutive times. Prevention and treatment of eggplant verticillium wilt after eggplant planting and slow seedling, using 300 times 300 times liquid, once every 7 days, even irrigation 2 times.

The fifth is to fight against the disease. Anti-drying is used to control cabbage, pepper, tomato, celery, lettuce and melon wilt, leaf spot, and blight. The control effect is over 95%. Spray, root, and soak. Spray 20 kg of water per 20 ml, spray 3 times during the whole growth period. Dilute the roots every 20 ml to 20 kg of water to dilute. Immerse seeds for 15 kg per 20 ml of water, soak seeds for 12 hours, remove them, wash and dry them, and sow them.

Six is ​​the vegetable Fengning to prevent diseases. The drug has a 90% control effect on soft rot of Chinese cabbage, potato, radish and other vegetables, and is generally sprayed with 1 bag per acre.

Seven is 8010 bacteria powder to control insects. The bio-pesticide is highly efficient and non-toxic. When used, it is sprayed with 400 kg of water per 500 g, which can control the cabbage caterpillar and the diamondback moth, and the control effect is over 95%.

Eight is the insecticide of the larvae No. 6 liquid. 25 ml per bottle, diluted 500 times when used, can control pests such as cabbage caterpillar, diamondback moth, aphid, and Spodoptera litura.

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