Control of main diseases of greenhouse vegetables

Botrytis cinerea is the most common and severely harmful disease in greenhouses, especially for eggplant, tomato, pepper, cucumber and kidney bean. Generally, the incidence is heavier before and after flowering. The disease is a low-temperature type disease, and the onset is rapid and severe under conditions of 10°C to 15°C, rainy days, and high humidity. Prevention and control measures: Clear water drains, timely ventilation and other work. At the beginning of the disease, 50% fast keratin, 25% ash, 50% acetaminophen, 25% polymysid, 10% difenoconazole, or 20% pyrimethanil were used. Can also be used at the beginning of the disease, the use of shy grams, fast-king, chlorothalonil powder mixed with wood chips (a drug plus 50 pieces of wood chips), ignited smoke, to 30 cubic meters of greenhouse drug dosage 0.3 kg, control efficiency it is good.

In addition to endangering eggplants, the M. blight epidemic also harms cucumbers, wax gourds and legumes. The damage to eggplant is more severe due to the prosperous period, and it mainly damages the fruit. At the early stage of disease, the fruit surface is immersed in round spots. After the enlargement, the lesion becomes yellow-brown, the disease part is slightly sunk, and the fruit decays and turns black, and the disease is easy to fall off. . If there is continuous rain during the result, it should be used as a key point for the prevention and control of eggplant diseases. The medicine can choose 78% MnZn, 20% carbendazim, 72% MnZn urine (Kelu), 64% antivirus, 68.7 % EPC, 50% Dimethomorph, 58% Methanozinc, 25% Metalaxyl, etc.

Downy mildew The disease is the most important disease that damages cucumbers and mainly damages the leaves. The leaf appeared as a water-stained light green spot at the beginning of the leaf, and the spot quickly turned brown after drying at high temperature. The onset of illness requires high temperature and high humidity conditions. Therefore, the peak incidence of cucumber downy mildew is generally in the middle and late May, and this is also the fruitful period of cucumber fruiting. The prevention and treatment of cucumber downy mildew should focus on the first half of May (before high temperature and high humidity), and the agent can be selected from 72% Kelu, 58% Ledomil, 70% can be killed, and 72% Prokary (Perkinam). Chlorothalonil smoke agent (seeding period).

Anthracnose The disease is one of the major diseases that harm chili peppers, and it also harms eggplants, tomatoes, melons and legumes. Commonly known as defoliation, according to the size of the black spots that occur on the lesions, orange-red dots are divided into black anthrax, black spot anthrax, and red anthrax. High temperature and heavy rainfall, poor drainage, high planting density, improper fertilization, excessive nitrogen fertilizer, and poor ventilation all aggravate the occurrence and prevalence of this disease. The prevention and control of hot pepper anthracnose should be carried out at the beginning of May, with emphasis on prevention and control from June to August. The agent can be selected from 75% chlorothalonil, 87% mancozeb, 50% thiophanate-methyl, and 64% anti-virus.

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