In recent years, the gray mold of vegetables in protected areas has become increasingly serious, resulting in rotten and rotten leaves, and the quality of products has declined. Generally can reduce production by 20% -50%.
Botrytis cinerea mainly damages tomato, cucumber fruit and amaranth leaves. The bacteria invade from the fruit, the flowering potato or the tip of the leaf. In the early stage of disease, water-soaked plaques appeared on the top of the fruit or fruit shoulders and gradually turned white and rot. In the later stage, a gray mold layer appeared in the disease minister. Leaf lesions mostly extend inward from the leaf margin in a "V" shape. The lesions are initially immersed in water and later become light brown. There are dark and light ring veins on the edges (approximately 2-4 mm in diameter can be formed on the leeks. Shaped white spots or dry tips. There is a small amount of gray mold on the surface, which can seriously cause the leaves to die. This disease spreads with air currents and rainwater. Farming operations in the fields such as tomato flowers and leek harvest are all important routes of transmission. The pathogenic bacteria require high humidity (above 90% relative humidity), suitable temperature 20-23°C, extremely low temperature resistance, high temperature resistance, generally cloudy days, low temperatures, improper ventilation, and sheds during 3-5 months. When the humidity is too high, the disease spreads quickly.
Control methods:
1. Ecological control. Shed temperature can take a large temperature difference temperature management. In the morning and evening of late morning and evening, the temperature of the shed quickly rises, and when the temperature rises to 33°C, the top wind is released, so that the temperature of the shed can be reduced to about 25°C (the temperature of the leeks can be reduced to 20°C), which can accelerate the dewfall and reduce the gas in the shed. Wetness is fast; the temperature in the afternoon canopy is maintained at 20-25°C, and when the temperature drops to 20°C, the tuyere is closed; the temperature in the night canteen is maintained at 15-17°C (amaranth can be above 10°C). Cloudy weather should also be ventilated. This kind of management measures can delay the germination and growth of pathogens compared to conventional management (exhausting at 25°C, closing at sheds at 17-18°C) and hanging on cloudy days, delaying the production of spores, inhibiting and spreading well, and It is conducive to vegetable growth, increase production and income.
2. Combined with chemical anti-lift. Sites with severe onset of disease, such as the use of 10% chlorothalonil smoke agent or 10% fast-kerosene smoke agent on a cloudy day for 200 grams per acre for smoked sheds, can also be used to spray dust. Sunny days can be used 50% Park Hyland or 50% quick-king 1500-2000 times spray, spray 7-10 days once, continuous 2-3 times.
In order to improve the control effect, attention should be paid to the use of drugs at critical times, such as tomatoes and cucumbers, in the flowering phase and the expansion phase of leccinum and after the first cutting of leek, several agents are used interchangeably.
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