On March 14, when the reporter interviewed Mujiaba Village in Yongle Town, Yilong County, he met Zhao Wenjun, the senior agronomist and head of the Agricultural Bureau of the County Agriculture Bureau, to give training courses to the farmers.
A farmer surnamed Li asked: “My tomato has been planted for 10 days, not long, the plant was gray-green, there are a lot of defects, may I ask how is it?†He said that this is a typical late blight. Tomatoes are also known as tomato blight, and leaves, stems, and fruits can be affected. Leaf victim usually begins with the tip or leaf margin of the middle and lower leaves, and then gradually spreads to the upper leaves and fruits. The initial stage is dark green irregular water-stained lesions. There is no clear boundary between disease and health. It is prone to occur when the air is wet, and the lesions spread rapidly, with a layer of white mold on the edges of the lesions on the back of the leaves. When the air was dry, the lesions were green-brown and then dark brown and gradually dried off. The stalk was damaged, the diseased part was water-stained, and it sag slightly downwards and then became brown. The diseased stem tissue became soft, the plants wilted, and the severe diseased part was broken, causing the stems and leaves to die.
Tomato late blight is a low-temperature, high-humidity disease. The air temperature in the greenhouse is 22°C-24°C during the day and 10°C-13°C during the night. The relative humidity of the air is more than 80% to infect the plants. Due to the rapid development of the disease, everyone must spray medicine as soon as possible. The specific operation is as follows -
The choice of drugs. It is best to use fast-acting (52.5% ketoxacin-urea cyanide) wettable powder 2000 times liquid with good results. It can also be used with 72% Kelu (Molybdenum Manganese Zinc) wettable powder 600 times liquid, as well as ank manganese zinc, precore, metalaxyl, anti-virus and other agents spray control, every 7 to 10 days once, continuous Control 3 to 4 times, can effectively control the hazards of the disease.
Pay attention to the points when fighting drugs: First, the time must be in the morning. In the afternoon, when the medicine is sprayed, the water does not spread out and the humidity is high, which is detrimental to disease prevention. Care must be taken to ensure that the first two drugs can only be separated by two or three days, and then can be 5 to 7 days. In addition, the greenhouse temperature should be increased.
Be sure to leave collaterals underneath dark spots when you snoring. Otherwise, after the disease continues to develop, the branches on the top of the lesions may not remain, and it may cause the disease to continue to develop.
Through reasonable rotation with non-solanum crops, selection of disease-resistant varieties, disinfection of seeds and seedbeds, and enhancement of cultivation and management measures, the harm can be mitigated.
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