Tomatoes can have a variety of diseases during the entire growth and development process. If they are not controlled in time, they will lead to reduced yields and even no harvest. Therefore, the Changzhi County grass-roots agro-technical promotion reform and construction demonstration project vegetable expert group combined with the local climate and the incidence of the development of the tomato pests and diseases prevention and control technology key points for the reference of growers.
Tomato late blight
Symptom Recognition Tomatoes, also known as tomato blight, are the most common and most harmful diseases occurring in tomatoes. The disease is caused by fungi, which mainly damages the leaves and fruits, and also harms stems and petioles. It can be infected from the seedling stage to the adult stage. Infected at the seedling stage, the lesion spreads from the main stem of the leaves, and the tender stems contract and rot. The branches and leaves above the diseased part die. When the humidity is high, the white mold layer appears on the surface of the diseased part.
[Inflammation law] The disease likes the environment of high temperature and high humidity, the most suitable temperature is 18 -25 °C, relative humidity is above 95%. The most suitable period for the development of susceptible plants is the period from adult plants to fruit set, and the incubation period for disease onset is 3-5 days. Rainy year, heavy rain, low-lying terrain, poorly-drained fields, heavy planting, poor air and light transmission, and improper management of fertilizer and water
ã€Prevention and Control Methods】 1. Rotation: More than 3 years of rotation with non-solanum crops;
2. Remove the diseased body, remove the diseased fruit timely in the season of disease, and promptly remove the diseased body after harvest;
3. Cultivation Control: Strengthen field management, improve plant disease resistance, and watering is easy to carry out in sunny days to prevent flooding. After cultivated and cultivated in protective field, the plants shall be ventilated and drained in a timely manner, reasonably densely planted, timely pruned and forked, and the lower leaves of the plant shall be removed to improve the ventilation and light transmission conditions, and to increase the amount of air release under the premise of ensuring the humidity;
4. Control of chemicals: In the early stage of disease, 800-1000 times of spray is sprayed with 72% Pyrosinidium net wettable powder and sprayed once every 7-10 days for 3-4 times.
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