Symptoms and Chemical Control of Tomato Acid Rot

At present, symptoms only occur in a few areas. It is only harmful to fruits, and most of them are overripe fruits, especially those with wounds are the most susceptible to disease. The part of the disease softens, the epidermis turns brown, wet rot wrinkles, and there are fine cracks. Sparse white mildew appeared on the surface of the disease when the humidity was high. In the end, the diseased fruit is dripping, rotten and sour. The pathogens overwintered by mycelium in soil or by conidia attached to greenhouse, greenhouse frame or utensils. Conidia spread by airflow and invade from the wound or weak parts of vitality to cause the disease. The pathogen is highly saprophytic and can spread if it comes into contact with healthy fruit after harvest or in the process of storage and transportation. 2328 ℃, the relative humidity of the shed is more than 85%, which is beneficial to the disease. It is easy to get sick when there are many wounds or a large amount of storage and transportation. Control method ① Agricultural measures when tomato is cultivated in the greenhouse, the cultivation method of high border covered with plastic film should be adopted, and attention should be paid to ventilation and humidity reduction. When cultivated in open field, it should be drained in time after rain to reduce the humidity in the field. When the fruit is ripe, it should be harvested in time and fine to avoid the wound of the fruit. Control cotton bollworm and other boring pests and eliminate them before drilling fruit. After harvest, remove the injured fruit and diseased fruit. ② medicament prevention and cure should be carried out in time at the initial stage of the disease, which can be prevented by spraying 70% mancozeb wettable powder 500x, or 75% chlorothalonil wettable powder 600x liquid, or 30% Lvdebao wettable powder 400x liquid, or 77% chlorhexidine wettable powder 500x liquid, or 14% ammonia copper wettable powder 400x liquid spray.