Control measures of Tomato Cotton Blight

Tomato is very prone to cotton blight in the process of planting, and the back of the leaf is called brown rot, which mainly occurs in rainy days and high temperature season. So how to prevent and cure tomato cotton blight? Let's get to know it with the editor.

1. Occurrence of symptoms

Cotton blight mainly harms immature fruits, first of all, a smooth light brown on the top or shoulder of the fruit, and sometimes a little white mold, or gradually become concentric wheel-shaped spots, gradually become dark brown, and the flesh under the skin also turns brown. When the humidity is high, the disease department will also appear white mildew. The diseased fruit will remain intact, not softened and easy to fall off. When the leaves are infected, they will grow water-immersed large chlorotic spots, and gradually rot, and some concentric wheel patterns can be seen.

2. Occurrence regularity

First of all, the pathogen overwintered on the ground with oospores or chlamydospores, and then splashed it on the fruit near the ground with Rain Water the next year. After germination, the pathogen would produce bud tubes and gradually invade from the pericarp. The hyphae of the later diseased parts will produce conidia and zoospores, which will be transmitted and re-infected by Rain Water and irrigation water. At the end of autumn, chamber pots have formed spores to survive the winter, and can develop between 8 and 38 degrees, with the best development of 30 degrees and humidity above 95%, so the disease is more serious in summer high temperature and rainy season or lowland and clayey land.

3. Prevention and control methods

Because of the rapid incidence of the disease and the rainy season, comprehensive prevention measures should be taken, and three years can be selected for planting Solanaceae vegetables with high terrain and good drainage. Fine soil preparation before planting, deep trench, high soil cultivation, reduction of soil water content, timely pruning and weight, removal of old leaves and bore leaves, and increase plant permeability. Plastic film mulching cultivation can prevent pathogens from splashing on plants or fruits through irrigation water. The disease can be sprayed with ethyl aluminum, metalaxyl manganese zinc, metalaxyl manganese zinc, ethyl phosphorus manganese zinc, metalaxyl copper, and other chemicals to prevent and control the disease, focusing on the protection of fruit ears, giving due consideration to the ground, and spraying within 1 hour after spraying.

The above is the introduction of the prevention and control measures of tomato cotton blight, hope to help you, want to know more related knowledge, please pay attention to us.