Control techniques of Gray Leaf spot in Tomato

Tomato gray leaf spot often occurs in tomato production, it will destroy the photosynthesis of leaves, reduce the yield of tomato, and bring huge losses to farmers. So how to control tomato gray leaf spot? Let's get to know it.

1. Symptoms

Tomato gray leaf spot only harms the leaves. At the beginning of the disease, the leaves are covered with dark green round or irregular round spots, then spread around along the veins of the leaves, forming an irregular shape, and the middle part fades to grayish brown. The disease spot is slightly sunken, mostly small and extremely thin, and it is easy to break and perforate and cause the leaves to break or even fall off in the later stage.

2. The cause of disease

Tomato gray leaf spot pathogen can infect tomato plants initially when the temperature and humidity reach the degree of spore growth and reproduction the earlier the disease remains and seeds in the soil. After that, the spores will spread by wind and rain and infect again, which is the peak of the disease for a long time in humid and rainy days. in addition, the lack of soil fertility will also lead to plant weakness and give bacteria a chance to take advantage of it, thus leading to plant disease.

3. Prevention and control technology

According to the occurrence characteristics of tomato gray leaf spot, take targeted control measures, first of all, do a good job of seed disinfection when raising seedlings, soak in 55 degrees warm water for half an hour before sowing, stir continuously during the period, and dry it after being fished out for other use. or soak it in low concentration potassium permanganate solution for half an hour, remove and rinse and sow seeds. Varieties with resistance to tomato gray leaf spot and virus disease should be selected in production to reduce the probability of disease in the field. It is necessary to strengthen cultivation management, strengthen the management of temperature and humidity, and properly control watering and moisture discharge, so as to create an environment that is not suitable for the growth of bacteria. The disease should be controlled in time. Methoxy acrylate fungicides and sterol biosynthesis inhibitor fungicides have strong control effect on tomato gray leaf spot.

The above is the introduction of tomato gray leaf spot control technology, hope to help you, want to know more related knowledge, please follow us.