What are the causes of tomato brown spot disease?

Pathogen and regularity of tomato brown spot disease: (1) pathogen.

Tomato brown spot is a fungal disease, which is infected by Hemiptera and Helminthosporium.

(2) infection cycle.

Tomato brown spot overwinters with hyphae or conidia in the diseased soil, and conidia are produced in the following year. The conidia invade the host tissue through stomata, lenticels or wounds, and spread through airflow and rain. Primary infection and reinfection.

(3) Pathogenic conditions.

The optimum growth temperature of the pathogen is 25 ~ 28 degrees Celsius, and spores can germinate after about 2 hours in water. The rainy season is severe, and high temperature and humidity are conducive to the occurrence of diseases. In addition, the low terrain, poor drainage, weak plant growth, prone to diseases.