Symptoms can be infected at the seedling stage and the adult stage, mainly affecting leaves, stems, flowers, and fruits. In the early stages of the lesion on the leaves, it was spotted as water-stained brown spots. It was round after enlargement. It had concentric ring patterns and became black when wet. On the stems, brown ellipsoidal spots were formed at the nodes; Spots, dark brown or black, generally do not wrap the stems; fruits occur at the fruit pedicle, forming brown or black concave patches, a ring pattern, easy to cause fruit drop.
Control methods to strengthen management: seed disinfection before sowing, with 50 °C ~ 55 °C warm water for 15 to 20 minutes. Closely plant the plants and implement rotation for more than 3 years. In the greenhouse, ventilation, cooling and dehumidification should be strengthened to avoid high humidity environment. Chemical control: Continuous medication during the growth period, can be sprayed with mancozeb 500 times, or 64% antiviral 400 times, or 57% chlorothalonil wettable powder 600 times, or 50% acetaminophen 1000~1500 Double fluid, used in the early stage of disease, once every 6~7 days, even spray 3~4 times.