Exhaustion disease: It mainly occurs in the seedling stage. After becoming infected, the base of the stem at the junction with the soil surface is constricted and lodging. The pathogen infects healthy plants with running water and spreads quickly. It is a common disease in the seedling stage. a serious disease. Prevention and control methods: Choose new soil to raise seedlings, and disinfect the soil with sterilate or promethazine before sowing; pull out the diseased plants as soon as possible, and spray them with 1:1.2:100 Bordeaux mixture or 1500 times of promethazine, which can play a certain preventive and control role.

Rotten flower and fruit disease: It is easy to occur in high temperature and rainy seasons. The base of the inflorescence and the exposed part of the fruit will show water-soaked gray patches. When aggravated, the skin will turn dark brown and the fruit shell will burst. The young seeds turn beige and rot, spreading until the entire inflorescence dries up and dies. Prevention and control methods: Pay attention to drainage; choose a higher place for planting.

Leaf spot disease: Both seedling and mature plants will be affected. The bacteria invade the leaves and carry out repeated infections with running water. Prevention and control methods: Choose a new site to raise seedlings, and spray infected plants with 500 to 1000 times of Anthracnose or Daconin 1500 times.