How to Treat Root and Leaf Rot in Pinellia? Detailed Prevention and Control Methods

Pinellia is a medicinal plant of the Araceae family, also known as three-leaf pinellia and half-moon lotus. Its medicinal part is the tuber. It grows wild throughout China and has the effects of drying dampness and transforming phlegm, and redirecting rebellious qi to stop vomiting. So how do you treat root and leaf rot that occurs during the cultivation of pinellia?

1. How to Treat Root and Leaf Rot

First, chemical treatment: use the fungicides hymexazol, ethylicin, zhibingqing, and a rooting agent, mix with 100 jin of water for root drenching.

Second, treat the soil: for one mu of land, use 1200 grams of microbial inoculant, dilute in 800 jin of water, and apply by drip irrigation. Using the above two methods, the seedling survival rate is over 90%.

2. Causes of Root and Leaf Rot in Pinellia

It occurs during high temperatures, the rainy season, prolonged excessive soil moisture, and the tuber and bulbil enlargement stage. In the early stage when pathogens infect the pinellia tuber, irregular black spots appear around the tuber, and these spots rapidly expand outward. After 3—4 days, numerous pathogen spots join together and continue to infect the interior of the tuber. At this point, the pinellia root system begins to shrink, and the aboveground leaves gradually turn from green to yellow and wither. After 1 week, the pinellia tuber becomes round and blister-like, resembling overripe grapes, and the inside of the tuber is entirely black water. The whole plant dies, and ** only a thin outer skin remains. The spreading pathogens quickly infect other pinellia tubers, causing the entire pinellia plot to become infected and rot within a short period. The large tubers rot first, then the rot spreads to the small tubers. This disease is also currently a common, difficult-to-treat, highly damaging, and widespread disease in artificially cultivated pinellia.