The black rot of white peony is easy to happen in summer, generally because of the bad ventilation conditions, and it is still growing in the high humidity and high temperature environment, which will lead to the occurrence and growth of black rot. But sometimes it will be caused by scale insects.
This kind of disease can make the leaf of white peony appear black spot, enlarge gradually and make the leaf rot again, or affect the root..
When white peony is found to have black rot, it should be isolated from other plants immediately.
At the beginning of the disease, the rotten part can be cut off completely, and then some fungicides (chlorothalonil, carbendazim, etc.) can be applied on the incision, and then the incision after the application of the medicine can be dried until the sun is dried, and then the loose sand can be inserted after the air is dried..
Another easily acquired disease of white peony is bituminous coal disease, which will also affect the leaves and make them wither gradually and stop growing.
Prevention and control of bituminous coal disease can directly use drugs, that is, diluted chlorothalonil, carbendazim and other fungicides to spray, kill the virus
In the early stage of occurrence, the insect pest will propagate and grow in the root or the center of the plant. It will damage the root of the plant, bite and devour the root, and stop the growth of the plant.
Control method
After discovering insect pest, we should immediately isolate with other plants, then cut off the root of breeding scale insects, and then spray medicine to protect the root or irrigate the root to kill insect pest.
