1. Symptoms: the disease mostly occurs in the growing period, mainly affecting the stem base of Ranunculus japonicus, making it produce white silky hyphae. The hypha gradually twined to form a rapeseed like sclerotia. When the disease is serious, the stem base of the plant will rot and necrosis, the branches and leaves will wither, and finally the whole plant will die.
2. Prevention and control method: destroy the infected plant immediately. Then spray the plants with Carbendazim and irrigate the soil to control the propagation of bacteria and alleviate the disease.
1. Symptoms: dark brown or black root. When the disease is serious, the surface of diseased tuber is covered by conidia of Penicillium, and it is easy to infect healthy tuber.
2. Prevention and control method: check carefully before planting. If any infected root block is found, it shall be cleaned, burnt or buried in time. Before planting, the tuber root with pathogen should be removed strictly, and soaked with 75% metoclopramide 800 or 1000 times solution for 10-15 minutes, and then planted after drying to reduce the possibility of disease occurrence.
1. Symptoms: the disease is transmitted by leafminer. After the disease, the leaf atrophy became smaller and thicker. The disease also causes the leaf margin to roll and the petiole to become shorter. The diseased flowers will be distorted and cannot bloom normally. When the damage is serious, the disease plant obviously dwarfs, even shrinks and dies.
2. Prevention and control methods: disease and insect control should be carried out after the disease. To eliminate the virus with bike, and to kill the leaf miner with pyrazol, dimethoate and other drugs.
