Prevention and treatment of two major diseases of Codonopsis pilosula

Root rot and rust are the two most common diseases in the cultivation of Codonopsis pilosula, these two diseases seriously affect the planting efficiency of Codonopsis pilosula, so how to control these two diseases respectively.

Codonopsis pilosula root rot:

Symptoms of root rot of Codonopsis pilosula: it often occurs during the period of high temperature and humidity from May to June in summer. It mainly occurs in the plants of Codonopsis pilosula in the growing period of more than 2 years. In the early stage of the disease, the lateral root and whisker root near the ground turned dark brown. When there were many Rain Water and the disease was serious, the root system rotted and the plant withered, which seriously affected the yield.

Prevention and control of root rot of Codonopsis pilosula: ① timely drainage in high temperature and rainy season to prevent stagnant water in the field. ② found that the diseased plant should be removed and disinfected the acupoint with 5% lime emulsion to prevent spread. When the area of ③ is large, 50% carbendazim 500x solution can be used to irrigate the disease area. ④ combined with soil preparation, 70% pentachloronitrobenzene powder 1 kg per mu for soil disinfection. At the beginning of the onset of ⑤, 50% topiramate was sprayed 2000 times or drenched the root, once every 10 days for 2 consecutive times. ⑥ implements crop rotation with different families and genera such as soybean, wheat, corn and so on.

Codonopsis rust

The symptoms of Codonopsis rust occur from July to August every year, mainly harming leaves and stems. The back of the diseased leaf was raised with yellow spots, which broke and scattered orange-yellow powder in the later stage, which withered the leaves or fallen leaves in the early stage. When the disease is serious, the yield of ginseng root is reduced more.

The prevention and control of rust of Codonopsis pilosula: ① cleared the garden and burned the diseased and residual plants after withering in winter. At the initial stage of the onset of ②, 50% dinitrate powder was sprayed with 200x solution or 97% sodium dichromate solution with 400x solution, once every 7ml for 10 days, for 3 times in a row, or with 25% chlorphenamine 1000Mel 1500 times solution for prevention and treatment. ③ set up the support in time to change the ventilation condition and reduce the field temperature.