Control techniques of diseases and insect pests of Platycodon grandiflorum

Platycodon grandiflorum likes cool climate, cold resistance and sunshine, so it is suitable to be cultivated in hilly areas below 1100 meters above sea level, half-taken and half-sunny sandy loam, and the neutral sandy soil rich in phosphorus and potassium fertilizer grows better, so it is a widely planted traditional Chinese medicine. Let's take a look at the pest control techniques of Platycodon grandiflorum.

Root rot of Platycodon grandiflorum

[hazard characteristics] the roots were damaged, and black and brown spots appeared in the damaged roots, which rotted to the death of the whole plant in the later stage.

[control method] ① irrigated the disease area with carbendazim 1000 times solution. ② pay attention to drainage after rain, the field should not be too wet.

Platycodon grandiflorum powder disease

[hazard characteristics] the main damage to leaves. At the time of onset, the diseased leaves were covered with ash powder, which was so serious that the whole plant withered.

[prevention and treatment] at the beginning of the disease, the disease was sprayed with Baume 0.3 degree stone sulfur mixture or Baifenjing solution or 1800 times solution of 20% trimethoprim powder.

Platycodon grandiflorum root nematode disease

[hazard characteristics] when harmed, there were diseased protuberances in the roots and early withering of stems and leaves on the ground.

[control method] applying 1500kg/ ha tea seed cake fertilizer as base fertilizer can reduce the harm and disinfect the soil with lime nitrogen or dibromochloropropane before sowing.

Platycodon grandiflorum purple plume disease

[hazard characteristics] the damage was serious in the middle of September and the root rotted in October. The damaged roots turned red at the initial stage and were covered with reticulated reddish-brown hyphae. In the later stage, the purple sclerotia of mung bean was formed, and the stems and leaves withered and died.

[prevention and control methods] avoid continuous cropping, implement crop rotation, remove diseased plants and burn them, and disinfect the diseased points with 5% lime water.

Anthracnose of Platycodon grandiflorum

[hazard characteristics] it was easy to occur and spread rapidly in high temperature and humidity from July to August, and the plants lodged and died, mainly harming the base of the stem. Brown spots appeared at the base of the stem at the initial stage, which gradually expanded around the stem, and the diseased part contracted and the plant lodged in the later stage.

[control method] spray prevention with 500-fold solution of 20% bacilli wettable powder before unearthed seedlings, spray 1-100 Bordeaux solution or 50% methyl thiophanate wettable powder 800-fold solution at the initial stage of the disease, once every 10 days, 3 times continuously for 4 times.

Ring streak and spot blight

[hazard characteristics] damage leaves.

[prevention and treatment methods] at the initial stage of the disease, 1000-fold solution of 100 Bordeaux solution or 50% carbendazim wettable powder was sprayed continuously for 2 times 3 times.

Platycodon grandiflorum

[damage characteristics] damage to the roots of Platycodon grandiflorum, larvae can not only damage the newly sown seeds and crop seedlings that will be unearthed, but also bite off the rhizomes of the seedlings, resulting in lack of seedlings and broken ridges.

[control methods] during the adult mating period from March to April and the larval stage from May to June, it was sprayed with 1000 times of 90% trichlorfon or 50% phoxim EC.