How to prevent and control pests and diseases of Platycodon grandiflorus? Latest technical method tutorial

Platycodon grandiflorus prefers a cool climate, is cold-tolerant and sun-loving, and is best cultivated in hilly areas below 1100 m in altitude, in semi-shaded sandy loam soil, growing best in neutral sandy loam rich in phosphorus and potassium fertilizer. It is a relatively widely planted Chinese medicinal herb. Below, let us take a look at the pest and disease control techniques for Platycodon grandiflorus!

Platycodon grandiflorus root rot

[Damage characteristics] It harms the roots. Black-brown spots appear on the affected roots, and in the later stage they rot until the whole plant dies.

[Control methods] 1. Irrigate the diseased area with a 1000-fold dilution of carbendazim. 2. Pay attention to drainage after rain; the field should not be too wet.

Platycodon grandiflorus powdery mildew

[Damage characteristics] It mainly harms the leaves. When the disease occurs, the diseased leaves are covered with gray powder, and in severe cases the whole plant withers.

[Control methods] At the initial stage of the disease, spray with 0.3 degree Baume lime sulfur mixture or a 500-fold dilution of Baifening, or spray with a 1800-fold dilution of 20% triadimefon powder.

Platycodon grandiflorus root nematode disease

[Damage characteristics] When affected, the roots have diseased protrusions, and the aboveground stems and leaves wither early.

[Control methods] Apply 1500 kg/hectare of tea seed cake fertilizer as base fertilizer, which can reduce the damage. Before sowing, disinfect the soil with calcium cyanamide or dibromochloropropane.

Platycodon grandiflorus violet root rot

[Damage characteristics] The damage is severe in mid-September, and the roots rot in October. The affected roots initially turn red, densely covered with net-like reddish-brown mycelium, and later form purple sclerotia the size of mung beans, and the stems and leaves wither and die.

[Control methods] Never practice continuous cropping; implement crop rotation; pull out diseased plants and burn them, and disinfect the diseased holes by pouring in 5% lime water.

Platycodon grandiflorus anthracnose

[Damage characteristics] It is prone to occur during high temperature and high humidity in July to August, spreads rapidly, and plants lodge and die in patches. It mainly harms the base of the stems. At first, brown spots appear at the stem base and gradually expand around the stem. In the later stage, the diseased part shrinks and the plants lodge.

[Control methods] Before the seedlings emerge, spray a 500-fold dilution of 20% tebuconazole wettable powder for prevention. At the initial stage of the disease, spray Bordeaux mixture at 1:1:100 or a 800-fold dilution of 50% thiophanate-methyl wettable powder, once every 10 d, continuously for 3 to 4 times.

Ring rot and spot blight

[Damage characteristics] They harm the leaves.

[Control methods] At the initial stage of the disease, spray Bordeaux mixture at 1:1:100 or a 1000-fold dilution of 50% carbendazim wettable powder, continuously for 2 to 3 times.

Platycodon grandiflorus false wireworm

[Damage characteristics] It harms the roots of Platycodon grandiflorus. The larvae damage newly sown seeds and crop seedlings about to emerge, and can also bite through the root crown of seedlings, causing missing plants and broken rows.

[Control methods] During the adult mating period from March to April and the larval period from May to June, spray to kill with a 800-fold dilution of 90% trichlorfon or a 1000-fold dilution of 50% phoxim emulsifiable concentrate.