Peanut stalk rot is a devastating disease, also known as peanut rickets and peanut wilt. The disease has been increasing year by year in recent years and should be given attention.
First, the symptoms of the disease from the emergence of peanuts to mature at any time can occur, mainly to damage the cotyledons of peanuts, roots and stems, roots and stem base of the victims the most. Mostly in the main stem of the first pair of lateral branches or root disease in the upper middle of the disease. In the early stage of peanuts' disease, the leaf color of the shoots became lighter, the leaves drooped, and the compound leaves closed. Afterwards, the petioles fell completely and the whole plant wilted. When the soil was wet, the epidermis of the diseased section appeared black soft rot, and the later stage of the disease had spots of small black particles, which caused the death of the collateral branches. When the soil was dry, the epidermis of the diseased part was amber-like and transparent, closely adhered to the stem, and the internal tissues became brown and dry, and the stem marrow shrank.
Second, the incidence of rules Peanut stem rot spread mainly through the soil and seed carrier infection, there are two peak incidence of the year, the first peak of the disease in late May to late June. The second peak of onset is from late July to mid-August. The year when the humidity is high in the field can lead to serious diseases.
Second, control methods
1. Choosing good weather before sowing will peanuts sun 1 to 2 days, in order to kill the bacteria on the shell, improve seed germination rate, is conducive to the cultivation of strong seedlings.
2. Seed dressing precaution before sowing. Can be used dry seed weight of 0.3% of 50% carbendazim WP plus 30 liters of liquid soaking 50 kg, soak for 24 hours, then sowing.
3. Peanut spraying control during growth. In the event of sporadic disease in the field of seedlings or middle and late stages of peanuts, timely control of foliar spraying shall be conducted. Use 40% carbendazim suspension agent 100 g/mu, add water 60 kg, or use 70% thiophanate-methyl WP 800 ~ 1000 times liquid, 50% benomyl wettable powder 1500 times spray control.