Control methods of Peanut Stem Rot

Peanut stem rot, commonly known as rotten neck disease, is distributed in all peanut producing areas across the country. It generally occurs in the middle and later stages of the disease. Soon after it is infected, it withered and died. Pods often rot or seeds are dissatisfied, resulting in serious losses. The general field incidence rate is 2030%. In serious cases, it reaches 60% to 70%, especially peanut plots that have been cropped for many years and even die in patches. Let's take a look at the prevention and control methods of peanut stem rot.

Symptoms of peanut stem rot

The pathogen invades the plant from the cotyledons or young roots, producing yellowish-brown watery spots in the root neck, and then turning dark brown, causing the root tissue to rot. When in a humid environment, the diseased part produces conidia (that is, small black protuberances), the epidermis of the diseased part is easy to peel off and the fibrous tissue is exposed. When the environment is dry, the epidermis of the diseased part is sunken, close to the stem, and after the adult plant is infected, the whole plant dies in about 10-30 days, and the disease site is mostly close to the ground at the base of the stem, and sometimes the main stem and side branches die by stages.

Incidence conditions of peanut stem rot

The pathogen overwintered mainly on diseased and residual plants in seeds and soil and became the source of disease in the second year. If the diseased plant as a beverage or pod shell after raising livestock manure, as well as mixed with diseased plants accumulated soil manure can also spread. The transmission in the field mainly depends on Rain Water runoff, followed by strong wind, but germs can also be transmitted in the process of agricultural operation. In rainy and wet years, especially in the harvest season, the bacteria-carrying rate of harvested seeds is higher, so it is not only the main disseminator of the disease, but also can spread over a long distance through introduction.

Agricultural Control of Peanut Stem Rot

1. Select superior varieties: Yuhua 7, Yuhua 8, Yuhua 9, Luhua 11 and so on are better varieties.

2. Manage the seeds: peanuts used as seeds should be harvested in time, dried in time, stored in a ventilated and dry place, moistureproof and mildew-proof, and should be carefully selected and dried before sowing to facilitate germination and emergence.

Chemical Control of Peanut Stem Rot

1. Medicament soaking seeds: use 50% carbendazim wettable powder and new high fat film to press 5% of the seed quantity, add fine soil 1.5 × 2 kg to spray water, then mix well, accelerate germination and sow, which can ward off underground diseases and insects, isolate virus infection, do not affect germination and swelling function, strengthen respiratory intensity, and improve seed germination rate.

2. Medicament spray: use 50% carbendazim wettable powder 600x liquid or 70% carbendazim plus 50% carbendazim powder spray during the growing period, spray once after peanut seedlings and before and after flowering, or spray 1 or 2 times at the initial stage of the disease. Purek 800-1000 times liquid spray can also treat peanut root rot, root blight, leaf spot and so on.