Occurrence and Control of Peanut Stalk Rot
Peanut stalk rot, commonly known as "dumping disease", "card neck disease", "dead scorpion", often causes the death of whole or side branches of peanuts, resulting in serious reduction in production. Symptoms of stalk rot in the seedling stage mainly manifested as black rot in the cotyledons. In the early stage of peanut sensation, the color of the shoots of the shoots became pale, and the leaves of a thousand leaves drooped, and the compound leaves closed. As the disease progressed, all the petioles fell and the whole plant wilted. The adult planting stage took place on the first pair of collaterals on the base of the plant. Many small black bulges emerged, causing the death of collateral branches. According to observations, the disease mainly occurs in May - early June. In late June, it was the peak period of the first onset, and the peak of the second onset was from early August to early September. Prevention and control methods are mainly based on comprehensive prevention and control: 1. Strengthen field management. In order to avoid the occurrence of strains, it is necessary to avoid the occurrence of plant wounds at the time of clearing and planting seedlings, and to apply grass ash to the growing period. 2, pharmaceutical control. Can be used 50% carbendazim WP according to the seed amount of 0.3 seed dressing, or with 25% carbendazim wettable powder by seed amount of 0.5% seed dressing, with 40% carbendazim suspension 1 kg, watered 1000 kilograms, 50-1000 kilograms of mu is sprayed. After the seedlings are sprayed once before flowering, the control effect can reach 48.8--99.4%. It can also treat root rot and other diseases. The same effect can also be obtained by spraying with 70% Thiophanate 800--1000 times.