Control of Root Rot of growing Peanut

In recent days, many farmers have taken the leaves of peanuts to the market to ask what is going on. On the surface, the leaves turn yellow. Some farmers think it is lack of nutrition, but in fact, it is mainly the cause of root rot. Some time ago, Rain Water was frequent, resulting in moist soil, poor soil permeability and rotting roots, resulting in roots not absorbing nutrients and yellowing leaves. If not treated in time, the yield will be greatly affected. The symptoms, causes and control methods of peanut root rot are summarized as follows:

First, symptomatic root rot is commonly known as "rat tail" and rotten root. The disease can occur in all growth stages. Infect the newly germinated seeds, causing rotten seeds: the seedlings are damaged, the main roots turn brown, and the plants wither. When the adult plant was injured, the sunken strip brown disease spot appeared on the main root stem, the root tip was wet rot, the cortex became brown and rotten, easy to fall off, no lateral root or very few, similar to the rat tail. The rhizome has adventitious roots when it is wet. The aboveground parts of the diseased plants are short, the growth is poor, the leaves turn yellow, the flowering and fruiting are few and most of them are blighted fruit.

2. The pathogen overwintered on soil, disease remains and seeds and became the source of infection at the beginning of the second year. The pathogen is mainly transmitted by Rain Water and farming operations, and invades directly from the wound or epidermis, and the diseased plant produces conidia for re-infection. The disease was severe in seedling stage with heavy rain and humidity. Continuous cropping fields, shallow soil and sandy land are easy to occur.

III. Prevention and control methods

1. Carry out crop rotation. Crop rotation in mildly diseased fields for 3 to 5 years.

two。 Deep ploughing to improve soil, increase the application of organic fertilizer, reasonable drainage and irrigation to enhance disease resistance.

3. The seeds were mixed with 50% carbendazim wettable powder before sowing. It can effectively reduce the incidence of disease.

4. Chemical control: 1000 times liquid of Enzema combined with foliar fertilizer or 1000 times liquid of allicin with foliar fertilizer can be used to control the spread of the disease.