The prevention and control technology of peanut white silk disease is explained in detail!

Peanut white silk disease is one of the main diseases harmful to peanuts. Its symptoms are brown soft rot at the base of peanut roots, pods and stems, and white silk hyphae on aboveground rhizomes. Let's take a look at the prevention and control techniques of peanut white silk disease.

I. conditions for the incidence of white silk disease of peanut

The pathogen can survive the winter with sclerotia or hyphae in soil or on diseased remains for 5 ~ 6 years, and most of them are distributed in the topsoil of 1~2cm. The germination rate of sclerotia below 2.5cm decreases obviously, and the sclerotia almost does not germinate in the soil. The sclerotia germinates the next year and produces hyphae, which invades from the epidermis or wound at the base of the plant rhizome, and can also invade the ovary stalk or pod. Seeds can also carry bacteria. Germs spread in the fields by running water or insects, high temperature, high humidity, soil viscosity, poor drainage, low-lying land and rainy years are easy to occur, clear up immediately after rain, diseased plants wither and die quickly, and the disease is serious in continuous cropping land and sowing early.

II. Harmful symptoms of white silk disease of peanut

Under the condition of high humidity, the aboveground part of the infected plant can be covered by white mycelium, and then spread to the nearby soil surface and spread to other plants. in the extremely humid environment, the mycelium cluster is not obvious, while the base of the damaged stem is covered by long fusiform disease spots with light brown or even red cork. Under dry conditions, the disease marks on the stem occur below the ground surface, showing brown fusiform, about 0.5cm. And rape seed sclerotia, stems and leaves yellowed, gradually withered, peanut pods rot.

III. Prevention and control of white silk disease of peanut

1. Improve soil conditions

Remove the diseased remains and turn deeply after harvest, rotate with rice, wheat, corn and other gramineous crops for more than 3 years, and advocate the application of compost or mature organic fertilizer made by enzyme bacteria to improve soil permeability.

two。 Select seeds with strong disease resistance

Spring peanut is suitable for late sowing and squatting seedlings at seedling stage to improve disease resistance. At the same time, the disease-free seeds were selected, and the seeds were mixed with 50% carbendazim wettable powder of 0.5% seed weight. After the disease occurred, the medicine soil was made by mixing 50% seed powder 1kg with fine dry soil 15kg, and 75g of soil was used for each hole.

3. Drug prevention and treatment

The initial stage of the disease was sprayed with 600-800 times or 50% carbendazim wettable powder or 50% prohydantoin wettable powder or 50% carbendazim (Sukeling) wettable powder, 20% methyl ibuprofen EC 1000 × 1500 times, each plant sprayed 100 ml of good medicine solution.

The above is the introduction of the soil flow net to the prevention and control of peanut white silk disease. Peanut white silk disease begins to sprout under the condition of high temperature and high humidity, infecting peanut, sandy soil, continuous cropping, excessive planting density and serious disease in overcast and rainy days.