It is very important to prevent wheat diseases and insect pests. How to prevent wheat stripe rust?

? It is very important to prevent wheat diseases and insect pests. How to prevent wheat stripe rust?

In the early stage of stripe rust, chlorotic macula was formed in the lower leaves and leaf sheaths, and soon bright yellow or reddish brown powder blisters were produced, which looked like rust, that is, summer spore piles. There are several rows of diseased spots on a leaf. If the climate is suitable, it can spread rapidly to the whole plant, the whole cluster or even the whole field within 3~7 days, and the incidence rate is above 80%. If infected wheat plants are touched by people or objects, powdery spores will break, and a large number of bright yellow summer spores will be scattered or adhered to people or objects.

a

Wheat stripe rust is a typical long-distance airborne disease, which mainly completes the annual infection cycle with summer spores on wheat. The infection cycle can be divided into four links: overwintering, infecting autumn seedlings, overwintering and spring epidemic. The summer spores produced in the over-summer area are blown to the wheat area by the wind and become the initial impregnation source of autumn seedlings. Pathogens can overwinter with sick wheat seedlings. Summer spores are produced on winter diseased wheat seedlings in spring, which can spread and cause reinfection.

After wheat infection, chlorophyll is destroyed, photosynthetic area is reduced, leaf epidermis is broken, water transpiration is increased and respiration is strengthened, which hinders the growth and development of wheat plants. Mild onset, wheat grain is not full, affecting yield and poor flour yield; If the disease is serious, wheat grains can't be grouted, resulting in a sharp drop in yield.

b

Rational fertilization, advocating the application of compost or decomposed organic fertilizer made by enzyme bacteria, controlling nitrogen fertilizer, increasing the application of phosphorus and potassium fertilizer, and making a reasonable combination of nitrogen, phosphorus and potassium to enhance the disease resistance of wheat. Reasonable irrigation, high soil moisture or pay attention to ditch drainage after rain, and appropriate irrigation when the disease is serious in the later stage to reduce yield loss.

After harvest, plough and clear stubble in time, eliminate autogenous wheat seedlings, reduce the source of overwintering pathogens and reduce the incidence of wheat.

c

To control stripe rust, 50 grams of 20% triadimefon or 40 grams of 12.5% diniconazole and 50 kilograms of water can be used per mu. Conventional spraying can be used to control stripe rust, with an interval of 7 days, and then spraying 1 time. Chemical irrigation can be used to control underground pests. 500 ml of 50% phoxim emulsifiable concentrate and 750 kg of water can be used per mu, and the water can be poured in the right direction.