How serious is the damage of wheat rust?Why are many farmers afraid of rust in wheat seedlings in th

After wheat is damaged, plant nutrients are continuously consumed by pathogenic bacteria, the summer spore pile on the surface of the plant destroys the host's epidermal cells and carotene, the total area of photosynthesis is reduced, the plant photosynthesis is weakened, and the water evaporation is accelerated, and the water surface evaporation is generally increased by 20% 60% compared with the healthy plant, and can be increased by 200% and 300% in more serious cases, resulting in great interference in plant growth and development. When the disease is light, the spike shape is short, the grain is small, the seedling emergence rate is reduced, the rice yield is reduced, and when the disease is severe, the plant is short and cannot produce the panicle normally.

Wheat stripe rust is mainly spread by air currents, and the winter climate in recent years is more conducive to the spread of the disease. In China, wheat cultivation occurs mostly in the area, some areas are more serious, and some areas are relatively light. The spread of wheat stripe rust is fast, once the disease occurs, it will lead to a yield limit of about 10%, and more than half of the severe plots may be extinct.

If wheat cannot carry out normal plant photosynthesis, its growth and development will inevitably suffer from different degrees of harm.

Wheat stripe rust is a typical remotely controlled airborne disease, this summer spores can be dispersed by the wind, and even sent to an altitude of 1599 m to 4300 m through strong air currents, and blown to areas hundreds of kilometers away without losing vitality for re-infection. Wheat stripe rust mainly harms winter wheat in spring and summer, and after the pathogen has harmed rice seedlings, it is cultivated in the open field in the high altitude areas of southwest and southwest China with the air flowAfter the winter wheat is planted in autumn, it rushes to many major wheat producing areas with air currents, attaches to the winter wheat seedlings for the winter, and damages the rice seedlings again the following year.

Wheat rust spreads quickly. There are three key factors in the occurrence of wheat rust, the source, the host and the climate, in which the climate is an important factor, because the rust cells will be scattered with the wind, rain, etc., the spread speed is fast, and it will be explosive in about a week. The prevention of wheat rust is achieved by the diversification of disease resistance genes, the diversification of disease resistance types and the improvement of disease resistance persistence in wheat populations.

In order to ensure the disease resistance of wheat varieties, in high-incidence land and plots with more serious diseases, try not to plant wheat again, and solve or reduce pathogenic bacteria according to the method of reducing the host in rotation.

Wheat rust includes stripe rust, leaf rust and stem rust, among which stripe rust and leaf rust are the most prevalent and the most harmful. Wheat rust mainly occurs on leaves, destroys chlorophyll, and reduces photosynthetic efficiency, resulting in obstruction of wheat grain filling. The output of light cases will be reduced by 10 to 20%, and the output will be reduced by more than 60% in major years, or even extinct.

It's very serious, it will lead to extinction, so many farmers are very afraid of very serious diseases.

This is contagious, and it can also lead to the death of a large area of plants, which will eventually affect the yield, which will make farmers very afraid.

When the virus (summer spores) falls on the wheat leaves, under the conditions of suitable temperature (stripe rust and water, the summer spores begin to produce hyphae, absorb leaf nutrients, germinate and reproduce, and finally form the summer spore pile, which is the yellow spot we see, thus harming the wheat seedlings. Wheat stripe rust is a typical long-range airborne disease, these summer spores can be carried by the wind, and can even be carried to an altitude of 1599 m to 4300 m by strong air currents, and blown hundreds of kilometers away without losing activity for reinfection.

The large area of planting susceptible varieties is the basic condition for the epidemic of stripe rust, but the epidemic of the disease is also determined by the source of bacteria and meteorological factors, especially rainfall and humidity, and the stripe rust fungus infects wheat under the conditions of temperature 14-15 and water droplets and water film.

The pathogen grows in the wheat leaf tissue, and when the effective accumulated temperature is 150-160, it produces summer spore piles on the leaf surface.

Under the premise of planting susceptible varieties in a large area, the amount of overwintering bacteria and spring rainfall have become the two important conditions for epidemic, the low temperature duration in early spring is longer, and the conditions of spring rain are severe, and the disease is heavy in autumn seedlings, and the source of bacteria is large in warm winter, and the early spring rain in the second year is more conducive to the epidemic of stripe rust.

When the temperature rises to 5, stripe rust spores begin to be produced, such as spring rain or condensation, the disease spreads rapidly, it is easy to cause spring epidemics, and if the rain is more frequent and the temperature is suitable in April-May, it will be conducive to the occurrence and spread of stripe rust.

If there is rain in early spring and drought in the later part or rain in the late drought of early spring, stripe rust occurs lightly or is not endemic locally. FYI.

Wheat rust mainly harms leaves, leaf sheaths, stems and ears, according to the different parts of the disease, its name is also different, such as leaf rust and stalk rust, etc., but the nature is the same. At the onset of the disease, yellow or brown spore piles appear in the affected area, and these spores are continuously transmitted through the air, the spread speed is fast, and the damage area is active and widespread, and the color of the spore pile gradually changes to black in the later stage. It has a great impact on wheat, affecting the growth and development of wheat, making the wheat grains lean, and affecting the yield and variety.

Control methods: planting disease-resistant varieties mainly; Eliminate weeds and self-growing wheat seedlings, and control the source of oversummer bacteria; Reasonable dense planting and appropriate timely topdressing, to avoid too much and too late application of nitrogen fertilizer; When rust occurs, ditches should be opened for drainage in rainy wheat areas in the south; Irrigation should be carried out in time in the arid wheat areas in the north to replenish a large amount of water transpired due to the destruction of the foliage by rust fungi and reduce yield loss.

It can be sprayed with high yield and yield**, can prevent diseases and insects, and can also promote seedlings and seedlings.

Summary. Hello dear <>

In winter, wheat seedlings rust Bing choose anti-Bing varieties Yao agent control Strengthen field management Eliminate self-growing wheat seedlings will definitely affect the yield. <>

How to treat winter wheat seedling rust affects yield.

Hello <> by hand

Potato is used for winter Zhaoheng wheat seedlings rust, Bing selection of Bing resistant varieties, Yao agent control, strengthen field management, eliminate self-grown wheat seedlings, will definitely affect the yield. <>

Extended data: Methods of controlAgricultural control: Creation of an environment that is not conducive to the activity of needleworm.

Before planting, it is necessary to plough and rake deeply, and turn it deep in time after harvesting; Ploughing in summer, especially after wheat harvest and when the bureau is well-known, can shasi some pests, use the adult phototaxis xing, and set up a sha-insect lamp in the field to lure the adult during the adult occurrence period. Chemical yao control: yao agent seed dressing, soil sprinkling and root irrigation can be used.

40% methyl isosulfonate oil and 48% dusi tick (Lesben) can be used for seed dressing; 5% phosphine granules per mu kilograms, mixed with 25 kg of fine soil, sprinkled with cultivated land or along the ridge before sowing; Before winter and wheat regreening stage, when it is found that needleworm is the infestation of the tung section to cause SI seedlings, it is necessary to irrigate the roots as soon as possible. You can use 100 150 ml of 40% phosphine to mix with 50 kg of water and 75 kg of land section to prepare yao liquid. <>