What is dwarf yellow disease in wheat, and what is the disease of yellowing in a large area of wheat

Wheat yellow dwarf virus disease is caused by barley yellow dwarf virus, which can infect wheat, barley, oats, rye, corn, finch wheat, tiger tail grass, small teff, golden dogtail and so on.

It mainly shows yellowing of leaves and dwarfing of plants. The typical symptoms of the leaf are that the new leaf gradually expands from the leaf tip to the leaf base and turns yellow, the yellowing part accounts for 1 3 1 2 of the whole leaf, the leaf base is still green, and it remains for a long time, sometimes there are yellow-green alternating stripes parallel to the leaf veins but not limited by the leaf veins. Diseased leaves are smoother.

The dwarfing of plants at the early onset is severe, but it varies from variety to variety. The onset of winter wheat is not obvious, it is not tolerant to low temperature and easy to freeze to death during the overwintering period, the tillers of the next spring equinox that can survive are reduced, the diseased plants are seriously dwarfed, and there is no heading or very small heading. The plants susceptible to the disease at the jointing and booting stage were slightly shorter and had poor root development.

At the heading stage, only the flag leaves were yellow, the dwarfing of the plant was not obvious, and the heading and grain weight were reduced. The difference with physiological yellowing is that the physiological disease occurs from the lower leaves, and the whole leaf disease is more uniform. The lower leaves of yellow dwarf disease are green, the new leaves are yellowed, and the flag leaves are more severe, starting from the tip of the leaves, the central disease plant appears first, and then expands to the periphery. [

The yellowing of wheat flakes may be caused by yellow leaf disease, and sterenol 750 times + imidacloprid + brassinolide can be sprayed for control, once every 3 days, sprayed 2-3 times.

The yellowing of wheat seedlings in such a large area is extremely rare even in the past 20 years. Some people think that the problem is caused by wheat seeds, some people think that they have purchased fake fertilizers, and more people suspect that herbicides are causing the problem. Agricultural material dealers blame this on straw returning and severe cold and frost damage.

Wangchang wheat entered the jointing stage in advance before the winter dormancy, and after suffering frost damage, it could only rely on inverted tillering to re-form tillering seedlings, which laid a great hidden danger for the wheat yield in the coming year. Therefore, farmers can refer to the practice of previous years when planting wheat, but also refer to the climate conditions of the year, as well as the fertilizer and water conditions in the field, to determine the amount and time of wheat sowing, rather than following the trend and rushing to plant.

Summary. Kiss! Hello. Wheat leaves are yellow, dry leaves. There are a number of reasons for this.

First, drought and little rain.

Second, the roots of the straw returning to the field are suspended.

Third, the chemical fertilizer is burned, and the separation of seed fertilizer is not good when sowing.

Fourth, diseases, root rot, total erosion, etc.

Fifth, insect pests, mainly underground pests such as needleworms.

Sixth, pesticide damage, to prevent the improper application of pests and diseases.

Seventh, lack of nutrients, lack of trace elements, uneven fertilization of nitrogen, phosphorus and potassium, straw returning to the field needs to increase nitrogen fertilizer application.

Eighth, the herbicide damage of the previous stubble.

It is recommended to carry out prevention and control according to the actual situation.

How to rot and dwarf the roots of wheat are yellow.

Kiss! Hello, this question is being answered for you, you need to wait patiently for about five minutes, the answer will be revealed for you immediately, don't worry!

Kiss! Hello. Wheat leaves are yellow, dry leaves.

There are a number of reasons for this. First, drought and little rain. Second, the roots of the straw returning to the field are hanging into the sky.

Third, the chemical fertilizer is burned, and the separation of seed fertilizer is not good when sowing. Fourth, diseases, root rot, total erosion, etc. Fifth, insect pests, mainly underground pests such as needleworms.

Sixth, pesticide damage, to prevent pests and diseases from being caused by pesticide application and not rotting next to Li Dang. Seventh, hunger and retardation are deficient, lack of trace elements, uneven fertilization of nitrogen, phosphorus and potassium, and nitrogen fertilizer application needs to be increased when straw is returned to the field. Eighth, the herbicide damage of the previous stubble.

It is recommended to carry out prevention and control according to the actual situation.

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1. The quality of cultivated land is poor and the bottom fertilizer is insufficient. In order to prevent the normal growth of winter wheat from being affected due to the return of corn straw to the field, when using urea as the base fertilizer, choose slow-controlled urea as much as possible, or choose nitrogen, phosphorus and potassium controlled-release fertilizer with nitrogen control of about 15%.

2. Pest damage. Wheat seeds must be dressed with insecticides, for example, thiamethoxam coating agent, phosphine and so on. After the bud worms are found on the plant, the drug should be sprayed immediately, and 1000 times the liquid pymetrozine, thiamethoxam, acetamiprid, etc.

The problem of seeds is also related to the weather, which may be caused by germs or drought.

The problem of seeds is related to the planting environment and the weather, and there are many reasons for this.

There could be a variety of reasons why wheat dwarfs and does not yellow its leaves, and here are some of the possible reasons:1Wheat varieties:

Some wheat varieties are inherently short, such as dwarf wheat, which is more dwarf than common wheat due to their long-bending cherry blossom habits. 2.Moisture**:

Wheat needs adequate water during growth**. If the soil is dry, bent or lacking water during the growing season, wheat may become dwarf and have no yellow leaves. 3.

Nitrogen deficiency: Nitrogen is one of the important nutrients needed for the growth of wheat and is essential for the growth and development of wheat. If the nitrogen content in the soil is insufficient, wheat may become dwarf and have no yellow leaves.

4.Pests and diseases: Wheat is susceptible to various pests and diseases during its growth, such as powdery mildew, scab, aphids, etc.

If wheat is attacked by pests and diseases, it may behave as dwarf and not yellow leaves. 5.Climate & Environment:

Environmental factors such as temperature, humidity and light required for wheat growth have important effects on its growth and development. If the climate is not suitable, it may lead to dwarf wheat and not yellow leaves.

You have already found the results for the shack; The dwarfing and non-yellowing of wheat leaves are mainly due to the vigorous growth and strong ability to absorb nutrients in wheat, which are related to the introduction of semi-dwarf genes. The reasons for the banquet are as follows:1

The role of semi-dwarf genes: After the introduction of semi-dwarf genes, it can inhibit the stem elongation of wheat, and reduce the spacing between each node of the wheat plant and the liter, resulting in a low plant height of wheat. 2.

Nutrient uptake capacity was enhanced: The root distribution range of dwarf wheat plants was narrow, but the root uptake capacity was stronger. As a result, they can absorb nutrients more efficiently, thus guaranteeing the nutrients** and health of the leaves.

3.Fine fertilization: The fine fertilization method can effectively ensure the growth and development of wheat and enhance the absorption and utilization efficiency of nutrients, so that wheat plants can remain dwarf and have less or no yellow leaves.

It should be noted that in the planting process of dwarf wheat, it is also necessary to reasonably control the amount of fertilizer and dosage to prevent wheat from nutritional imbalance and lead to the occurrence of diseases such as yellow leaves. Hope mine is helpful to you.