What is the cause of wheat dead seedlings and yellow seedlings? What should I do?

In recent days, I have received a lot of questions about the dead seedlings and yellow seedlings after the emergence of wheat. The descriptions are various and the symptoms reflected in almost every place are not particularly similar, but without exception, it is long-term rain. What emerged after that was the problem caused by the climate. Below, I will give some explanations on some of the situations that I have heard and what I know, and I also ask you to read the advice.

Dead seedling

There are several diseases that can cause wheat dead seedlings: total erosion, root rot, sheath blight, scab and bacterial diseases.

First of all, consider this year's seed dressing more than in previous years, but the situation of dead seedlings is also more serious. Is it really the effect of seed dressing? Not always, seed dressing is not omnipotent, but the basic seedling root rot, sheath blight, and scab are basically prevented by more than 90%. It can be said that difenoconazole, tebuconazole, flavononitrile After several kinds of ingredients are mixed and then dead, the three diseases can be ruled out. It is better to consider the total eclipse and bacterial diseases separately. Of course, no seed dressing needs to be considered comprehensively.

Find the problem on the root, how to solve it?

First, the seed dressing: the use of triazole products alone is difficult to control. It is recommended to use silicomycin with chlorobromoisocyanuric acid or chrysanthemum spray to control, if it is used with pentachloronitrobenzene or enemy It is also possible to apply it like gramson, but it is recommended to use it with systemic triazoles or antibiotics.

Then there is the bacterial disease, which can not be controlled by seed dressing, and the symptoms are easily recognizable. When there are symptoms such as soft and odorous pus in the field, it is definitely a bacterial disease. It is possible to use a bacterial disease control agent. But it must be sprayed through, and it is best to spray into the roots.

No seed dressing? It is necessary to take all the circumstances into consideration. If you can identify the symptoms clearly, you can prescribe the right medicine. If you are unclear, recommend a simple general formula: benzoyl/propiconazole/fluorosilazole+chunrumycin/chlorobromo Cyanuric acid/agricultural streptomycin.

Huang Miao

This symptom has appeared more this year. There is only one reason for this. The lack of nutrition causes the yellow seedling to be affirmative, but why does it lead to undernutrition? There are more reasons for this!

First, the sowing is too deep, resulting in poor root development and insufficient breathing.

This situation is not difficult to solve. It is recommended to use a single dose of carbendazim combined with foliar fertilizer to restore normal growth in three to five days.

Second, after the glutinous corn, the wheat yellow seedlings, the former glutinous soybeans or other broad-leaved crops, the glutinous wheat is not yellow seedlings, which is caused by repeated conflicts between the two crops on nutrient absorption, usually not obvious, the environmental mutation Showing symptoms.

Third, sowing too early or too late, the high temperature in the early stage of growth is too fast, resulting in underdeveloped roots, weak seedlings, and late raining and cooling caused wheat to be slow and not strong.

In this case, if you say it, you have to rely on rooting and supplementing nutrition to solve it. It is also recommended to combine the fungicide + foliar fertilizer.

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(Source: Good Agricultural Resources)