Does rain alleviate corn rust? What causes corn rust?

If it rains, it shouldn't be able to alleviate this disease, because the rain will not improve his condition, so the best thing is to spray him in time**.

Now, the national wheat harvest has begun, and the wheat harvest is followed by corn sowing, such as corn sowing, continuous heavy rain weather or flood irrigation, which will cause corn flour seeds, rotten seeds, and affect the emergence of corn seedlings.

In addition, the sudden rainfall after continuous drought, high humidity in the field, high rate of bacterial infection, and the rapid onset of maize bacterial stem rot took only 2 days from onset to collapse.

Let's take a look at the symptoms of corn flour seeds and rotten seeds.

Symptoms of corn rot.

Corn flour seeds, rotten seeds are generally our common uneven seedlings or lack of seedlings, in the position of the lack of seedlings, we pick up the soil, you can see that the corn seeds because of the absorption of excessive water, resulting in expansion, decay and deformation, some of the "C", "S", "J" word deformity, generally rotten into brown or black, after breaking the seeds of the rotten seeds, you can find a thick slurry liquid.

Why does heavy rain cause corn flour seeds and rotten seeds?

1. Rainfall leads to high soil moisture.

Excessive humidity is related to continuous heavy rain, when the humidity in the soil is too large, it will make the oxygen ** insufficient, and the seeds will not breathe oxygen, and the seeds will rot. In general, the situation is more serious where there is water accumulation in low-lying land, and the situation is relatively light in high-lying or flat plots.

2. The temperature is too low due to rainfall.

Continuous rainy weather, resulting in lower temperature than a few days ago, under normal circumstances, corn emergence, germination at 20 o'clock is more suitable, 25-35 o'clock germination is the fastest, more than 40 is not conducive to germination. If the temperature is suitable for sowing, and the temperature is too low after rainfall, it will lead to powdered seeds and rotten seeds.

3. Rainfall leads to soil compaction.

After rainfall, the soil is easy to compact, and in the case of compaction, the seeds are easy to have powdered seeds and rotten seeds.

4. Too much rain.

If the corn bottom fertilizer is not applied deeply, and the seed fertilizer isolation is not enough, the chemical fertilizer will melt, which will cause powdered seeds and rotten seeds. In addition, herbicides will also be leached by rainwater and infiltrate into the germinated seedlings, causing seedling rot.

There is no way to alleviate this situation, because the situation of plant fungi in the rain may be more serious, not only does not have a relieving effect, but will be more serious.

No, this is caused by a bacterial infection and it is better to spray pesticides.

Rainy days can alleviate some of this disease, but if it rains a lot, such as the rainy season, it is definitely not good, so it is best to take medicine in time.

Hello, friend rain to alleviate corn rust? This rain will not alleviate corn rust, and it may be aggravated if it rains, I hope it can help you.

Rain does not alleviate corn rust.

Corn rust. Pesticides need to be sprayed to be effective**.

There is no way to alleviate the situation, so the main reason is that this rainy day is more conducive to the growth of some plant fungi, so the situation may become serious.

Corn rust spreads and spreads in the south by summer spores, and there is no overwintering problem. In the north, the source of the disease is more complex, and the source of the fungus comes from the diseased residue or from the south and the transposing host of Sorrel sorrel, which becomes the initial source of infection of the disease. After the leaf infection in the field, the summer spores produced by the diseased part are transmitted by the air current, and the reinfection is carried out and spreads.

Early maturing varieties are susceptible to disease in production. High temperature and humidity or even rainy and partial nitrogen fertilizer are serious.

Rain can't alleviate the rust of English, so you should use some foliar fertilizer and medicine.

It can't be alleviated, because the corn has rust, and it must be treated with medicine. Washing with rain will not cure it.

Hello this friend, it's raining, and it can alleviate the drought of the crops, but what. Rust related to corn cannot be solved.

Does rain alleviate corn rust? It should be said that it is a little better, after all, if he rinses, his condition will still be a little less, but it still has to be medicated.

When it rains, it has a certain effect, and the most important thing is to spray some potions, so that this corn rust can be alleviated.

I don't think rain can alleviate corn rust. Still have to take medication.

If it rains, it will not be able to alleviate corn rust.

Corn rust mainly damages leaves, but also leaf sheaths, stems and bracts.

Maize rust is an important disease in South and Southwest China. It mainly infects leaves, and can also infect fruit spikes, bracts and even male flowers when severe. The pathogen is called corn stalk rust, which belongs to the subphylum Basidiomycetes fungus.

The summer spore pile is yellowish-brown. Summer spores are light brown, oval to subglobular, with fine spines.

Symptoms: Corn rust is an important disease in South and Southwest China. It mainly infects leaves, and can also infect fruit spikes, bracts and even male flowers when severe.

At the initial stage, small pus scars of light yellow elongated to ovate brown are scattered on both sides of the leaves, and the posterior vesicles are ruptured, and rust-colored powdery matter is emitted, that is, the spores of the pathogen summer; In the later stage, black near-circular or oblong protrusions are born on the lesions, and after dehiscence, black-brown winter spores are exposed.

Maize rust in the Huang-Huai-Hai area is southern rust, which is an airborne disease, and the rust spores are brought by typhoon transmission. According to the research, the bacterial sources in the rust occurrence area mainly come from the Philippines and Taiwan.

After the first disease occurred in the southern maize area near the source of bacteria, the source spread to a wide area with the typhoon from the north. It usually occurs in August when the weather turns cooler, with an average temperature of 26 28 and high humidity. The rust spores brought by the passage of the typhoon and the favorable climatic conditions are caused by the occurrence of rust.

Corn stalk rust fungus prefers warm and humid environment, and the onset temperature range is 15-35; The optimal ambient temperature is 20-30, and the relative humidity is more than 95%; The most suitable growth period for susceptible diseases is from flowering and heading to the middle and late harvest periods. Summer spores need high humidity and foliar condensation during invasion, which is suitable for summer spore formation and invasion.

The main incidence of maize rust in Shanghai and the middle and lower reaches of the Yangtze River in China was from May to October, when the incidence was severe in the summer and autumn with high temperature, humidity and continuous rain. The disease was more severe in the fields with poor drainage in the continuous cropping between fields. In cultivation, the disease was severe in the fields planted with early-maturing varieties, high density, poor ventilation and light transmission, and partial application of nitrogen fertilizer.

There are many reasons for rust, divided into internal and external causes, the internal cause is the variety problem, some varieties of disease resistance is weak, easy to be infected with diseases, for such varieties, should give up, do not choose; In terms of external factors, there are more, common high temperature and humid weather, such as corn in the middle and late stages of growth, even rainy weather is more, the probability of corn rust is very large (similar to iron rust, after encountering water, it is easy to rust, although the principle is not the same, but the meaning is this, everyone can understand it), and then when the light is insufficient, the probability of rust will also increase.

Looking forward to your good reviews.

Corn rust is because corn has a disease in the growth process, you do not apply enough fertilizer to the corn, so it has no resistance to the disease, when choosing fertilizer, try to choose imported water-soluble fertilizer, fast dissolution, high absorption and utilization rate, so that corn can absorb more nutrients, improve disease resistance.

During this period, the rhizomes and leaves of the plant are in a period of vigorous growth, and the development of the reproductive organs of the rhizomes and leaves requires a lot of nutrients. At this time, it is necessary to fertilize skillfully, and to master the amount of fertilizer and fertilization time, so as to avoid the collapse of corn and potatoes, which can play a role in strengthening stalks and promoting ears, and reduce the occurrence of corn empty stalks, baldness and lodging.

When the corn grows to 6-7 leaves, it is necessary to fertilize, and organic fertilizer can be applied per mu or strip with Yanwo high nitrogen water-soluble fertilizer. It should be noted that the amount of fertilizer can not be increased at will, which is easy to cause excessive vegetative growth, thereby affecting the reproductive growth of corn. In the booting period of corn, that is, after the "big flare" of corn appears, the female cavity of corn begins to differentiate with spikelets and florets, and timely re-application of bract fertilizer can promote the normal development of ears and increase grains, and generally apply bract fertilizer in a timely manner 14 days before heading.

Proper fertilization at the flowering stage can prolong the grain filling period of corn, promote grain filling, improve seed setting rate, and increase yield. If in the early management, the fertilization is insufficient and the soil is deficient in nutrients, it is best to apply an appropriate amount of tapping fertilizer. It can be used per mu with water-soluble fertilizer and high phosphorus fertilizer, mixed with an appropriate amount of fine soil, and applied near the roots of the plant, but do not directly contact with the root system.

If the soil moisture is insufficient, it can be used to irrigate the roots of the plants with fertilizer and water.

Rain does not alleviate corn rustOn the contrary, under the conditions of relatively low temperature, frequent rainfall and high relative humidity, corn rust is prone to occurrence and epidemic.

How to control corn rust?

1. Select the variety

There are many varieties of corn, between different varieties, there are differences in resistance, such as some early-maturing varieties are prone to rust, especially a certain variety, when planted locally, perennial diseases are more serious, and more varieties should be replaced in time to plant, mainly with strong disease resistance.

2. Reasonable dense planting

When the planting density is too large, the field ventilation is poor, corn rust is easy to occur, in the actual planting process, if the amount of silver shouting is too large, not only is not conducive to increasing yield, but also will lead to yield reduction, so reasonable dense planting has a good effect on the prevention of corn rust.

3. Fertilization

In the process of corn growth, there are generally three points of top dressing, namely bottom fertilizer, top dressing, foliar fertilizer, reasonable supplementary fertilizer, which is conducive to the normal growth of corn, increases its own resistance, and reduces the harm of diseases, do not only pay attention to the use of nitrogen fertilizer, but ignore the addition of phosphate fertilizer, potassium fertilizer, and other trace elements.

If the nitrogen fertilizer is applied too much plot, the corn is very permeable and easy to grow, and the probability of being infected with rust increases, it is recommended that the base fertilizer is mainly ternary compound fertilizer, and the Haihewei balanced water-soluble fertilizer can be applied, and urea can be applied at the large bell mouth stage, and foliar fertilizer can be sprayed many times according to the growth of corn in the middle and late stages.

4. Water management

The conditions of high temperature and high humidity are conducive to the occurrence of rust, and the temperature is high in July and August, and there is a lot of rainfall, therefore, it is very important to reduce the humidity in the field, pay attention to the drainage work after the rain, for the relatively low-lying plots, it is easy to form water, and the drainage ditch should be dug in advance before the rain.

5. Spraying agents

It is determined based on local resistance, medication techniques and the cost of cultivation. In addition, for the plots where rust occurs severely, the control effect of spraying once cannot be completely cured, and it needs to be sprayed about 3 times at an interval of 7-10 days.

I'm afraid not. Maize rust is an important disease in South and Southwest China. Old potatoes mainly infect leaf servants, and in severe cases, they can also infect round spring ears, bracts and even male flowers.

In the past, the family used to grow corn. So I know that rain won't alleviate corn rust. Pesticides are still needed.

After corn rust, the infected plants need to be removed and destroyed first, and then the soil is rooted, and an appropriate amount of quicklime disinfection is applied, and corn rust can be used in the early stage of corn rust with 20% difenoconazole microemulsion 1500 2000 times, 30% flusilazole microemulsion 300 5000 times, 80% mancozeb wettable powder 600 800 times liquid**.

Corn is native to Central and South America. It is now cultivated all over the world. It is mainly distributed between 30° and 50° latitudes.

The largest cultivated areas are in the United States, China, Brazil, Mexico, South Africa, India and Romania. The main corn producing areas in China are the mountainous areas of Northeast China, North China and Southwest China.