Sunflower rust is a common disease, what are the conditions for sunflower rust to occur?

Sunflower rust is a common disease, after the occurrence of sunflower rust, there will be two main symptoms, one is red rust, red rust will harm the sunflower organ part, the plants growing in the ground, especially the leaf shedding is the most serious, sunflower Przewala is not a bacteria, it is a fungus, but also the pathogen of sunflower rust, after inducing rust, sunflower seed size, weight and oil content will be reduced, and the proportion of hulling will increase, and even cause particles to be harvested in serious cases, is one of the main diseases of sunflower, need to be prevented and treated in time.

Yellow dots appear on the front of the leaf (with brown dots on it, i.e., valves), then lesions and cup-shaped rust subholes appear on the back, and in late spring and early summer, brown bracts appear on the back of the leaf, which are round or nearly round in shape. The occurrence of the disease is closely related to the amount of bacteria and annual rainfall, especially after the emergence of seedlings and rust spores, which plays an important role in the epidemic. After entering the summer spore stage, the rainy season arrives early, and repeated infections can occur, often leading to outbreaks.

Rainfall is closely related to the disease flow of the year. Rainfall plays an important role in the occurrence of sunflower seedlings and rust spores in cold regions.

During this period, there is a lot of rainfall and a high number of cumulative infections. In the spore stage of summer, when the rainy season arrives and the temperature and humidity meet the needs of bacterial growth and development, a large number of repeated infections can cause epidemics of the disease. The occurrence of sunflower rust is closely related to the number of fungi accumulated in the previous year and the annual rainfall, especially after the emergence of seedlings and the appearance of rust spores, rainfall plays an important role in its epidemic.

The above is a detailed interpretation of the problem, I hope it will help you, if you have any questions, you can leave me a message in the comment area, you can comment with me, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, your like is the biggest help to me, thank you.

It may be that the indoor temperature is relatively high, it may be affected by epidemic diseases, it may be that the humidity is relatively high during the planting process, it may be caused by environmental factors, it may be caused by improper management, it may be that the bacteria have spread wantonly, and it may be that the rainfall is relatively heavy. It may be caused by a relatively single variety.

It may be that the rainfall is relatively large, it may be that there is more watering, so there is a situation of irrigating the roots, it may be that the temperature is relatively high, more than 23 degrees, it may be caused by improper management, it may be that it is not watered at ordinary times, and there may be pests and diseases.

The conditions that occur are that the environment is very humid, the light is insufficient, the nutrients are insufficient, and the planting steps are wrong.

Sunflowers should be a very common plant, and besides, this plant is very simple to grow, you only need to sow melon seeds, then you don't need to bother with it at all, they will thrive.

However, after the sunflower grows, it is very susceptible to infection, a kind of rust, this disease will cause the leaf petiole of the sunflower, etc., there will be a lot of spore piles on it, and these things are also very difficult to remove.

The germ usually begins to germinate in the spring, and if there is more and more rainfall, the disease will be more severe, and they will multiply very widely.

Generally speaking, after the sunflower blooms, if the temperature is in the range of 20 22, then this disease will form and spread in large quantities, which will lead to the rapid death of the sunflower, and generally in the summer sunny and rainy weather, such as today's scorching sun, tomorrow will be cloudy and rainy, this kind of weather will especially cause sunflower rust.

If we find that there are some round yellow spots on the leaves of sunflowers, then we must deal with them as soon as possible, remove these diseased leaves, and deal with them in time, they spread in large quantities, then it will seriously affect the yield.

Therefore, we must carry out prevention and control in advance, first of all, when we choose sunflower seeds, we should choose varieties with strong disease resistance, and after we can pick sunflowers, some of the residues that fall in the field are actually a kind of roots, so we must burn all the roots of these diseased plants in time after picking.

When carrying out prevention and control, we must choose the time of departure, at this time, when the sunflower is still relatively short, we can carry out manual spray control.

Introduction: Every plant has a risk of contracting diseases, just like people, you will get diseases, you will get sick. So the most common disease in plants, in fact, is rust, most plants have this disease, for some people outside the house or indoor sunflowers, their sunflowers produce black dots, and even emit black powdery items, then they are infected with sunflower rust, so what are the conditions for sunflower rust to occur?

1. What is sunflower rust? If you want to know the conditions under which sunflower rust occurs, you must first know what exactly is sunflower rust? Sunflower rust refers to the erosion and parasitism of fungi when sunflowers are growing, mainly distributed on the surface of sunflowers, which can easily lead to the drying of sunflower leaves, nutrient loss and death.

The cause of sunflower rust infection is from a fungus, this fungus parasitizes on the surface of the sunflower, and the surface of the sunflower continues to grow black pigment and black dots, and eventually these black dots rupture the lungs, which is sunflower rust.

2. What are the conditions for the onset of sunflowers? Understanding sunflower rust is actually that sunflowers are infected with bacteria, so what are the conditions for it to occur? The conditions for the occurrence of sunflower rust are mainly due to the continuous spread of fungi in summer through summer winds and summer rainstorms, so that sunflowers come into contact with pathogenic bacteria, which is the source of the disease.

This is called has a very big relationship with temperature and humidity, at this time the fungus spreads in the summer, its temperature is very suitable, the growth of this kind of fungus, so there is no problem in temperature, then the other is the problem of humidity, the local summer is very redundant, so the summer grows fast, and the rust on the sunflower also grows very fast.

3. The best plan for sunflower rust Since we know the principle of sunflower rust, what disease happened to sunflower. So we also need to know how to prevent sunflower rust? The technology of sunflower rust prevention and control is related to his local scientific and technological conditions, first of all, choose sunflower varieties that can resist sunflower rust from the root, so that sunflowers can be less eroded, and secondly, disinfection and disinfection are carried out, so that sunflower rust has nowhere to grow and cannot survive.

It is mainly caused by bacterial infection, because the temperature is relatively high, so it leads to bacterial infection, which is transmitted by spores.

The temperature was too high, the moisture was too large, and the light time was not enough, plus there were too many bacteria in the soil, and the stagnant water was not cleaned up in time, and there was no ventilation.

Infected with fungus, rainfall too much, or the rainy season comes too early, there is not enough light, and the ventilation performance is not good.

Sunflowers have good edible value, medicinal value and greening value. Rust is a common disease of sunflowers, which has a great impact on the growth of sunflowers. Below, Bian Xiao will introduce how to prevent sunflower rust.

The leaves, petioles, stems and other parts of sunflowers are susceptible to this disease. Infected leaves produce nearly rounded brown sac-like protrusions, usually formed in the lower epidermis of the leaf patches, which shrunk and scattered in brown summer spores. In the later stage, the site of onset produces black powdery winter spore piles.

When the disease is severe, the leaves are covered with rust spots, which shrank and turn yellow. Choose varieties that are highly resistant to disease. When disease occurs, remove the diseased leaves in time.

After autumn, focus on destroying diseased leaves and other diseases and disabilities to reduce the source of infection in the coming year.

If you want to learn more about pest control, remember the pest control knowledge base. Strengthen cultivation management, timely cultivation, and rational application of phosphate fertilizer and zinc fertilizer. After harvesting, the field is completely cleared of disease and residue, and the diseased leaves left on the ground are turned into soil, reducing a large number of overwintering bacterial sources and reducing the incidence rate in the second year.

Sow with 2% Li Xiuning WP, or sow with 25% Su Xiuning WP. Spray the drug at the beginning of the disease, once every 10 days, spray 2-3 times in a row. 20% Valliuling EC 400 -600 times, 80% Zinc Dyssen WP 600 -800 times, according to the addition of liquid neutral laundry detergent can improve the efficacy.

When sunflower rust occurs, there are two main symptoms, one is red rust, red sleeve disease can damage all the organs of sunflower plants growing on the ground, especially the leaves suffer the most damage. In general, red embroidery occurs during the dense growth period of sunflower leaves, and in general, symptoms begin to appear in the later stages of sunflower flowering. When red rust occurs, local yellow-brown spots first appear on the front and back of sunflower leaves, and then yellow particles appear on the back of diseased leaves.

A large number of circular spore piles appear in front and behind the leaves. When the spore pile bursts, there will be a large amount of powder scattered in it, which is called a germ spores.

As far as sunflower rust is concerned, the high temperature and high humidity environment is an excellent basic condition for survival and propagation. Sunflower rust is more common in the high temperature and high humidity season, and the harsh climatic conditions are the basis for the occurrence of sunflower rust. In general, the peak period of sunflower rust occurs from mid-July to late August, because the precipitation from late July to August can lead to the occurrence of sunflower rust.

Improper field management can also lead to sunflower rust. Generally speaking, if the scale of field planting is not reasonable, or the whole field lacks scientific planning, continuous cropping is easy to occur, which may lead to sunflower rust.

At the same time, it should be watered and fertilized at the same time, and it should also be prevented from insect pests, and it should also be sprayed with pesticides in a timely manner, and it should also be prescribed to do a good job of loosening the soil.

It is to choose a better variety of sunflower in advance, and when planting Zheng You, we must ensure that the environment is suitable, if Yu Huaidan finds that there is rust, it is necessary to spray the drug in time.

Of course, it can be prevented and controlled with drugs, which can well prevent and control sunflower rust.

It can be used to remove the disease residues in the field, and when it is found that there are some bad ones, apply phosphorus and potassium fertilizers, carry out late sowing appropriately, and also implement crop rotation in raw ways.

When there are pests and diseases, some drugs can be used to control them, and they can be prevented in advance, and when sunflowers are planted, the soil can be disinfected and the plants can be disinfected.

Flower thrips, Verticillium wilt, downy mildew, rust, black spot, must be ventilated in time, but also to control the moisture of the soil, do not water too much, to increase the drainage of the soil, but also to use compound fertilizer reasonably.

The main insect pests of sunflowers are: needleworm, grub, ground tiger, grass borer, beetle, sunflower borer, aphid, cotton bollworm, etc. The main diseases of sunflower are: rust, sclerotinia sclerotinia disease, liedang, downy mildew, brown spot, and verticillium wilt.

It can be prevented by the following methods:1Breeding and popularizing the planting of disease-resistant varieties according to local conditions.

2.Crop rotation and stubble. It is recommended to practice crop rotation with non-host plants for more than 3 years to reduce the source of infection.

3.Strengthen field management. Scientific fertilization, reasonable application of nitrogen, phosphorus and potassium fertilizers to improve plant disease resistance; Reasonable irrigation, pay attention to drainage after rain; After harvesting, remove the sick and residual bodies in time and take them out of the field for centralized treatment.

4.Pharmaceutical prevention and control. Symptomatic medication should be used in a timely manner at the beginning of the disease**.

The main diseases of sunflowers are: rust, sclerotinia and sclerotinia disease. Rust can be harmful from seedlings to maturity, and the control methods are generally to choose disease-resistant varieties, crop rotation, increase potassium fertilizer or use 25 times of 2000 times of rust for stem and leaf treatment.

Sclerotinia sclerotinia is commonly known as rotten head, which harms stems and flower discs, and can be treated with "R. redopharia" seed dressing or stems and leaves. Liedang is a flowering parasitic plant, parasitic in the roots of sunflowers to absorb sap, drought and heat are the most harmful, the best way to eliminate Liedang is to shovel and hoe in the field.

The main disease of sunflower viral disease is sunflower mosaic virus disease, which has a great impact on the growth and development of sunflower, and is easy to cause large-scale infection, which directly affects the yield of sunflower. The initial stage of sunflower mosaic virus disease is the systematic mosaic leaf with faded green ring spots, brown necrotic spots on the petiole and above the stem. In severe cases, the top of the plant will die, the top leaflets will be distorted, the flower disc will be deformed, and the seeds will shrink.

When planting, the soil must be very fertile, water it, fertilizer must be sufficient, the temperature must be suitable, there must be a certain amount of sunshine, it must be sprayed with some pesticides, spray some nutrient solution, and do a good job in the management of moisture-proof insects and sweat damage, you can reduce losses.