What are the symptoms of toon blight? How to prevent it with pesticides?

<> rice blight is divided into two types: physiological blight and pathological blight. The main cause of physiological blight is that the seedlings are unsuitable for soil pH, water, fertilizer, gas and heat conditions, and the symptoms of the disease appear, which are manifested as dwarfing, yellowing, few or no new roots, and the occurrence of light toon tree. The toon tree is said to be an angry tree, and if the person breaks the buds frequently, the toon tree will get angry and die.

<> is actually due to gluttony, which means that it needs a lot of nutrients every year to grow strong. The old farmer said that the dead animal carcasses should be buried in the roots in order to meet the nutritional needs of the toon tree, and the nutrient soil formed after mixing the seedling agent and the sieved fine soil. The seedling enhancer contains nutrients, fungicides, acid-regulating agents, insecticides and other components, and the main function of the acid-regulating agent is to ensure that the pH value of the nutrient soil can be presented in the pH range for a period of time.

The symptoms are poor growth of seedlings, brown lesions in the leaf sheaths, and gradual decay, and the roots appear brown and diseased, and the roots can be seen to be aging, yellow, russet, and seriously black and rotten.

The internal cause of red wilight is mainly potassium deficiency in rice plants, spraying 30 40 grams per seedling field with 10 kg of water for 30 40 grams per seedling field, increasing the dosage when seriously ill, and focusing on the use of drugs in the disease center. If the seedling field is dry, irrigation should be sufficient before using medicine, which can improve the control effect. The addition of Baohefeng, Onlibang, alginic acid foliar fertilizer or rooting agent spraying can promote the seedlings to be sprayed with potassium fertilizer, and it can also occur when it is light, the seedbed seedlings turn yellow, the disease center becomes a pot bottom yellowing, and the seedlings die in pieces when it is heavy; Pathological blight is a kind of disease caused by pathogenic fungal infection in the soil, which is manifested as rot, dwarfing and yellowing at the base of the seedling plant, and the root is easy to break when the plant is pulled by hand.

color, the leaves are curled, yellowed and withered, and finally brown wilts and dies. From the section of the bed and soil infected with the pathogen, the growth of some white or light red seedling roots can be clearly seen.

After the toon was unearthed, it was relatively young and tender, the stem was not lignified, and the germs spread in the neck, destroying the neck tissue, and the toon lodging. It can be mixed with the medicated agent pentachloronitrobenzene mixture, mixed with fine sand soil to form medicinal soil, which is used in the root neck.

Toon blight will make the leaves of the toon become yellow and yellow, and one by one dry wounds, and finally let the toon dry up and die, you can choose some pesticides to spray on the leaves of the toon, which can be prevented.

Its symptoms seem to be that there are many black dots on it that are prevented by pesticides, so it should be sprayed regularly, about twice a week, so that it can be effective.

The first leaf is very sparse, the second leaf does not grow much, the third leaf withers, and the fourth whole toon tree does not look very vigorous. Pesticides are sprayed before the toon tree has sprouted.

Due to the low temperature, rainy weather, and low sunlight, it is easy to develop blight. Our local early rice seedlings have to encounter several cold weather every year, the temperature plummets, every year there are several seedlings blight, the light can prevent the seedlings can be relieved, the temperature is abnormal and the temperature rises and falls sharply after the rainy day will cause mildew in the roots of the seedlings, and then cause the stems and leaves to yellow, wilt, the leaves are stretched but not expanded, this is the blight. This disease is very harmful, and if it is not treated in time, it will affect the growth of seedlings in the entire seedbed.

When the rotten seedlings often occur in the area or the seedling field, the disease field is generally sprayed before the soil or after the film is removed after the fall of the valley for prevention, the disease field should be treated with pesticides, and the disease center will be dug up and sprayed for prevention and control in a timely manner, and the agent can be used with 45% methyl frost Fumei double wettable powder 30-40 grams per seedling field.

<> rice blight mainly occurs at the seedling stage, and rarely occurs after transplanting and planting. Moreover, rice seedling raising is an important link in rice production, which determines the annual production and income of rice farmers, and it is very important to raise strong rice seedlings free of diseases and pests and diseases. Standing blight is a soil-borne disease, its pathogens are widely present in the soil, and the seedling growth is weak, the quality is poor, and the disease resistance is not strong, which is the main reason for the occurrence of blight.

The larvae eat the bark of the tree, and there are sawdust visible on the outside, burrow into the wood, and then open upwards to eat, and the hole is filled with sawdust, and there are fecal holes to discharge. In May, the adults fly out and eat the twigs and bark.

Rice blight can be infected by a variety of soil pathogens when the temperature and humidity are suitable, so the first spraying prevention in production is the most economical and effective, and it is also one of the most critical periods for the prevention and control of blight, that is, it can usually be sprayed before the soil cover after the rice falls, and whether the nutrients in the seedbed are sufficient and whether the ventilation is sufficient are the key to the occurrence of the blight. This is the period when the blight is most likely to occur. Therefore, it is necessary to carry out the prevention and control of blight at the weaning stage.

Yes, in fact, all kinds of plant conditions can be prevented in advance, and problems can be solved in time and remedied.

You can still use medicine to remedy, you can go to the farmer's market store and buy some suitable medicine to remedy.

Of course, it can be remedied, this disease is caused by a fungal infection, which can be carried out with carbendazim solution**.

There are mainly beetle insect pests, moth insect pests, scale shell insect pests, etc. Dimethoate oxide emulsion can be used to kill longhorn larvae; In autumn and winter, the branches can be coated with lime, and in summer, emamectin benzoate can be sprayed on the branches; Scale-insect insect pests can be diluted with pyrethyl emulsifiable concentrate and sprayed.

Toon powdery mildew, toon cloud-spotted longhorn disease, mulberry yellow firefly leaf beetle; For powdery mildew, the use of chemical fertilizer should be increased, the ventilation and light transmission conditions should be improved, the diseased branches and leaves should be cleaned up in time, and the phosphorus fertilizer should be increased for the bottom fertilizer, and the excessive use of nitrogen fertilizer should be avoided during the growth period.

In the early stage of toon, 15% powder rust can be used to wet powder 1500 2000 times, sprayed once every 15 20 days, sprayed 2 3 times every 15 20 days, to improve toon rust.

Remove diseased leaves in winter to reduce primary infestation**. Timely drainage and irrigation to reduce humidity and create conditions that are not conducive to the occurrence of diseases; Reasonable fertilization, avoid too late or excessive application of nitrogen fertilizer, appropriately increase phosphorus and potassium fertilizer, promote the growth of toon, improve disease resistance; Reasonable dense planting, pay attention to ventilation and light transmission, improve the microclimate in the forest, and reduce diseases.

(1) In winter, the fallen leaves should be swept away and burned in time to reduce the source of infection.

2) Pharmaceutical prevention and control When the summer spores begin to take shape, use Baumé stone sulfur mixture, spray 1 time every 15 days, each time about 100 kg per mu, spray 2 3 times, have good results.

The use of chemical fertilizers should be increased, and the use of ** should also be removed, and some pesticides should be sprayed to reduce bacteria, pay attention to the light of the sun, etc., so that good control can be carried out.

It can be controlled with pesticides. Some pesticides can prevent the appearance of toon leaf rust.

Summary. Toon blight control methods: 1

At the end of autumn, the infected branches, diseased plants and diseased shoots should be removed in time, and burned in a concentrated manner to reduce the source of bacteria in the field. 2.In situ selection of disease-free plants for retention.

Nurseries or young trees should be appropriately increased with phosphorus and potassium fertilizers, and partial nitrogen fertilizers should be avoided. 3.In winter and spring, the trunk is painted white to prevent sunburn and frost cracking.

Avoid water accumulation in the field after rain during the growing season, and pay attention to ventilation and moisture drainage in the protected area. 4.In the early stage of the disease, timely pesticide prevention and control, seedlings and shoots infected with the disease, you can choose 70% methyl tobuzine wettable powder 600 times, or 40% polysulfur suspension 500 times, or 40% Fuxing emulsifiable concentrate 8000 times, or 30% multi-emulsifiable concentrate 1000 times, or 50% promethane wettable powder 1000 times, or 65% multiguodine wettable powder 1000 times, or 45% Tekeduo suspension 1200 times liquid spray.

When the disease occurs in an adult tree, the lesions can be cut off first, or many deep holes can be made in the lesions and then smeared with a thicker solution of the above-mentioned medicine. 10 15 days for prevention and treatment, 2 3 times in a row according to the condition.

Toon blight control methods: 1At the end of autumn, the infected branches, diseased plants and diseased shoots should be removed in time, and burned in a concentrated manner to reduce the source of bacteria in the field.

2.In situ selection of disease-free plants for retention. Nurseries or young trees should be appropriately increased with phosphorus and potassium fertilizers, and partial nitrogen fertilizers should be avoided.

3.In winter and spring, the trunk is painted white to prevent sunburn and frost cracking. Avoid water accumulation in the field after rain during the growing season, and pay attention to ventilation and moisture drainage in the protected area.

4.In the early stage of the disease, the prevention and control of pesticide residue should be carried out in time, and seedlings and young shoots should be infected with 600 times of 70% methyl tobuzin wettable powder, or 500 times of 40% polysulfide suspension, or 8000 times of 40% Fuxing emulsifiable concentrate, or 1000 times of 30% multi-emulsifiable concentrate, or 1000 times of 50% promethane wettable travel powder, or 1000 times of 65% multi-fruit wettable powder, or 1200 times of 45% Tekeduo suspension. When the disease occurs in an adult tree, the lesions can be cut off first, or many deep holes can be made in the lesions and then smeared with a thicker solution of the above-mentioned medicine.

10 15 days for prevention and treatment, 2 3 times in a row according to the condition.

My toon tree is now starting to wither and lose its leaves, what's going on?

Hello dear. It may be caused by insufficient fertilization, insufficient light, excessive watering at one time, etc.

Avoid pickpocketing and avoid frost, and when there is a frosty climate, it is necessary to take corresponding precautions. When we plant papaya in our hometown, we will basically put some straw on the top of the papaya to avoid frost, because there is straw can play a good role in heat preservation, even if there is frost, it will condense on the straw, and will not condense on the papaya, after the frost weather, the papaya can still survive, but if the corresponding insulation measures are not done, the papaya will die, and the same is true for the dry blight of toon. <>

After loosening, it is easy to appear that the branches of some seedlings wither, in the case of relatively few, about 10%, if it is serious, then 80% will appear to disturb a dead branch on the imitation, which directly affects our planting efficiency.

Avoid planting, planting in the past, the past will also affect the occurrence of this disease. There is a pattern in its growth, if it is done late, for some numbers do not grow into full terminal buds, the temperature is low, then it is easy to frost damage, which will cause this disease. When we plant, we should choose to plant according to the local climate, not too late.

This disease is actually related to insufficient fertilizer and water management, and it is also prone to this situation. No matter what crops are planted, they need to be fertilized and managed, if the water is insufficient and the nutrients are insufficient, then it will be easy to yellow, the plant will be relatively small, and the disease resistance will be relatively poor, and it is easy to cause this disease.

Improper management is not done well, and ventilation and lighting are also easy to cause the disease. When they grow more lush, we need to prune them in time, and the planting can not be too dense, too dense will affect the ventilation and light, this problem is to pay attention to. <>

Finally, some pesticides can be used to control it. Of course, when using pesticides for control, if you find that some of them have dried up, then you should prune them in time, and then spray them with pesticides.

What are the main symptoms of toon blight? What should farmers do to prevent toon wilting? When growing toons, farmers often ask similar questions.

Under normal production conditions, the withering rate is about 10%, and if the production measures are improper or the weather conditions are abnormal, the withering rate is as high as 70-80%. After the occurrence of wilting, the most growing terminal bud loses productivity, which affects the yield and quality of toon buds. Pathogenesis:

According to their origins, Chinese toon varieties can be divided into three ecological types: North China type, Central China type and South China type. The North China type and the Central China type have a short growth time, with a growth period of about 235 240 days, while the South China type has a longer growth time and can grow normally in Guangdong, Guangxi and Yunnan. However, if the seeds propagated in this region are planted in northern China, they will not bud in November and will not lose their leaves.

Early frost is followed by freezing, resulting in a large area of dead seedlings. Second, the sowing is too late and the growing period is insufficient. When the temperature is lower than 10, the plant cannot form a complete terminal bud, the stem tissue is soft, the pith is too large, and the degree of lignification is not enough.

Once cold and dry winds are encountered, frost damage and wilting of shoots can occur. Thirdly, improper management of water and fertilizer leads to "green thirst" in the late growth stage, especially for plants growing on sandy land, due to poor fertility, insufficient soil moisture, small and thin plants, not full of top buds before winter, and serious dead buds. Fourth, the planting density is too high, the plants are too long, and the nutrient accumulation is not enough.

Before winter, the branches are thin, the buds are not full, and dead buds will also appear. Fifth, the climate anomalies in individual years, such as high temperatures in autumn, excessive rain, or excessive fertilizer and water in the late growth period, cause plants to "greedy for green", and suddenly encounter frost, almost all of them wither.

Methods: (1) The origin and ecological type of the production species must be clarified, and the ecological type suitable for the local climatic conditions should be selected in each locality. (2) Sow seedlings in time to ensure that the seedlings have enough growth period, and raise seedlings in the North China Conservation Area, so that the growth period of the seedlings after sowing is not less than 235 days.

3) Scientific management of water and fertilizer, application of fully decomposed organic fertilizer, promote early control, pay attention to the control of water and fertilizer in the bud formation stage. In North China, after topdressing and watering at the end of July, it is generally no longer watered, and only cultivated to prevent "green greed". (4) Reasonable dense planting.

In North China, it is advisable to plant 4,000 to 5,000 plants per mu. (5) When the plant height is 40 50 cm, paclobutrazol with a concentration of 400 500 g is sprayed once every 7 10 days 3 5 times to control the growth and prevent the aboveground withering. (6) Timely stocking of seedlings can also reduce the occurrence of wilting.

7) Spray 800-1000 times Fufengbao No. 1 active liquid fertilizer.