How to treat rice red leaf disease? 10

1. The soil is not suitable, rice is suitable for growing in fertile and soft and humus-rich soil, when breeding rice, if the soil is not suitable, it will lead to poor plant growth, which will make the leaves of rice red, and it is necessary to apply enough base fertilizer to the soil, and spray potassium permanganate for disinfection.

2. Insufficient light, rice needs sufficient light in the growth process, when breeding rice, if it is planted too intensively, it will lead to insufficient light of the plant, so that the branches and leaves of rice wilt and yellow, and the seedlings that grow too densely need to be pulled out to maintain the normal growth of rice.

3. Fertilization is too little, rice is a fertilizer-loving plant, when breeding rice, if the fertilizer is too little, it will lead to malnutrition and red leaves, you need to apply fertilizer 2-3 times during the rice growth period, you can choose urea, potassium dihydrogen phosphate and compound fertilizer, add potassium, nitrogen and phosphorus and other elements for rice.

4. Improper irrigation, rice likes water, when breeding rice, if there is too much irrigation or too little irrigation, it will lead to poor plant growth, and in serious cases, it will make the rice die, and it is necessary to keep the rice field between 3-5 cm to promote the healthy growth of rice and make its leaves green.

Rice red leaf disease can be prevented, in addition to daily water and fertilizer management to thicken the leaf stem, is to spray fungicides.

It is advisable to spray some. Try thiophanate-methyl.

Add some nitrogen fertilizer.

Rice water red disease, also known as rice Donggluvirus disease, is the dwarf and discolored leaves of the affected plants, and the growth declines, and the leaf color is orange to yellow. Indica rice infection is mostly orange or slightly reddish, also known as red leaf disease. Japonica rice is mostly yellow in color.

The young leaves are mottled and the old leaves are rust-stained. Donggrew is a Filipino native language that means recession.

Prevention and control methods: 1) Select disease-resistant (resistant) varieties such as international 26.

2) It should be planted in patches to prevent leafhoppers from spreading poison in early and late rice and varieties with different ripeness. Early rice is harvested early to avoid insect sources from moving into late rice. When harvesting, turn your back to the late rice.

3) Strengthen management, promote early emergence of rice seedlings, and improve disease resistance.

4) Promote chemical weeding, eliminate weeds such as Kanmai Niang, and reduce the source of overwintering insects.

5) Insect treatment and disease prevention. The first generation of nymphs breeding in paddy fields should be controlled in a timely manner, and the peak period when the black-tailed leafhopper migrated to the double-cropping late rice seedling fields and Honda should be seized to eliminate the source of insects before the spread of poison. You can choose 25% thiazinone wettable powder, 100ml per 667m225g or 35% tachylice net emulsifiable concentrate, 100g of 25% sutricarb wettable powder, spray 50L of water, 1 time every 3-5 days, and 1-3 times for continuous prevention.

Rice red leaf disease is not something that can be explained clearly in a few words here, you still have to find your technician to help you investigate, to see what else has appeared, is there any insect to eat?

Rice red leaf disease generally refers to red blight, and the prevention and control of red blight can generally be done with 100-150 grams of 90% crystal trichlorfon or 150 ml of dichlorvos mixed with 50 kg of water per mu, and then sprayed when the paddy field is shallow water.

Other control methods: deep tillage to promote soil maturation, and at the same time avoid continuous no-tillage and intercropping; To transform low-yield fields, soil should be modified for poorly drained muddy fields, and the drainage and irrigation system should be remediated; After the harvest of the previous stubble, plough and dry the stubble in time. Therefore, after the appearance of red leaf disease, the growth temperature should be adjusted, and fertilizers such as phosphorus and potassium should be supplemented, especially potassium fertilizers should not be lacking, such as trim potassium dihydrogen phosphate fertilizer.

Rice red leaf disease is a disease caused by bacteria, mainly harmful to leaves, which can be sprayed with difenoconazole and azoxystrobin.

Phosphate deficiency and bacterial diseases are compared to the actual network** to be sure.

Rice red leaf disease refers to red blight, also known as shrinkage seedling disease, also known as rust disease, commonly known as stiff seedlings. It is mainly due to poor soil environment, poor root development, inability to absorb a certain nutrient element or physiological diseases caused by trauma.

How to control rice red leaves.

1. Rice blast.

1) Growers must pay attention to the criticality of seed selection, and can choose high-quality varieties with strong disease resistance for planting and cultivation, which can ensure that the seeds have good yield, quality, adaptability and stress resistance, improve the ability of rice itself to resist rice blast infection at the root, and prevent the occurrence of rice blast.

2) The seeds of high-quality varieties can be disinfected and infiltrated with 5000 times liquid emulsifiable concentrate (concentration 10%), which can eliminate the surface germs and the infiltration time is about 5 days.

3) The infiltrated seeds can be directly germinated without washing again.

2. Rice bacterial stripe disease.

1) When the field disease is in the point stage, the climatic conditions and the growth of rice plants are suitable for the disease, 20% thiaquazole (Sichuan 018, Ye Kuning, Ye Qingshuang, Ye Ku Z) or 25% thiaquazole wettable powder or 25% Ye Kuling (Yu 7802) wettable powder can be used 250-500 times per mu; 10% leaf withering net (5 oxyphenazine, killing withering, Huinongjing) wettable powder 300 times liquid; 1500 times of 50% sterilization water-soluble powder; 500 times of 14% glue-amine copper aqueous solution; 400 times of 45% dyceym aqueous solution, 12% Shidaoling glue suspension 2000 times solution; 700 times liquid spray control of plant protection spirit water agent.

2) Use 1 time every 5-7 days, spray 2-3 times.

3. Two borers.

1) Winter fallow fields can be ploughed and irrigated before the end of March in winter or early spring of the following year, and early rice grass must be placed away from the late rice fields for exposure, so as to prevent transfer hazards.

2) Late straw should be treated with fuel before pupation after spring warming, so that the larvae and pupae can be burned.

3) From late April to early May (peak pupation to peak moth peak), rice stumps can be flooded with water for 3-5 days, which can drown most of the mature larvae and pupae and reduce the occurrence base.

4. Blight.

1) At the beginning of the disease, you can spray 800 times of 38% oxapyroxystrobin, or 600 times of 41% polyastatine pyrimelamide, or 1200 times of 20% methyl phosphorus emulsifiable concentrate, or 800 times of Pulik water solution, and spray once every 7-10 days.

2) Or dilute the general door god according to 600 times the liquid, 3 liters per square meter before sowing or after sowing and before planting the seedbed watering.

It is rice red blight, commonly known as "rust disease", which is a common physiological disease in rice production. At the time of the disease, reddish-brown spots appear on the leaves, followed by root rot, and bubbles appear when some of the affected plots are stepped on the ground with their feet. Low potassium content in the soil, or insufficient potassium in fertilization, cannot meet the potassium needs of rice, resulting in the occurrence of red blight.

It is recommended to spray potassium dihydrogen phosphate + brassinolide with water according to the instructions, which can effectively alleviate the development and spread of the disease. You can choose to use Chunleimycin or Zhongshengmycin + copper preparation (royal copper, etc.), or you can add potassium dihydrogen phosphate to promote the recovery of leaf function.

If it is a lack of phosphorus, you can directly spray the water-soluble fertilizer of the wet cold forest, or enrich some calcium white phosphorus fertilizer and superphosphate fertilizer, and then it should all come over.

Monoazole and Jinggangmycin were used**.

Prevention and control methods of rice red leaf disease:

1. Crystalline trichlorfon or dichlorvos.

Rice red leaf disease generally refers to red blight, in the prevention and control of red blight, generally with 100-150 grams of 90% crystal trichlorfon or 150 ml of dichlorvos mixed with 50 kg of water, and other shallow water spray in rice fields, can effectively reduce the harm of rice red leaf disease.

2. Other prevention and control methods.

1) Deepen the tillage layer to promote soil maturation, and avoid continuous no-tillage and intercropping;

2) Transform low-yield fields, change the soil of poorly drained muddy fields, and remediate the drainage and irrigation system;

3) After the harvest of the previous stubble, plough and dry the stubble in time.

3. Causes of the disease.

1) Soil discomfort.

Fertile, soft and humus-rich soil, ideal for rice growth. If the soil is not suitable when it comes to rice, it will lead to poor plant growth and red rice leaves. At this time, a sufficient amount of basal fertilizer should be applied to the soil and potassium permanganate should be sprayed for disinfection.

2) Insufficient light.

Rice needs sufficient light during the growth process, and if it is planted too intensively when planting rice, it will lead to insufficient light on the plant, which will cause the rice branches and leaves to wilt and wither. At this time, it is necessary to pull out the densely growing seedlings to maintain the normal growth of rice.

3) Too little fertilization.

Rice is a fertilizer-loving plant, and if too little fertilizer is applied when planting rice, it will lead to malnutrition and red leaves. At this time, it is necessary to apply fertilizer 2-3 times during the rice growth period, and the top dressing can be used as soil chef effect fertilizer to supplement potassium, nitrogen and phosphorus and other elements for rice in time.

4) Improper irrigation.

Rice likes water, if too much or too little water is irrigated when planting rice, it will lead to poor growth of rice plants, and in severe cases, rice will die. Keeping the water level in the paddy field between 3-5 cm at this time can promote healthy rice growth and bring the leaves back to green.

After the appearance of red leaf disease in rice, monoazole alcohol and Jinggangmycin are generally used**, and it is best to take ** at the early stage of red leaf disease. Rice red leaf disease is usually caused by a pathogen, and if the plant lacks potassium, it is more likely to be infected with this disease.

There are many reasons for the occurrence of rice red leaf disease, such as high temperature, long-term water retention of rice, poor rice root system, and potassium deficiency. It is recommended to put water to dry the field, and it can be sprayed with rooting agent plus brassinin plus potassium dihydrogen phosphate plus rice blast, and sprayed continuously once every 5 to 7 days. Appropriately turn the green manure in advance and apply the decomposed organic fertilizer.

Implement shallow irrigation and frequent irrigation, and moderate drying. Combined with seedlings, top dressing of fast-acting fertilizer, application of plant ash and superphosphate. In the field where fertilizer occurs, apply 5 8 kg of gypsum per mu, or sprinkle 30 50 kg of lime.

In short, when red leaves occur in rice at the seedling stage, it is a physiological disease of rice, rice red blight, and field management should be strengthened to improve the soil environment and promote growth with gypsum lime.