Prevention and control methods of rice blast, how to treat rice blast

1) Agricultural control.

Disease-resistant varieties should be selected according to local conditions. Before the seedling stage, the diseased rice straw was thoroughly treated to eliminate the source of overwintering bacteria. Sufficient basal fertilizer, skillful topdressing, irrigation should be based on the principle of deep water regreening, shallow water tillering, drying field jointing and shallow water in the later stage. The addition of silicon fertilizer can effectively reduce the incidence of disease.

2) Seed treatment.

Before sowing, soak seeds with 40% carbendazim wettable powder, or 70% thiophanate-methyl wettable powder, or 50% rice blast net emulsifiable concentrate and 40% isorice blast net emulsifiable concentrate. The early rice was soaked with 1000 times the solution for 48 72 hours, and the late rice was soaked with 500 times the solution for 24 hours.

3) Field spraying.

2 Seedling blast occurs at the 3rd leaf stage, and it is controlled by 6% rice spirit for 1 time. When transplanting, soaking the seedlings with 25% 1500 times of 100g EC or 750 times of 20% tricyclazole EC for 3 hours can effectively prevent rice blast. When the diseased leaf rate of the upper three leaves of the rice plant was 3%, the pesticide was applied in time.

To prevent and control panicle blast, the first drug should be applied from the breach to the first panicle stage, and then the second drug should be applied at the full heading stage according to weather conditions. The agent can be 20% tricyclazole wettable powder, or 40% rice blast emulsifiable concentrate, or 40% gram blast disperse emulsifiable concentrate, 75 100 grams per mu, or 50% isorice blast net emulsifiable concentrate, 100 150 grams per mu.

Farmers have issued information about the use of old non-toxic high-lipid film (emulsion) to prevent and control rice blast.

Prevention and control of rice blast.

With non-toxic high-lipid film yield enhancer (emulsion), spray with 200 times of high-lipid film yield enhancer at the rice seedling stage, tillering stage and ear stage, and spray again every other week, with a control effect of 80% to 90%.

Dear I am very happy to have your question, and I see that your question is: how to treat rice blast, rice blast ** method: (1) Choose high-yield, high-quality, disease-resistant varieties, and the selection of disease-resistant varieties is an economical and effective measure to prevent and control rice blast.

2) Strengthen the management of fertilizer and water in the field, rationally apply nitrogen, phosphorus and potassium fertilizers, and increase the application of phosphorus, potassium and silicon fertilizers to improve the disease resistance of rice. (3) pesticide control: choose 75% tebuconazole, oximetrybin, 225-300 grams of water-dispersible granules hectares, control rice sheath blight at the sealing stage and the end of booting, and prevent and control rice blast, ear neck blast, branch blast and grain blast at the end of booting and full heading stage.

Nadidiwen 75% water-dispersible granules (1) is a broad-spectrum fungicide: it can effectively control rice blast, rice koji disease and sheath blight (2) has high bactericidal activity, low dosage and strong preventive effect. (3) Long shelf life:

Disease control time 12 15 days (4) rice biological traits are good (leaves, stems and ears), (5) significantly increase yield, high rice yield (6) use 2 times to stabilize the enemy, can save 20% of nitrogen fertilizer dosage, less nitrogen fertilizer can reduce the risk of disease. (7) The use of stable enemies, rice live stalks mature, prolong the filling time, speed up the filling speed, strengthen the stalks to resist lodging, one medicine and three prevention. Two sprays can increase the yield of rice by 8%-12%, effectively increase the rice yield by 2%-4%, and improve the quality of rice.

Prevention should be more important than treatment of rice blast cultivation and disease, and comprehensive prevention and control technology should be advocated. First of all, it is necessary to select disease-resistant and high-yield rice varieties. Secondly, it is necessary to rationally fertilize and irrigate, pay attention to the combined application of nitrogen, phosphorus and potassium fertilizers, and the combined application of organic fertilizers and chemical fertilizers.

Irrigation controls dryness, wetness, and wetness to promote root growth. If there is fog in the morning, cloudy and cloudy, the air humidity is high, and the conditions such as high temperature, high humidity and strong sunlight are suddenly encountered after rain, medicine should be applied in time to prevent the occurrence of rice blast.

The focus of field application should be on the prevention of more serious ear neck blast. At the end of booting or the beginning of the rice break (5% of heading), the first spray was applied, and the second time was sprayed at the full heading stage, and 60-70 kg of pesticide per mu was sprayed. Commonly used agents (choose one of them) and the dosage per mu are:

250 g of 75% tricyclazole, 100 g of 70% methyl tobuzin, 150 g of rice blast peptide, 150-200 g of 40% rice blast, 125-150 g of 40% isoblast. Different agents should be applied alternately.

Rice blast is also known as rice fever, fire blast and kowtow blast. Rice is susceptible to rice blast throughout the growth period, especially in the seedling stage, tillering stage and early heading stage, especially the rice blast susceptible varieties. The favorable conditions for the occurrence of rice blast are that the temperature is between 20-30°C and the relative humidity is above 90%.

According to the different parts and stages of the disease, it can be divided into seedling blast, leaf blast, joint blast, ear neck blast and granular blast.

Miao plague. It occurs before the three-leaf stage of rice, and mainly harms the bud sheath and bud sheath of rice. At the time of onset, the harmful part is water stains. If not prevented and controlled in time, rice seedlings will turn brown and die.

Leaf blast. From the three-leaf stage to the heading stage, it occurs in the leaves (from the tillering stage to the jointing stage, which is more susceptible to leaf blast). According to the different lesions, leaf blast can be divided into chronic, acute, brown spot and white spot.

1) Chronic leaf blast.

The lesion is spindle-shaped, grayish-white, brown and yellow halos from the inside to the outside, and the veins at both ends of the lesion are long brown bands.

2) Acute leaf blast.

Acute leaf blast is typically characterized by dark green spots with water stains. The shape of the spots is usually nearly round and irregularly rounded, with a gray mold layer on the cotton and leaf backs.

3) Brown spot leaf blast.

The typical symptom of brown spot leaf blast is small brown spots, which mainly occur on the old leaves of the lower part of the rice plant, and resistant varieties can also appear, so we should be vigilant.

4) White spot leaf blast.

The white spot leaf blast spots are white and nearly round white spots. White leaf blast can be transformed into chronic leaf blast or acute leaf blast.

Plague. Nodulation usually occurs in the first and second segments under the panicle. Typical lesions are brown spots at the spike nodes that then expand in the nodes above the nodes.

Eventually, the spike will lose water, shrink and sag, resulting in a very easy spike breakage. White ears appeared after heading of rice blast plants.

Spike neck blast. This lesion is mostly found on the ear and neck, from the main ear trunk to the branch of the first branch, and appears as brown or dark green watery spots. The chain links expand, resulting in water loss and reduced shrinkage. White ears appeared after ear neck heading of rice blast plants.

Granule plague. Grain bursting often occurs in the chaff. Diseased oak plaques are oval-shaped, grayish-white, and often accompanied by a gray mold layer. Rice blast is the disease of the seedling stage in the following year.

Pay attention to prevent rice blast in cultivation.

1) If nitrogen fertilizer is applied excessively or partially during the planting process, it is easy to get infected by bacteria. Nitrogen, phosphorus, potassium, organic fertilizer and chemical fertilizer should be applied at the same time in production.

2) High humidity in the field is also easy to induce rice blast. Enough seedlings should be dried in the field at the tillering stage.

3) In order to prevent the infection of the disease seeds in the previous year, the seeds should be soaked with medicine before sowing.

Rice blast is known as the "cancer of immortality" of rice, which can be infected by rice in southern China from seedling raising to maturity, while in northern China, rice can be infected after transplanting until maturity. Different types of rice blast pose different threats to rice. Importantly, the lesions caused by many other diseases of rice can also become a channel for the infection of rice blast spores, which is why rice is prone to cause associated rice blast when flax spot, bacterial brown spot and other diseases occur.

Therefore, the control of rice blast is the top priority in the rice cultivation process. However, due to the many factors that can cause rice blast, it cannot be effectively controlled at a fixed time or growth period. Only a comprehensive influencing factor can judge whether it is necessary to prevent and control rice blast in time.

1.Timely prevention and control according to climatic conditions. After the rice seedlings reached 6-7 leaf age, they entered the peak tillering stage, and the number of seedlings in the same hole increased significantly, and the number of leaves of the seedlings also increased with the increase of the number of stems.

In conditions of high winds, rainfall, and prolonged hot and humid weather, the leaves rub against each other and some brown spots appear. The main cause is the infection of germs or spores caused by the wound caused by the friction of the blade. If it is in the northern region, the probability of rice blast infection at this stage is limited, and the impact on yield and quality is also limited.

In the southern region, due to the special climatic conditions, it is easy to cause the spores of rice blast to invade from the lesions, thus breeding a large number of lesions on the leaves and cobs. Therefore, after the leaves are injured by special climatic conditions, it is recommended to prevent and control rice blast in time to avoid the spread of rice blast.

2.Control of rice blast according to variety resistance. There are many varieties of rice, with different requirements for effective accumulated temperature, differences in taste quality, difference in yield, and superior and inferior resistance, which can be described as "a hundred flowers blooming".

However, from the perspective of variety validation, rice blast resistance is also one of the important factors in the validation of new rice varieties. Generally speaking, the resistance of rice varieties to rice blast can be divided into resistance, medium resistance and high resistance. When choosing a rice variety, it is best to consult with dealers or other growers to understand the variety's resistance to lodging diseases such as rice blast to decide whether it is necessary to increase the intensity and frequency of rice blast control.

Summary. Hello, I have seen your question and am sorting out the answer, please wait a while What to do if rice blast occurs.

Hello, I have seen your question and am sorting out the answer, please wait for a while What special medicine is used when leaf rice blast is severe.

Rice blast, (leaf blast), the leaves are shuttle-shaped lesions, you can use dichlor, rice blastamide, prochloraz, chunleimycin, tricyclic frustration, rice blast, etc., it is recommended to mix 2 kinds of agents, add potassium dihydrogen phosphate spray, and spray once every 5 days. It is recommended that you use prochloraz, tricyclic minus plus rice blast plus potassium dihydrogen phosphate plus silicone spray for good effect.

Just the seven pills I sent you, and then mix two at random.

If mine is helpful to you, I hope you can give it a thumbs up, thank you!

With pyrazolase ester 10 Fuji No. 1, okay.

You'd better use the seven pills I just gave you.

Hello, I'm glad to answer for youA: Rice blast with rice blast to control rice blast: rice blastamide has low resistance, prevention and ** effect are good, and can effectively prevent new leaves from being infected with rice blast.

Chunleimycin. It belongs to the agricultural antibiotic fungicide, which is generally used in the early stage of leaf blast, with good effect and poor protective effect, so it is recommended to use it with tricyclazole. Prochloraz.

Broad-spectrum fungicide, generally used in the early stage of leaf blast, prochloraz has no systemic property, it is also recommended to use it with tricyclazole, etc., the resistance area is larger, do not use this agent.

Summary. 1) Soaking: Treat rice seeds before sowing. 75% tricyclazole 2000 times was selected, soaked for 24 hours, rinsed with water, and then germinated and sown.

2) Prevention and control of rice seedling blast and leaf blast: mainly focus on the use of drugs in the early stage of the disease. Honda enters the tillering stage within one month after planting, and often checks the leaf blast in the field, and if it is found that there are acute disease spots on the disease center or leaves, it should be treated with pesticides.

To prevent and control rice leaf blast, 5 days before transplanting, spray seedlings with 75% tricyclazole 1500 times as a grafting agent, which can effectively prevent leaf blast. Honda can be sprayed evenly with 100 ml of 40% rice blast emulsifiable concentrate or 80-100 grams of 40% rice blast wettable powder or 100-150 ml of 2% spring leimycin mixed with 45-60 liters of water per 667 per 667.

3) The three types of rice blasts, namely leaf pillow blast, ear neck blast and joint blast, have a great impact on yield, so attention should be paid to general prevention. The prevention of ear neck blast should focus on the protection of rice at the heading stage, especially the breaking stage and the full heading stage are the key periods for prevention and control. Diseased varieties and rice seedlings are tender and green, and the fields with excessive nitrogen fertilizer and severe disease are treated 2-3 times, with an interval of about 10 days.

Generally, the first application is started at 5-10% of the broken head, and the second application can be achieved at the full heading stage.

What medicine is used to prevent and control rice blast?

1) Soaking: Treat rice seeds before sowing. 75% tricyclazole 2000 times was selected, soaked for 24 hours, rinsed with water, and then germinated and sown.

2) Prevention and control of rice seedling blast and leaf blast: mainly focus on the use of drugs in the early stage of the disease. Honda enters the tillering stage within one month after planting, and often checks the leaf blast in the field, and if it is found that there are acute disease spots on the disease center or leaves, it should be treated with pesticides.

To prevent and control rice leaf blast, 5 days before transplanting, spray seedlings with 75% tricyclazole 1500 times as a grafting agent, which can effectively prevent leaf blast. Honda can be sprayed evenly with 100 ml of 40% rice blast emulsifiable concentrate or 80-100 grams of 40% rice blast wettable powder or 100-150 ml of 2% spring leimycin mixed with 45-60 liters of water per 667 per 667. 3) The three types of rice blasts, namely leaf pillow blast, ear neck blast and joint blast, have a great impact on yield, so attention should be paid to general prevention.

The prevention of ear neck blast should focus on the protection of rice at the heading stage, especially the breaking stage and the full heading stage are the key periods for prevention and control. Diseased varieties and rice seedlings are tender and green, and the fields with excessive nitrogen fertilizer and severe disease are treated 2-3 times, with an interval of about 10 days. Generally, the first application is started at 5-10% of the broken head, and the second application can be achieved at the full heading stage.

Rice blast should be controlled with different drugs at different stages.