Can rice blast be cured? How to treat rice blast

How to manage upland rice seedlings and yellow seedlings now?

Yes**, but there is a possibility of reduced production. Rice temperature disease, also known as rice fever, fire blast, kowtow blast, hanging neck blast, is one of the important diseases of rice, which can cause a large reduction in yield.

It mainly damages leaves, stems and ears, and can be divided into seedling blast, leaf blast, joint blast, ear neck blast, and grain blast.

Prevention and control: In the early stage of the disease, tricyclazole, rice blast, difenoconazole, carbendazim, gram blast powder, isorice blast net, bacterial toxin and other alternate spray prevention and control, once every 5-7 days, leaf temperature should be 2-3 times in a row, and the ear neck blast can be prevented and controlled in time at the heading stage, booting stage and full heading stage. The harm of this disease can be mitigated by these methods.

Rice blast is one of the important diseases of rice, which can cause a large reduction in yield, and in severe cases, the yield is reduced by 40% to 50%, and even no grain is harvested. It occurs evenly across rice regions around the world. This disease occurs in various places, among which the leaves and nodes occur more, and the occurrence can cause different degrees of yield reduction, especially the ear neck blast or joint blast occurs early and severe, which can cause white ears and end production.

In recent years, the annual occurrence area of rice blast in Guangdong is not less than 500,000 mu, and there is a trend of increasing year by year, local outbreaks are not uncommon, at present, rice blast may occur in any year and any season in the province. You can consider rice blast and rice blast products. Rice blast Kang or rice blast Kang is diluted by 500 times, and the whole plant is sprayed evenly, and it is advisable not to drip water, and the medicine is used once every 7 days.

Weifang Aofeng Company's rice blast can be the first rice blast.

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.

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.

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.

1. Rice seeds should be selected from disease-free fields or lightly diseased fields, and the seed disinfection effect of bacterial seeds is obvious.

2. The selection of disease-resistant varieties is an economical and effective measure for the prevention and control of rice blast, and it is also a key measure for comprehensive control.

3. Strengthen cultivation management and improve rice disease resistance.

4. Grasp the key and spray protection in a timely manner.

Chemical control: 750 grams of 30% rice disease wetted powder mixed with water per hectare are sprayed routinely. Routinely spray with 40% Fuji No. 1 EC 900-1050ml mixed with water per hectare.

Spray 900-1200 grams of 13% rice cleaner wettable powder with 600-750 kg of water per hectare. 1500 grams of 20% tricyclazole wettable powder mixed with water per hectare.

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%. It was reported by the Farmer ** Agency (July 18, 93).

(1) Agricultural prevention and 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.

To prevent and control leaf blast, apply pesticides immediately when there are lesions in the field, the principle is to control a little and block a piece. The control of ear neck blast was applied once at the rice break and full heading stage, and the target fields were the fields with leaf blast in the early stage, the fields of susceptible varieties, and the fields that produced tender green in the later stage. The application agents are mainly tricyclazole, Fuji No. 1 and other special agents for the prevention and control of rice blast.

1. Cultivated land selection: deep ploughing of the land, application of foot fertilizer, irrigation of the bottom moisture. High-quality disease-resistant varieties were selected, and seed soaking and seed coating agent + new high-fat film seed dressing treatment were carried out (which can effectively isolate viral infection, do not affect germination and swelling absorption function, strengthen respiratory intensity, and improve seed germination rate and seedling emergence rate).

After sowing as required, spray the seedling surface with a new high-fat film to prevent bacterial infection and make the young seedlings grow healthily.

2. Water and fertilizer management: the field should be moist, dry and wet, and the field should be dried in a timely manner to enhance the plant's own immunity; It is necessary to apply more farm fertilizer, increase phosphorus and potassium fertilizer, and spray new high-fat film at the same time to protect moisture and fertilizer to promote absorption, and effectively prevent rice blast.

3. Pharmaceutical prevention and control: do a good job of monitoring, spray 40% Fuji No. 1 emulsifiable concentrate and new high-fat film in the early stage of the disease, and spray 2 times in seriously ill fields, with an interval of 7-10 days.

Rice leaf blast should generally be at the beginning and peak stage; The prevention and control of panicle blast should generally be at the first heading stage and the full heading stage. Pesticide rice blast will also occur at the seedling stage, generally in the tillering stage to begin to observe, early detection, the earlier the application, the effect.

In fact, the simplest control is to dispose of the previous straw or keep it away from your rice field, and clean up the rice field. Because the disease occurs because the pathogen overwinters in the straw or weeds in the field, and the disease ...... the next year

Generally, it is treated once each at 4 5 leaves and before transplanting. Leaf blast can be immediately treated when the acute type of lesions increases day by day, 75 100 grams of 20% tricyclazole wettable powder per mu, and the amount of 60 75 kg of ear blast is the focus of prevention and control, generally in the breach and full ear treatment 1 time, if necessary, in the early stage of grain filling, 75 100 grams of 40% Fuji No. 1 emulsion per mu, the amount of liquid medicine is 60 75 kg. When spraying, it is necessary to rush before the rain, and in case of continuous rain, it should be seized to catch the gap between the rain stops.

Many people don't know when and how to prevent and control rice blast.

Rice blast can be prevented and treated alternately with tricyclazole, allicin, formabi, chlorothalonil, carbendazim, methyl tropium, prochloraz, chunleimycin, copper humate, etc.

At the same time, it is recommended to add brassinin and micro-fertilizer to improve the disease resistance and growth ability of the plant.

Due to the production process, content, and hidden ingredients of pesticide companies, please go to the local distributor to seek the ideal insecticide and better solution according to the condition.