How to treat rice brown spot disease, and what drugs are used to prevent and control rice bacterial

Eliminate the source of bacteria: Diseased seeds should be disinfected, diseased straw should be destroyed, and wild hosts (weeds) near rice fields or ponds should also be cut and destroyed.

2. Fertilizer and water management: shallow water irrigation, scientific fertilization, and string irrigation of diseased paddy fields is strictly prohibited.

3. Pharmaceutical prevention and control: 2% plus 80 100 ml of rice, or 50 carbendazim 100 ml mu, or 25 leaf dry spirit wettable powder 170 340 grams of mu, or 14 glue copper aqueous agent 125 170 ml mu, or 10 chloramphenicol wettable powder 60 70 grams mu, mixed with water 15 20 liters of stem and leaf spray.

What are the causes of brown spots in rice glume shells?

1. Excessive nitrogen application had the greatest effect on the color of glume shell. The application of phosphorus at the panicle differentiation stage or meiotic tillering stage can promote the transport of sugar, accelerate grain filling and seed setting, and improve the seed setting rate and 1000-grain weight. The application of potassium fertilizer at the panicle stage can enhance the stress resistance of rice in the later stage. However, if nitrogen fertilizer is used too much, the plant becomes soft and juicy, easy to lodging and pests and diseases, and the filling speed becomes slower in the later stage, and the rice glume shell is easy to cause the rice glume shell to be gray and dark.

2. A large number of grains on the rice ear are browned, which may be caused by the damage of grain blight. The disease is a fungal disease, in which the bacterium overwinters on rice with conidia, and the next year releases conidia to spread through wind and rain. When the flowering period encounters a storm, the rice ears rub against each other to cause wounds, which is conducive to the infiltration of pathogens.

2-3 weeks after heading, the damage to young young rice is heavier, at first there are small spots on the top or side of the glume shell, and gradually develop into oval spots with unclear edges, and then the disease spots merge into irregular large spots, expand to most or all of the grains, and then turn into dry white, with many small black spots on it; After the milk is matured, the rice grains become smaller, the texture is loose, and the quality decreases; When the rice is nearly mature, there are only small brown spots on the grains, and the rice is easy to form brown husks when the rice is infected by rice blast and rice koji disease at the rice heading and flowering stage.

3. The sowing period is delayed, and the later stage is susceptible to the influence of low temperature cold and dew wind, such as low temperature in the early stage of grain filling, the grain filling speed will slow down, especially the lower half of the rice ear is in the sensitive period of grain filling, the development is stopped after low temperature soaking, the seed setting rate decreases, and then it is impregnated by saprophytes and browns.

4. Gray planthoppers feed on rice ears and produce a large number of metabolites, which has a great impact on the color.

<> rice suffering from bacterial brown spot disease can generally be 50 carbendazim (100 ml mu) or 25 leaf blight wettable powder (170-340 grams per mu % plus rice (80-100 ml mu glue copper water (125-170 ml mu chloramphenicol can be suspected of serving wet powder (60-70 grams per mu) and other drugs mixed with 15-20 liters of water, and then spray the stems and leaves into celery.

The fungicides used for rice brown spot disease can be selected: (1) 2 Chunleimycin (plus rice) 1200-1500 ml ha (2) 14 copper glutamia 2000 ml ha (3) 25 leaf dry azole 2550-5110 g ha (4) 50% chlorobromoisocyanuric acid 750-900 g ha (5) 90% agricultural streptomycin 150 g ha + 25% prochloraz EC 1500ml ha + potassium dihydrogen phosphate 1500 g ha.

The fungicides used in rice brown spot disease can be selected:

1) 2 Chunleimycin (plus rice) 1200-1500 ml hectares (2) 14 copper 2000 ml hectares.

3) 25 pylophyllum 2550-5110 g ha (4) 50% chlorobromoisocyanuric acid 750-900 g ha (5) 90% agricultural streptomycin 150 g ha + 25% prochloraz EC 1500ml ha + potassium dihydrogen phosphate 1500 g ha.

<>1. Spraying: When streaks appear on the rice leaves, you can spray sterilizer for prevention and control. 2. Reasonable fertilization

Formula fertilization technology is used to fertilize reasonably, and nitrogen fertilizer can not be applied partially. 3. Water management: no deep water can be irrigated, nor can it be irrigated.

4. Seed treatment: first preheat the suspicious rice seeds in 50 warm water for 3 seconds, then soak them in 55 warm water for 10 seconds (stir 3 times), then remove the seeds and put them in cold water to cool down.

1. Prevention and control methods of bacterial stripe spot disease in rice

1. Spraying. When it is found that there are spots on the leaves of rice, it can usually be sprayed with fungicides such as thiasen copper, leaf green double, and sterilizer.

2. Reasonable fertilization

Generally, it is necessary to avoid partial application of nitrogen fertilizer, or late application of nitrogen fertilizer, and formula fertilization technology should be used to apply fertilizer reasonably.

3. Water management.

It is not possible to irrigate string water and deep water.

4. Seed treatment.

1) Choose hybrid rice with strong disease resistance to reduce the probability of disease.

2) When carrying out seed treatment, the method of soaking seeds in warm soup can usually be used for suspicious rice seeds, so as to kill the pathogens on the seeds.

3) Preheat the rice seeds in warm water (50) for 3 seconds, then soak them in warm water of 55 for 10 seconds, stir at least 3 times during the soaking period, and then take out the seeds and put them in cold water to cool down.

2. Symptoms of bacterial stripe spot disease in rice

1. Symptoms. (1) In the early stage of the disease, the lesions are water-immersed, the color is dark green, with the development of the disease, the lesions will expand into dark green to yellow-brown thin stripes between the leaf veins, and a large amount of yellow pus will often overflow on the lesions, which are bead-shaped, and when the pus is dry, it will become a gelatinous small particle.

2) When the disease is severe, the stripes will merge into large yellow-brown to withered white spots, which are irregularly shaped, the leaves curl, and a yellowish-white patch appears in the field.

2. Causes of the disease.

1) The environment of high temperature and high humidity is conducive to the occurrence of bacterial stripe disease, and the partial application of nitrogen fertilizer and excessive irrigation will make the disease more serious.

2) After a typhoon or rainstorm, wounds will appear on the rice, and the germs will invade from the wounds or stomata, and spread with the help of wind, rain, dew and other ways.

To prevent and control rice bacterial stripe spot disease, it is necessary to focus on four technical measures.

The first is to block the center of the disease in a timely manner. If sporadic strains are found or the center of the disease is first seen, it should be immediately sprayed and blocked. If the weather conditions are conducive to the onset of the disease, the whole field should be controlled and the surrounding fields should be sprayed to protect them.

The second is scientific application, which can be used with thiazole zinc, thiasen copper, thiobacille copper, chlorobromoisocyanuric acid, trichloroisocyanuric acid, amylolitic bacillus and other drugs. Spray after the dew dries, spray once every 5 7 days, and control 2 3 times in a row. Alternate pesticides.

After spraying, it should be treated in time in case of rain.

The third is to strengthen fertilizer and water management. Do a good job in fitness cultivation, formula fertilization, shallow water frequent irrigation, put an end to string irrigation and flood irrigation, and avoid the flow of water from diseased fields to non-diseased fields.

Fourth, strict quarantine measures. Plant quarantine institutions should strictly quarantine the place of origin, and strictly prohibit the retention of seeds in diseased fields. Rice seeds and paddy in the affected areas can only be transferred after passing the quarantine.

Re-inspection of rice seeds transferred from other areas should be strengthened. The paddy in the diseased field should be harvested and processed separately, and the chaff, straw and nearby weeds should be destroyed in a unified manner.

Rice bacterial diseases spread rapidly, and timely monitoring, correct drug use, and scientific management are important guarantees for achieving good control effectiveness. Regardless of the choice of chemical pesticides or biological pesticides, the prevention and control time is crucial, and the field should be immediately surrounded by spraying from the outside to the inside after the occurrence of the disease center, and the treatment should be made up in time after the rainstorm. The diseased fields should not be irrigated, flooded and recycled water should not be used to prevent the spread of the disease.

Rice bacterial stripe spot disease belongs to quarantine bacterial disease, the disease has a certain epidemic and outbreak, in the past in the rice area of southern China and Southeast Asia rice area occurred seriously, in recent years, Jiangsu, Anhui and other places also occasionally occur, but this year's large-scale occurrence is still rare, rice bacterial stripe spot disease will cause 10%-20% reduction in rice yield, serious areas may reduce yield by more than 50%, rice bacterial stripe spot disease indica rice is more than japonica rice, hybrid rice also occurs more.

Rice bacterial streak disease occurs on rice leaves, which is manifested as the formation of streak on the leaves, which may be easily confused with white leaf blight or rice red blight, but a typical feature of bacterial streak disease is that brown yellow fungus pus can be seen on the leaves, and we can see transparent streaks when the leaves are exposed to sunlight.

Brownish-yellow fungus pus.

Conditions for the occurrence of bacterial streak disease in rice.

Under the micro-headlines released the day before yesterday, some growers pointed out that "straw returning to the field" is one of the causes of rice bacterial stripe spot, in fact, this statement still has some truth, rice bacterial stripe spot disease is mainly spread by seeds and field residues such as straw and other wintering, high humidity weather is an important condition for the occurrence of rice bacterial stripe spot, when the temperature is between 28-30 degrees, typhoon or storm is easy to occur in a large area, generally in June to September, it is rice booting to heading period occurrence, the fungus with rain, Wind is transmitted through wounds, and studies have shown that fields with too much nitrogen fertilizer or too late nitrogen fertilizer are more likely to occur, and the resistance of this disease variety is also quite different, and there have been studies on the mechanism of resistance to bacterial stripe disease in rice, and some progress has been made.