Prevention of rice disease after heading rice

Rice Blight, also known as Blight, is a fungal disease and one of the common diseases in late rice. The disease occurs only on grains, with brown spots on the grains at the beginning of the disease, and gradually expands to most or all of the grain. The incidence of lighter can still be strong, but the rice is loose, easy to break; severe onset of pod formation, affecting production decline. When heading for flowers, in the event of a storm, the grains rub against each other and cause wounds, which is conducive to the invasion of pathogens and the incidence is more serious. Generally in the partial application of nitrogen fertilizer, phosphorus and potassium fertilizer application in the rice field is more serious; cold flooding fields or cold flooding irrigation in paddy fields are also more incidence. Prevention and control of the disease is generally after heading, for severely affected rice fields, 0.5 kg of copper sulfate per mu, 0.5 kg of quicklime, and 100 kg of water can be used to control the spraying of Bordeaux liquid and 75 kg per mu of spray liquid. Or after the head of rice with copper noble (27.12% basic copper sulfate suspension) 30 ml of water 30 kg spray, have a good preventive effect.

Rice smut was one of the major diseases of hybrid late rice, and only part of the grain of each ear was affected. The disease is a kind of fungal disease. It is wintering on the seed adhered to chlamydospore. Under appropriate conditions, the spores germinate. Although the whole heading stage of rice can be invaded, the chance of invading in the flowering period is the greatest. Fall autumn autumn even more serious. Late rice fields with partial or late nitrogen fertilizers are prone to this disease. After the occurrence of the disease, field chemicals can be controlled with 20% Triadimefon EC 1000-1500 times, spraying 50 kg per mu, the control effect is more than 80%, or 40% Weiwei Granule Suspension 200g, against water 50 kg spray. Second, 50% carbendazim WP 500 times, or 40% Thiophanate Sulphur Suspension 400x also has a good control effect.

The disease is infested before and after the heading of late hybrid rice, and appears on the ear of rice grains during the milk ripening period. There are as many as 1-2 grains of diseased grains in one ear, and as many as 10 grains in the case of damaged grains. Can not be strong. At first, the rice koji was very small. Afterwards, it was opened and exposed, showing pale green lumps, the spore seat of the pathogen. The pathogens overwinter in the seeds or soil and infect them again in the next year. The optimum growth temperature of the bacteria is 26°C to 28°C. Therefore, it is less rainy, sunny, and has a high incidence of disease. In paddy fields with partial or late nitrogen fertilization, rice plants with leafy green leaves tend to develop at the time of heading, and the degree of disease varies among different varieties. For the prevention and treatment of rice smut, we must take precautions against spraying 5 to 7 days before heading. If continuous rainy weather misses the appropriate period of 5-7 days before the break, as long as the late rice is used before the panicle, there are also comparisons. Good control effect. The selected pharmaceuticals include: Copper noble and spray 30 kg per acre for 30 kg each time, which can kill the bacteria in the bacteria on the diseased grains to make them shrink and fall off when they are fine and dry, which greatly reduces the amount of disease in the field. The number of balls. In addition, 30% seedling EC, 30% Jiarun EC and 30% Shimiao EC can also be used. All have good control effects.

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