Crabs in paddy fields have a deeper layer of water, which is between 10-30 cm. The poor ventilation and light transmission in the field and high relative humidity are more conducive to rice sheath blight and the disease is more prevalent. In order to prevent sheath blight from raising crab rice fields, prevention should be based on agricultural measures. Chemical pesticides should be used with caution to avoid poisoning crabs. Reducing the source of bacteria: After watering in the spring, the sclerotia are recovered by combining with the site preparation and taken out of the field and buried or burned in the sun to remove the weeds in the fields and fields. When straw is used as a fertilizer, it should be thoroughly cooked before being applied to rice fields. Anti-disease and lodging-resistant varieties were selected: the deep water layer in crab-cultivated paddy fields, and the easy and long lodging of rice plants, increased the humidity in the field, which was more conducive to occurrence of sheath blight. Anti-fall and disease-resistant rice varieties should be used. Strengthen fertilizer and water management: In the spring soil preparation, dig 30 cm deep and 50 cm wide in the ditch around the rice fields so as to allow the river crab to inhabit it when it is drained. Fertilizer is mainly based on basal fertilizer and organic fertilizer is applied more. Fertilizer application time should be as early as possible, the end of fertilization before June 10, the two fertilization interval should be short, so as not to affect the crab growth. Crabs should be placed in cages or earthen ponds when top dressing is applied, and the crabs should be released after changing rice in mid-June. Chemical control: Crab raising paddy field at the end of the tillering stage of rice at the end of the tillering stage of 5% or more and the incidence of jointing at the jointing stage to the booting stage of 15-25%, 5% Jinggangmycin per acre with 5% Jinggangmycin at the end of the tillering stage to the full heading stage 100 kilograms of water spray was added. The drug was administered 10 days later. The control effect was over 90%, and there was no adverse effect on crab growth.
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