Raise the root rot during the wintering period of rapeseed
Rape root rot, also known as blight, sheath blight. The most suitable temperature for pathogenic bacteria development is about 25°C. High temperature, continuous rainy weather, and lack of light are easily infected. In general, the phenomenon of rotten roots is caused by continuous rain. Soil viscosity, seedling age is too long and the field drainage is poor, and the humidity is heavy. Its prevention measures are as follows:
The rotation of the rotation of oil crops as far as possible to achieve a re-broadcast for two consecutive years, to avoid heavy crosses with cruciferous crops.
Seedbed treatment: Apply 50kg lime powder per acre or 70% sulphite sodium sulphate wettable powder 1kg Slurry soil 30kg Mix well and spread on the seedbed, mix well into the drug soil, and apply the soil to the soil before sowing. To determine a reasonable seeding rate, seedlings should be seedlings after 3 leaves and time, remove disease, weak seedlings, and pay attention to ventilation and light transmission, reduce the humidity between plants, reduce the incidence of seedlings, and cultivate robust transplanting seedlings. The seedbed period is a critical period to prevent the infection of rape root rot.
Strengthen the management of the fine land preparation, so that the weather is not rainy on the sky, there is no water in the ditch. For fields with low water content and easy accumulation of water, high sorghum deep ditch should be used to reduce the soil moisture in time, promote the development of roots of the seedlings and enhance the disease resistance of the plants. Clear the field sick body concentrated burned.
The rapeseed rape seedlings just entered the initial stage of disease, they should grab the sunny days and adopt the chemical prevention and control in time to inhibit the spread of the disease. Can choose 75% chlorothalonil WP wettable powder 600-700 times, or 50% carbendazim WP 800-1000 times, 70% ene sulfide WP 1000 times, 20% methyl tolclofos Emulsion 1200 times liquid spray control. Spray 60 kg per acre. Severe disease fields are sprayed once every 7 days for 2-3 times, which has better preventive and therapeutic effects.
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