Bacterial black rot is one of the main diseases of broccoli. It has a wide range of hosts and can also damage a variety of cruciferous vegetables such as cabbage, cabbage, rape, mustard and radish. Heavy crops, frequent rains, partial application of nitrogen fertilizer, and serious pests in the field.
1. Incidence symptoms. In the seedling stage, the cotyledons are water-soaked, gradually browning, withering and spreading to the true leaves, and the veins are small and short strips; the maturity is heavy, which mainly harms the cauliflower leaves and spreads inward from the leaf margin. "V"-shaped yellow-brown lesions, the posterior veins become black, the edges of the leaves appear black rot, the edges produce a yellow halo, and spread to the stems and roots, causing the stems and roots to become black, and the small spheres are grayish black. Corrosive, when the plant is dead, it is dead.
2. Control measures. 1 seed disinfection. Choose disease-free seed seeding, soak seeds with 50% warm water for 20 minutes, or soak seeds with 50% dexamethasone 200 times for 15 minutes, or soak seeds with streptomycin 1000 times for 2 hours, wash and dry before seeding . 2 seedbed soil disinfection. For each 1 square meter seedbed, use 40% pentachloronitrobenzene powder 8g, 40% Fumei double wettable powder 8~10g and mix with appropriate amount of fine dry soil. Sprinkle 1/3 on the surface first, leaving 2/3 Used to cover the seeds when sowing. 3 rounds for change. The two- to three-year rotation of the seriously ill and non-cruciferous crops can reduce the source of the disease in the field. 4 control disease-transmitting pests. Timely prevention and control of Plutella xylostella, Pieris rapae, beet armyworm, aphids, mites, mantle and other pests, so as not to spread diseases. 5 strengthen management. Sowing at the right time, moderate seedlings; timely drainage after rain to prevent soil over-drying and drought; strengthen field management, rational fertilization, and promote plant robust growth to improve disease resistance. 6 clean the countryside. After the broccoli is harvested, the roots and leaves are removed in time, and the fields are buried or burned out: the soil is deeply turned, the fields are dried, and the bacteria source is reduced. 7 chemical control. In the early stage of the disease, you can use 100 times of agricultural anti-751 water solution or 200 times of Fengling, 400% of 14% lycopene copper, 77% of WP can be killed, 50% of sensitized zinc 600 times. Any one of the sprays; or use 50% of the dexamethasone 1000 times solution, 72% of the agricultural streptomycin soluble powder or the new phytomycin 4000 times solution, spray once every 7 to 10 days, even spray 2 ~3 times. Severe disease field can increase the number of spraying as appropriate.
1. Incidence symptoms. In the seedling stage, the cotyledons are water-soaked, gradually browning, withering and spreading to the true leaves, and the veins are small and short strips; the maturity is heavy, which mainly harms the cauliflower leaves and spreads inward from the leaf margin. "V"-shaped yellow-brown lesions, the posterior veins become black, the edges of the leaves appear black rot, the edges produce a yellow halo, and spread to the stems and roots, causing the stems and roots to become black, and the small spheres are grayish black. Corrosive, when the plant is dead, it is dead.
2. Control measures. 1 seed disinfection. Choose disease-free seed seeding, soak seeds with 50% warm water for 20 minutes, or soak seeds with 50% dexamethasone 200 times for 15 minutes, or soak seeds with streptomycin 1000 times for 2 hours, wash and dry before seeding . 2 seedbed soil disinfection. For each 1 square meter seedbed, use 40% pentachloronitrobenzene powder 8g, 40% Fumei double wettable powder 8~10g and mix with appropriate amount of fine dry soil. Sprinkle 1/3 on the surface first, leaving 2/3 Used to cover the seeds when sowing. 3 rounds for change. The two- to three-year rotation of the seriously ill and non-cruciferous crops can reduce the source of the disease in the field. 4 control disease-transmitting pests. Timely prevention and control of Plutella xylostella, Pieris rapae, beet armyworm, aphids, mites, mantle and other pests, so as not to spread diseases. 5 strengthen management. Sowing at the right time, moderate seedlings; timely drainage after rain to prevent soil over-drying and drought; strengthen field management, rational fertilization, and promote plant robust growth to improve disease resistance. 6 clean the countryside. After the broccoli is harvested, the roots and leaves are removed in time, and the fields are buried or burned out: the soil is deeply turned, the fields are dried, and the bacteria source is reduced. 7 chemical control. In the early stage of the disease, you can use 100 times of agricultural anti-751 water solution or 200 times of Fengling, 400% of 14% lycopene copper, 77% of WP can be killed, 50% of sensitized zinc 600 times. Any one of the sprays; or use 50% of the dexamethasone 1000 times solution, 72% of the agricultural streptomycin soluble powder or the new phytomycin 4000 times solution, spray once every 7 to 10 days, even spray 2 ~3 times. Severe disease field can increase the number of spraying as appropriate.
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