Symptoms and control of black rot of cauliflower

Cauliflower, also known as cauliflower, cauliflower or cauliflower, is a cruciferous vegetable, a variety of cabbage. The head of cauliflower is a white inflorescence, similar to that of broccoli. Cauliflower is rich in vitamin group B and group C. These ingredients are water-soluble and are easily lost by thermal decomposition, so boiled cauliflower is not suitable for high-temperature cooking or boiling. The original Mediterranean coast, its product organs for white, shortened, fat and tender buds, branches, rachis and other polymerization of the flower ball, is a kind of crude fiber content, fresh and tender, rich nutrition, delicious flavor, people like to eat vegetables.

Cauliflower black rot is one of the main diseases of cauliflower, which seriously affects the overall benefit of cauliflower planting. Then we will understand the symptoms and control methods of cauliflower black rot.

Symptoms of black rot of cauliflower

When the cotyledons were damaged at the seedling stage, the cotyledons became water-immersed, gradually browned, withered and spread to the true leaves, with irregular veins. The disease is serious in the mature stage, which mainly harms the leaves of cauliflower, which spreads inward from the leaf edge, forming "V"-shaped yellowish brown disease spot, the rear leaf vein blackens, the leaf edge appears black rot, the edge produces yellow halo, and spreads to the stem and root, which blackens the vascular bundles of stem and root, and the small floret is gray-black dry rot, and in serious cases, the vegetable plant dies.

Control methods of black rot of cauliflower

① seed disinfection: select disease-free seeds as seeds, soak the seeds in 50 ℃ warm water for 20 minutes, or soak the seeds in 50% Dysenamine 200 times solution for 15 minutes, or soak the seeds in 1000 times solution of streptomycin for 2 hours, wash and dry before sowing the seeds.

Soil disinfection of ② seedbed: for every 1 square meter of seedbed, mix well with 8 grams of 40% pentachloronitrobenzene powder and 8 grams of 40% Fumei Dunn wettable powder with appropriate amount of fine dry soil. Sprinkle 1/3 on the border first, leaving 2/3 to cover seeds when sowing.

③ rotation: rotation of seriously diseased crops with non-cruciferous crops for 2 ~ 3 years can reduce the source of disease in the field.

④ control of disease-borne pests: timely control of Plutella xylostella, Pieris rapae, Plutella xylostella, ape leaf beetles, maggots and other pests to avoid spreading diseases

⑤ strengthens management: sowing seeds at the right time, squatting seedlings moderately, draining water in time when rain starts, preventing soil from over-waterlogging and drought, and strengthening field management and reasonable fertilization to promote the healthy growth of plants so as to improve disease resistance.

⑥ cleaning countryside: after cauliflower harvest, remove the residual roots and leaves in time, and take them out of the field for deep burial or burning: turn the soil deeply, prepare the land, and reduce the source of bacteria.

⑦ medicament prevention and cure: at the initial stage of the disease, one can be sprayed with 100x solution of Nongkang 751water agent or 200x solution of Fengling, 400x liquid of 14% ammonia copper water agent, 500x liquid of 77% wettable powder, or 4000 times liquid of 50% Dysen zinc, or 1000 times solution of 50% Dysenammonium water agent, 72% agricultural streptomycin soluble powder or 4000 times neophytomycin, sprayed twice or 3 times every 7 to 10 days. The number of spraying can be increased appropriately in the development of seriously ill field.