First of all, the black spot disease of cauliflower, this disease is mainly harmful to leaves and epidemics, the onset of the initial stage will produce black spots, after expansion will become gray-brown round spots, long-term unmanaged, it will lead to its leaves become yellow and early withered, which affects the rate of seedling emergence as well as the main harm to the leaves, petioles, pedicels and angular fruits and other parts. Seedlings and adult plants can be. Damage. Leaf damage, the first nearly round green spots, expanding, the middle dark brown, the edge of light green, with or without obvious whorls. Surface when wet. Dense black mold.

With The larvae bloom with Bt emulsion 200 times, or with 5% inhibition of tai pao emulsion liquid, egg hatching bloom with 5% sharp JinTe suspension per 667 square meters 17ml - 34ml, add water 50L - 75L, or 5% inhibition of tai pao emulsion 2000 times liquid, or 5% inhibition of tai pao emulsion 2000 times liquid, or 5% inhibition of tai pao emulsion 2000 times liquid, or 5% inhibition of tai pao emulsion 2000 times liquid. The eggs are incubated at the peak of the incubation period with 5% Rejent Suspension 17ml--34ml per 667 square meters with 50L--75L of water, or 5% Inhibition of Tai Bao emulsion 2000 times liquid, or young. Before the 2nd age of the insect, it was used and gathered in the back of the leaf into a mass, secreting yellow honeydew causing the flower. Cabbage leaves yellow and eventually fall off. In addition, aphids are also vectors for the spread of viral diseases, causing yellowing and even death of the plant. According to the experience of Qingjiang Crane, this disease should be prevented, and once the center plant appears in the field, the disease expands rapidly. , it is difficult to recruit. Even if continuous. Drugs, can only barely control the disease, so prevention in advance is quite important. To.

After the white dew, it is the critical period of cabbage field management, precipitation began to increase across the country, especially after this year's fall, precipitation is generally more than in previous years, high temperature and rainy days lasted. Long time, for a variety of cabbage disease. Pests create the conditions for the breeding, which belongs to the bacterial black rot of cabbage. Tube bundle disease, in the cabbage seedlings, adult plant period will be onset, resulting in plant vascular necrosis black. Disease in the cabbage seeds before emergence, will lead to not be able to emergence; seedling victimization, cotyledons show a water-soaked, gradually withered, leaf sowing at the right time, watering at the right time in the seedling period, reasonable squatting, timely pulling out of the field diseased plants and take out of the field and buried y, and the disease holes sprinkle lime disinfection.