The typical symptom of this disease is leaf green mottling. Affected seedlings have faded, green, source-type blotches on the leaves and slight petals on the life veins of the heart leaves. Later leaf color significantly lighter or dark green and green mixed green spots, petals, leaf wrinkles, and in severe cases, leaf deformity, wrinkles, plant short, and sometimes death. This disease is spread by aphids, etc., so it is serious when many mites occur. Choose varieties resistant to virus diseases. Spinning is found to be reasonable, and bottle columns are promptly removed. Sow seeds at the right time and shade seedlings. Control aphids in time during the seedling period. Strengthen water management to prevent plant sensory diseases caused by high temperature. Chemical prevention and treatment. -Once in 10 days, chlorobromoisocyanic acid, amino-oligosaccharides, mycotoxin and foliar sprays combined with amino acid biostimulants (Shifang, Shifang)*** 2 ~ 3 times.

The typical symptoms of the disease are polygonal irregular yellow spots on the lower leaves limited by the leaf veins, and white mold on the backs or surfaces of the leaves when humidity is high. When the disease is severe, the spots turn dark brown continuously and wilt. This disease mostly occurs in high temperature and high humidity or low temperature and high humidity environment. Strengthen field management, timely pumping during the seedling period, regulating temperature, dehumidification, timely seedling construction, reasonable dense planting. Chemical prevention and treatment. Low-level fungi (mostly in water or soil, acute cold disease, root rot, downy mildew, infectious diseases, etc.) A cream, ortho cream, cream, acetylene, morpholine, bromine and other agents or 72.2% Placid 600 times the liquid spray, 7-10 days a preventive treatment.

Early cauliflower growth cycle is short, the requirements of the sowing period is very strict, early sowing is prone to early flower oxidation, hairy ball, leaf clip, plucking, rotten ball and other abnormalities, if sowing is too late, it will not show the ball, the long face of the accumulation of anthocyanin, prone to the phenomenon of powder puff. Appropriate sowing machine is a guarantee of high-yield cultivation of autumn Luo broccoli, according to the characteristics of the varieties of real 56, according to the actual situation of local planting, combined with the climatic conditions of the year, reasonable arrangement of sowing time. Take Beijing and Tianjin as an example, it is appropriate to sow seeds from June 10 to July 10 in normal years, and each region should reasonably determine the sowing time according to the actual local planting situation, environmental conditions and the climatic characteristics of the year, and don't blindly sow early or late.

Select 72 blood of the flesh and blood, select the zongmiao, zongmiao growth neat, easy to manage, affordable. The blood is sterilized by 5000 times of potassium permanganate immersion for 2 h, fished out and dried and prepared. Air can choose the vegetable seedling substrate sold on the market, mix evenly with the shower nozzle, and then fill the blood cells, fill the substrate evenly in each hole, and then scrape it off with a wooden board flat, scrape off the unnecessary substrate. After filling the substrate, stack 10 trays in a pile and press the holes evenly so that the pressure depth of the blood cells is 0.5 ~ 1.0 cm, and then place them neatly on the mother board. In order to make the seeds germinate neatly, the seeds were dried before sowing, and the dormancy period was broken by drying them out evenly for 6 H in the sun. Spot 1 ~ 2 blood sugar seeds, cover with vermiculite immediately and scrape flat. After sowing, cover with soil and spray water evenly with a fine snowflake in a stream too strong to allow the seeds to protrude from the blood. The first seepage of water, covered with a lid, sunshine, shade, prevent water evaporation, reduce the temperature of the seedbed.