Broccoli bulbs with high commodity value are dense in texture, white in surface and granular in tiny buds. Everyone likes them in the market, and they are not worried about sales. And some flower balls are not the right color or ugly. This kind of ugly flower ball is deformed and inferior. Cauliflower root deformity. Root deformity is caused by disease. The affected root becomes swollen and grows a tumor-like thing, which is very ugly. The taproot, fibrous root and lateral root are all likely to be infected. The requirements for temperature during the growth period of the flower ball are strict, and the optimum temperature is 24-18 degrees, below 8 degrees, the flower ball grows slowly, and it is easy to be frozen at degrees. When the temperature is higher than 24 degrees, most varieties of flowers are easy to loosen, turn yellow, and the deformed quality becomes worse.

When cauliflower is planted in winter, due to low temperature and drought, cauliflower is more prone to lack of calcium and boron, and it is easy to dry up the tip and edge of new leaves, crack the stems, dwarf the plants, make the leaves light in color, and the flower heads appear crystal-like and slowly turn brown. Generally, the occurrence of open field is heavier than that of greenhouse, and the sides and door heads of greenhouse are heavier than the middle. Before planting the main fields in the seedbed, soil treatment agents such as sodium sulfa or pentachloronitrobenzene should be used for routine disinfection, and ventilation should be carried out in time to reduce humidity after seedling emergence, and the temperature should be controlled not to exceed 28 degrees during the day to avoid high temperature and high humidity growth environment. When the humidity is heavy in rainy days, it is easy to cause stem rot. In such cases, we should pay attention to observation and spray medicine once a few days to prevent it. If prevention is not the main thing, it will be too late to wait until the condition is obvious.

The cortex is easily peeled off from the stem, revealing the dark xylem inside. The disease is limited to the roots and rhizomes of plants and does not develop with vascular bundles. However, the spread of root rot is very fast, and the incidence rate increases after watering. The leaf edge began to scorch, grew slowly, and retted roots appeared in cotyledon stage, and cotyledons died. Root rot at a certain leaf stage will scorch the real leaf. The bed temperature is between 12 and 14 degrees for a long time, especially the low temperature at night, which stops the growth of the growing point and causes the seedlings to die of retting.