Inquiries: The cauliflower leaves are shriveled, the epidermis is broken, and the back of the leaves seems to be bitten by insects. What is the reason?
Answer: In cruciferous vegetables, thicker leaves, such as cabbage, broccoli (cauliflower), kale, brassicae, indigo, etc., are subject to short-time freezing injury, and most of them are separated from leaf epidermis and leaves. Edema disease. The upper or lower epidermis (commonly seen in the lower epidermis) of the leaves loses their lives and leaves a dead tissue and no longer grows. The mesophyll will continue to grow and break through the epidermis, and thus the phenomenon of leaf epidermal breakdown will occur; the mesophyll grows and leaves the epidermis Not long, limited by the leaf epidermis, the leaves will appear crumpled, uneven thickness and other symptoms similar to viral diseases, so many people in the production are diagnosed as viral diseases, prevention and treatment of viral diseases, resulting in excessive prevention and waste However, it did not have the slightest effect. Instead, it went to search for more viral diseases. After the epidermis ruptured, the mesophyll tissue was exposed and grew into unsmooth leaves. It was similarly eaten by the smaller insects.
This phenomenon occurred more than seven days or more than ten days after apparent frost damage. Frozen cruciferous vegetables, if the seedlings are cold when they are frozen, it is easy to appear early in the bag-balling period of convulsions, especially to the production of cabbage, cauliflower, causing serious losses, as far as possible to avoid early flowers or convulsions. If the seedlings are too cold, it is recommended that they be replanted. If they can not be planted, special attention should be paid to the application of nitrogen fertilizer to delay the development of the flowering period and to reduce the use of phosphorus and potassium fertilizers that promote flowering development. Another important aspect is to ensure irrigation, not because of lack of water to promote twitching and flowering.
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