Common physiological diseases and control of celery

First, the heartbeat veins become brown at the beginning of heartburn symptoms , and the leaf margin cells gradually die afterwards, showing a dark brown color. It is rare in the early stage of fertility, and it usually occurs in 11-12 leaves. The cause of the disease is mainly caused by calcium deficiency. The celery cultivated in summer is prone to heartburn. Prevention and treatment methods: mainly from management, to achieve appropriate temperature and humidity, apply lime to acidic soil, and adjust the acidity and alkalinity of soil to neutral ; 0.5% calcium nitrate can be sprayed at the beginning of the disease. Aqueous solution.

Second, the hollow symptoms spread upward from the base of the petiole, and the white flocculent corked tissue appeared in the hollow part. The cause of the disease is a physiological aging phenomenon, which occurs mostly in sandy soil, and occurs mostly in the middle and late stages of plant growth . In addition, when the soil is dry, celery is frozen and easy to hollow. For prevention and treatment methods, non-sand soil should be selected, full-fertilized organic fertilizer should be applied, and fertilizer should be applied in time to find that the color of the leaves is shallow. When de-fertilization, 0.1% urea aqueous solution can be sprayed 2-3 times.

Third, the petiole cracking symptoms are mainly characterized by the simultaneous cleavage of the stem base together with the petiole. The cause of the disease is caused by boron deficiency ; the second is caused by growth retardation under low temperature and drought conditions ; in addition, the sudden high temperature and humidity, the plant absorbs too much water, causing rapid water filling and cracking. Control methods: one is fully decomposed manure application foot, per 667 m 2 1 kg of borax administered to human, thoroughly mixed with an organic fertilizer; Second spraying an aqueous solution of 0.1% to a 0.3% borax. Pay attention to even watering in management.