In the cold winter, planting celery in greenhouses should prevent these five major diseases from happening.
Celery heart rot
Heart rot is often caused by the application of nitrogen fertilizer and excessive potassium fertilizer, while the temperature in the greenhouse is too low, and the air is dried and the absorption of boron is blocked. At the beginning of the disease, leaf edge rot will occur, and with the occurrence of heart rot, the plant will also show some symptoms of calcium deficiency, which will lead to necrosis of young tissue in the growth point of the plant.
Control method: apply more organic fertilizer to control the temperature inside the greenhouse, and not excessively control water.
Celery hollow
The appearance of hollow symptoms is mainly due to insufficient or excess fertilizer, and low temperature and dryness are also an important reason. If gibberellin is administered at this time, the celery hollow phenomenon will be further aggravated.
Control method: apply enough base fertilizer, timely irrigation, heat preservation and cold prevention, use less or disable gibberellin.
Celery
Plant splitting is mainly caused by some cultivation methods that inhibit growth in the early stage of growth, and later promote growth, which causes the plants to expand rapidly. Symptoms: As the plant grows and develops, longitudinal cracking occurs at the base of the petiole of the outer blade of the stem base.
Control method: Pay attention to the growth method of the whole plant in the growth period, but not the method of inhibition.
Leaf edge decay
This symptom has a certain relationship with heart rot, mainly due to calcium deficiency in plants.
Control method: apply enough base fertilizer
Celery stem split
The stem splitting of the plant is mainly caused by the interference of the absorption of boron by the plant. This phenomenon mainly occurs on the outer leaves.
Control method: Apply 0.1% borax aqueous solution for foliar topdressing or apply a small amount of borax in the soil.
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