Six factors can cause celery to be "bad"

The main cause of the "bad heart" phenomenon of celery is that the outer leaves of celery are dark green, the heart leaves are dry yellow and rot. Lack of mineral elements or susceptibility can lead to "bad heart". According to different reasons, farmers can take corresponding preventive measures.

1. Calcium deficiency. Heart rot caused by calcium deficiency is the main cause of celery rotten heart. The vegetable grower can prevent it by spraying 0.5% calcium chloride or 0.3% calcium nitrate solution with 0.2% borax solution. At the same time, vegetable farmers should reduce the use of nitrogen fertilizer, especially ammonium nitrogen, and increase the amount of potassium fertilizer to facilitate the absorption and utilization of calcium.

2. Boron deficiency. Celery is more sensitive to boron. When boron absorption is insufficient, it is characterized by heart leaf malformation, irregular chlorosis between veins, and later heart leaf is scorched, and transverse cracks appear in stems. The boron fertilizer is mainly sprayed on the foliar surface, sprayed with 0.1% borax solution, sprayed once every 5 to 7 days, and sprayed 3 times.

3. Black rot. Black rot easily develops from the base of the stem near the ground, and infects upwards, which can cause the heart leaf to rot. After the disease, the affected part becomes grayish brown and expands to become dark green to dark brown. The vegetable grower can spray 75% chlorothalonil wettable powder 700-800 times or 50% heparin 600 times.

4. Soft rot. Soft rot occurs mainly on the base or stem of the petiole, and the upward spread can infect the heart leaf. It can be controlled by spraying 27% copper high suspending agent 600 times, 77% killing wettable micron powder 500 times or 47% plus Ruinong 600 times liquid.

5. Sclerotinia sickness. Sclerotinia sclerotiorum is mainly infested from the base and root of the petiole near the celery, causing the affected part to be immersed in water. When the humidity is high, white hyphae can be seen, and then the black sclerotia of the mouse feces is formed. The vegetable grower can use 40% sclerotium net 800 times solution or 50% chlorhexidine 1000 times solution or 20% carbendazim 750 times solution to spray the control.

6. High temperature and humidity. After the hot rain, the water in the sputum is too long, and the roots are deprived of oxygen, causing roots and rotten hearts. It is an important measure to remind vegetable growers to cultivate strong seedlings. When raising seedlings, it is necessary to plant seedlings. Promote thick petiole and developed root system. Watering is reasonable to prevent excessive humidity in the crucible.


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