The main symptom of celery's "rotten heart" is the deep green leaves of celery, and the heart is yellow and decayed. This phenomenon can occur in the whole growth period of celery, especially in the seedling stage. The light causes the celery to lack seedlings to reduce production, even severely destroy the seed. Especially the high temperature and rainy environment will aggravate the occurrence of bad celery, and farmers should pay attention to prevention and treatment.
1. Heart rot caused by calcium deficiency in celery is the main cause of celery rot. When celery is deficient in calcium, the young tissue at the growing point is initially brown, and then blacks until dead. At the same time, the disease extends down to the stem base and roots, causing the stem surface to become brown and dry. After the growth point was cut open, the interior was hollow, brown and dry and slightly sour. In addition, the roots of the plants turned yellow-brown to yellow-brown and the amount of root coefficients decreased. While supplementing calcium fertilizer for celery, we must pay attention to supplementing boron fertilizer. Farmers can prevent foliar spraying 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 fertilizers, especially ammonium nitrogen, and appropriately increase the amount of potash fertilizer to facilitate the absorption and utilization of calcium.
2. Boron deficiency. The effective boron content in the soil is low or the plants cannot absorb boron properly due to antagonism. Celery is more sensitive to boron, when the boron absorption is insufficient, the performance of the heart and leaf malformation, irregular retreat between the veins, after the heart was charred, the stem appeared transverse cracks. The boron fertilizer is mainly taken by foliar spray, with 0.1% borax solution, sprayed once every 5-7 days, and sprayed three times.
3. Black rot causes celery rotten heart. Black rot is a fungal disease. It is easy to grow from the base of the stem close to the ground. It can invade upwards. It can cause rot of the heart, and it can turn grayish-brown after infection, and it becomes dark green to dark brown after expansion. Intact, after the rupture of exposed subcutaneous infected tissue black rot, pathogens can be transmitted with rain, vegetable farmers can spray 75% chlorothalonil WP 700-800 times or 50% acetaminophen 600 times for control.
4. Soft rot causes celery to rot. The disease is a bacterial disease. The recent rainy weather causes the ground to be damp, weeds are overgrown, ridges and shades are covered, plants are susceptible to disease, and can spread through rain or irrigation water. Celery soft rot occurs mainly on the base or stem of the petiole and spreads upward to infect the heart and leaves. Symptoms are easily confused with physiological diseases caused by calcium deficiency or lack of boron, but soft rot occurs easily in wet conditions. Odor, careful observation is also better to distinguish. Can be sprayed by spraying 27% copper noble suspension 600 times, 77% killable wet particle powder 500 times or 47% Garnett 600 times.
5. Sclerotinia can also cause celery to die. Sclerotinia mainly infects the base and root parts of the petiole near the ground of the celery, causing the affected parts to be rotted and rot. When the humidity is high, the white hyphae are observed, and the rat worm-like black sclerotia are formed. Farmers can use 40% of the sclerotium net 800 times, 50% fluocin 1000 times or 20% venom 750 times liquid spray control.
6. Although celery likes moist, but high temperature and high humidity, unfavorable to growth, can cause rotten heart to die. After a hot storm, the water in the urn was too long, and the roots were deprived of oxygen, causing the roots to die. Cultivating strong seedlings is an important preventive measure. When raising seedlings, it takes time and seedlings to promote stout petiole and well-developed root systems. Reasonably watering to prevent the humidity in the earthworms is too large. Seedlings of 3-4 leaves need to be dry and wet to promote root development. After hot storms, timely drainage and flood prevention.
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