The celery heart browning syndrome
In the early stage of the heart rot, the celery heart veins turn brown and the leaf margin cells gradually become necrotic and dark brown, and finally the heart rots. This is a physiological disease caused by calcium deficiency. The continuous cropping plots do not pay attention to the use of calcium fertilizers; rain evaporates the available calcium in the soil; the plants have too much nitrogen, lack of water supply or root rot, root knot nematode disease, and the roots can not normally absorb calcium, these factors can Cause calcium deficiency. Control methods: Apply fertilizers with higher calcium content; timely watering and pest control; promptly spray calcium fertilizer after calcium deficiency; spray 0.2% potassium dihydrogen phosphate once every 20 days.
In the early stage of boron deficiency, petioles were abnormally hypertrophied and shortened, and they bent to the inside. The bent part of the inner tissue becomes brown, gradually cracking, and the petioles are distorted and chapped. In severe cases, the edges of the young leaves are browned and the heart leaves are necrotic. This is a physiological disease caused by boron deficiency. In many regions, due to the long-term monoculture of crops requiring large amounts of boron, the effective boron content in the soil is low, and the lack of attention to boron fertilizers is more common. Control methods: Application of 1 kg of multi-fertilizer boron per acre as basal fertilizer before sowing, spraying a 0.1%~0.3% multi-component boron fertilizer solution 2~3 times in the early growth stage.
Black rot symptoms occur at the base of the root neck and petiole, and sometimes endanger the roots. The disease department became black and rot, and many black spots were born on it. Plant growth was stagnant, and the outer 1 to 2 layers of leaves fell off due to decay at the base. The disease is a fungal disease. In addition to the prevention and treatment through the selection of disease-resistant varieties, seed treatment, scientific management and other agricultural measures, 50% thiophanate-methyl WP can be used 500 times or can kill (77% of the hydroxide Copper wettable powder) 500 times spray control.
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