The causes of celery's rotten heart disease and its prevention methods

Celsius production often occurs in the production of celery, which is generally caused by rotten heart disease. Rotten heart disease is an important disease of celery. It is widely distributed and occurs widely. Protected areas and open fields can occur. Usually sporadic disease, diseased plant rate of 5-10%. In severe disease years or a few sheds, the incidence of strains can reach more than 80%, which significantly affects the production of celery.
The rotten heart disease can occur during the whole growth period of celery, and the onset is severe at the seedling stage, and individual plots or sheds can thus be rejected. Early onset, can cause bad species, causing uneven seedlings. The seedlings were infected after unearthing, and most of the growth points or the heart of the leaves became brown and necrotic, dry rot, and developed from the heart leaves to the outer leaves. At the same time, the rhizomes extended to the root system. The rhizomes showed that the roots and stems turned brown and necrotic. The growth of the roots is not normal, and the diseased seedlings stop growing, resulting in the formation of inadvertent seedlings or clustered shoots. In severe cases, the diseased seedlings are necrotic. Onset of light with the growth of seedlings in the young and adult stages continue to develop, so that some young petiole necrosis from the lower brown, and finally rot.

The disease is caused by physiological calcium deficiency, and the diseased plants are often accompanied by bacterial infections in the field. Severity of the disease is closely related to the sowing and seedling weather. It is hot and rainy or heavy rain, strong light, or high humidity in the soil. The disease is heavy. In addition, the soil is barren, viscous, flat planting, and the growth of seedlings and young plants is weak and the incidence is heavier. Partial application of nitrogen fertilizer is also more severe. There is a large difference in resistance between varieties.

Control methods: (1) Choose a heat-resistant, high-quality variety in severely afflicted areas according to local conditions. (2) Choose a soil with good permeability and permeability, use sorghum for planting, pay attention to proper shade, and avoid sun exposure during seedling stage. (3) In order to reduce the production loss and prevent bacterial infection after the onset of seedlings, 0.3% seed weight Garinong (47% Chunleiwang copper wettable powder) can be used for seed dressing before seeding, or soaking for 20-30 minutes with 400 times liquid of Garinong. . (4) Care should be taken to protect the seedlings during raining to prevent rainwater from scouring directly. Nursery to prevent the accumulation of water in the field before the growth. (5) Foliar application of 1% calcium chloride solution 1-3 times at seedling stage. At the beginning of the disease, the diseased seedlings were removed and the drug solution for the prevention and treatment of bacterial diseases was sprayed in a timely manner. It was controlled once every 10-15 days, and the disease was controlled 1-3 times. Applicable copper noble 800 times, Garrinong (47% Chunlei Wang copper wettable powder) 400-600 times liquid, can be killed (53.8% copper hydroxide dry suspension agent) 600-800 times liquid, 25% thiophene Benzazole WP 800 times, 30% urinary ammonia-copper water agent 350 times, neophytin, and streptomycin 5000 times.

Goji Polysaccharides is a rare plant polysaccharides containing protein, which have side chains of polysaccharide composed by six carbon sugars (rhamnose, arabinose, xylose, mannose, galactose, glucose) and main chains of protein composed by 18 kinds of amino acids. The glycoproteins with biological activity is a high-strength immune enhancer.

Wolfberry products with stable quality are all natural, safe, sanitary and fast absorption.Lycium barbarum polysaccharide extraction and purification is divided into two steps. First, the extraction of Chinese wolfberry crude polysaccharides, the second is purified Lycium barbarum polysaccharide. Crude polysaccharides extraction process is as follows: Weigh dried crushed medlar, petroleum ether: acetone (1: 1) reflux degreasing, the solvent was filtered off, the residue was air-dried 80% ethanol off monosaccharide and oligosaccharides. 
The polysaccharide is extracted by water after dissolving the residues such as oligosaccharides in water at 90-100 DEG C, the extract is concentrated under reduced pressure, the polysaccharides are precipitated by ethanol, the precipitates are washed with anhydrous ethanol and acetone, and the lycium polysaccharides are dried under vacuum. The crude polysaccharide is purified by passing the Lycium barbarum polysaccharide through a column of DEAE cellulose with different concentrations of NaCl as an eluent, concentrating the eluates with different salt concentrations respectively under reduced pressure, desalting them by dialysis, and then lyophilizing them differently Grape Lycium glycoprotein.

Modern medical research suggests that wolfberry polysaccharides can improve human immunity and have functions as anti-cancer, cancer treatment, hematopoiesis, liver protection and hypotensive, free radicals removal , anti-fatigue, anti-radiation, and cell activity improvement; Goji polysaccharides can control cells division& differentiation, and regulate cell growth & aging, which is widely used in the pharmaceutical, health food and other fields.

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