Introduction and control measures of celery leaf spot

Celery belongs to umbelliferae. There are celery, celery, celery three kinds, similar functions, medicinal celery is better. Celery aroma is stronger, called "herbal celery." However, it is not a species of coriander. Celery is rich in protein, carbohydrates, carotene, B vitamins, calcium, phosphorus, iron, sodium, etc. At the same time, it has the effects of calming liver and clearing heat, expelling wind and removing dampness, removing annoyance and swelling, cooling blood and stopping bleeding, detoxifying lung, strengthening stomach and promoting blood circulation, clearing intestines and promoting defecation, moistening lung and relieving cough, lowering blood pressure and strengthening brain and calming. Often eat celery, especially celery leaves, to prevent high blood pressure, arteriosclerosis and so on are very beneficial, and has the auxiliary treatment effect.

Celery is rich in vitamin A, vitamin B1, vitamin B2, vitamin C and vitamin P, calcium, iron, phosphorus and other minerals, in addition to protein, mannitol and food fiber and other ingredients.

Leaves and stems also contain effective ingredients apigenin, bergamot lactone and volatile oil, with blood pressure, blood fat, prevention and treatment of atherosclerosis; neurasthenia, menstrual disorders, gout, anti-muscle spasm also has a certain auxiliary dietotherapy effect; it can also promote gastric secretion, increase appetite. Especially the elderly, due to the small amount of physical activity, less diet, insufficient drinking water and easy to suffer from dry stools, often eat celery can stimulate gastrointestinal motility conducive to defecation.

Introduction and control measures of celery leaf spot

Chinese name of celery leaf spot disease: celery leaf spot disease Chinese alias: early blight

Latin name of celery leaf spot: Cercospora apii Fres.

The symptoms of celery leaf spot disease: mainly occurs on the leaves. At the beginning, the disease spots were yellow-green water-soaked, and later developed into round and irregular shapes. When the disease was serious, the disease spots were connected into pieces and the leaves died. When the air is humid, the spots are densely covered with gray velvety mold. Stems, petioles on the disease spot oval, 3 - 7 mm in diameter, grayish brown, slightly concave, serious disease, the whole plant inverted, high humidity when the disease surface grow gray mold layer.

Morphological characteristics of the pathogen of celery leaf spot: conidia fasciculate, 2~11 roots per fascicle, brown, unbranched, whiplike, transparent, straight or slightly curved, subtruncate at base, with 3~19 septa. Pathogen can infect anise.

Classification attribute of celery leaf spot disease: celery cercospora fungi disease characteristics: the pathogen attached to the seed or the dead body or the seed plant overwintering, becoming the first infection source in the second year. Conidiospores spread by rain, wind, air currents, irrigation water, farming practices, etc. The suitable temperature for pathogen development is 25~30 ℃, and the suitable temperature for conidia formation is 15~20 ℃. Although high temperature and drought, but heavy dew at night, long duration or summer, autumn high temperature and high humidity conditions easy to disease, water shortage, less fertilizer, or excessive irrigation, plant growth is poor, serious disease.

Control measures of celery leaf spot disease:

1)Seed collection or seed disinfection of disease-free plants Seeds are soaked in warm water at 48 degrees Celsius for 30 minutes, and then immersed in cold water for 5 to 10 minutes. Or seed planted after 3 years.

2)High temperature season seedlings to shade, prevent heavy rain, cultivate strong seedlings.

3)More than 2 years of rotation reasonable dense planting, scientific irrigation, to prevent excessive humidity in the field.

4)At the early stage of pesticide control, the pesticide can be sprayed once in 10 days, or continuously for 2 to 3 times.