Carrot black spot is one of the major diseases in the country. The onset of strains resulted in reduced yields and poor quality.
Symptom identification, petiole, stem on the pathogenesis. The leaves often develop from the tips of the leaves or leaves, producing small brown spots and yellow halos. After the enlargement, it was irregularly shaped dark brown with an inner light brown spot. It was covered with leaves and the leaf margin was rolled up and yellowed from the lower part. When wet, black molds (conidia) are densely stained on the lesions. The pathogenesis of stems and pedicels, resulting in dark depressions in oblong dark browns, is easily broken and the seeds are not full, with pathogens.
Cause: Caused by Alternaria alternata. The germs wintered on the seeds and sicknesses. The high rate of seed colonization caused the seedlings to stand dry. The spores that grow on the new spot in the second year are transmitted through the air stream and invade directly from the stomata, wound or epidermis.
Incidence: Appropriate temperature of 28°C, no incidence below 15°C or above 35°C. The disease affects the south in July and August. Weak fertility and weak growth are aggravated.
Control methods: 1, seed with 0.3% of 50% acetaminophen wettable powder, or 50% thiram WP, 40% seed dressing double dressing after sowing. 2. Implement a two-year rotation. 3, increase base fertilizer and top dressing. 4. Spray 50% acetaminophen wettable powder 1500 times, or 75% chlorothalonil wettable powder 600 times, 70% mancozeb WP wet 600 times, at intervals of 7 to 10 days. Continuous control 2 to 3 times.
Carrot spot disease
Carrot spotting disease is a common disease on carrots, and it is popular in summer and autumn. The incidence of strains affects seed yield and quality.
Symptom identification: Onset of disease on leaves, petioles and stems. The young leaves are round or nearly round in shape with brown spots ranging from 2 to 4 mm. They are enlarged in a spindle or polygonal shape, and are grayish brown in the center with slightly raised edges. When wet, there is gray mold on the back. In severe cases, the lesions are linked together and die from the lower leaves. Petiole and stems are brown spots. The disease is gray and old on the lesion and can be distinguished from melasma. In the field, it is often mixed with melasma.
The cause was caused by Cercospora carotovora. The pathogens wintered on the inside and outside of the seed and on the surface sickness. The spores produced in the following year were transmitted by wind and rain.
Incidence conditions: Occurrence during summer high temperatures. The previous lack of fertilizer and drought, weak plant growth, followed by heavy rain, heavy fog or poor drainage and other diseases.
Control methods: Same as carrot black spot, see the item.
Carrot soft rot
Carrot soft rot, also known as rot, is a common disease that occurs in the south. Planting disease is heavy.
Symptom identification: The main damage to the fleshy roots. Chronic disease in the field, wilting after the first part of the yellow leaves. In acute cases, the whole plant suddenly wilted and withered. The diseased plants were examined and the rhizomes were softened by water-soaking. The meaty part turned grayish brown and softened and rotted, and the spilled juice smelled bad.
The cause was caused by E. carotovora, which is the same as the soft rot of cabbage.
Incidence conditions: The pathogens invade from natural wounds, mechanical wounds, and insect infestations. The wounds are often caused by prolonged drought, heavy rain, storms, cultivating uncultivated soil, and damage to underground and ground pests. In the summer and autumn, it is hot and rainy, and the incidence of bad drainage is heavy.
Control methods: 1 Practice crop rotation with field crops for 2 years, or dry crop rotation. 2, Gaochun live cultivation, should not be too dense, good ventilation, strengthen drainage, 3, early prevention and control of ground and underground pests. 4, after the onset of the appropriate control of watering. 5. The diseased plant was found to be removed. 6, at the beginning of the disease, spraying 72% of agricultural streptomycin sulfate deep powder 4000 times, or 14% ammonia solution of copper water 300 times, Feng Ling 200 times, every 7 to 10 days 1 times, spray a total of 2 times .
Vitamins are a type of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. In terms of physiological functions, vitamins are neither a raw material for tissues nor a substance for supplying energy, but they are an indispensable substance for the body. It has many types and different chemical structures. Most of them are the components of the coenzyme (or prosthetic group) of certain enzymes. They are the indispensable compounds for maintaining the normal growth (growth, health, reproduction and production function) of the body. It plays a catalytic role in the body to promote the synthesis and degradation of major nutrients (proteins, fats, carbohydrates, etc.), thereby controlling metabolism. Vitamins are essentially low-molecular organic compounds. They cannot be synthesized in the body, or the amount synthesized is difficult to meet the needs of the body, so they must be supplied from the outside. The daily requirement of vitamins is very small (usually measured in milligrams or micrograms). They are neither a raw material for body tissues nor a substance for energy supply in the body. However, they do not regulate material metabolism, promote growth and development, and maintain physiological functions.
Vitamin K2 MK-7, Vitamin C, Vitamin E, Vitamin K2, Vitamin H, Vitamin D3
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