Mustard seedlings must guard against these 4 diseases
The diseases of the seedlings of melons include damping-off, blight, anthrax, and roots. Seedling disease symptoms 1. Overbearing disease: It is a major disease in the seedling stage of the western melon. Damage to seedlings occurs first in water-stained lesions on the base of the seedlings near the soil surface, and the diseased part turns yellow-brown, shrinking and shrinking into a line. Before the cotyledon is withering, the seedlings fall down. 2. Blight: Diseased seedling stems produce oval dark brown lesions, early sicklings wilting at noon, recovery sooner or later, the disease gradually sag, expand the stem around the stem for 1 week, and contract and dry, the plants withered. Onset of light seedlings only formed brown lesions on the base of the stem, and the seedlings grew poorly but did not die. 3. Anthrax: Anthracnose occurs during the entire growth period of the West Melon. The incidence of seedling stage, mainly cotyledon damage, more than a round or semi-circular lesions appear on the edge of the leaf, brown, with black dots and pale red sticky material on the top. 4. Roots: Roots do not grow new roots after seedling emergence. The roots of the young roots are rust-brown and rot. They do not grow new leaves. The diseased seedlings are easily pulled out of the soil. In severe cases, the diseased plants are wilted and dead. Integrated control of disease at seedling stage 1. Treatment of the seedbed soil: Bacterial blight and damping-off of the seedlings of the summer melon are soil-borne diseases. The nutrient soil is disinfected 15 to 30 days before the seedlings are raised. Can be used 70%?f mycophenolate soluble powder 3000 times sprayed on the nutritious soil and mix well and piled up, the amount of each side of the use of 70%?f powdery mildew soluble powder 5 ~ 8 grams. It is also possible to apply the medicament to the surface of the nutritious bauxite before the irrigation seedling bed in accordance with the above-mentioned amount so that it infiltrates into the nutrient soil with the water. 2. To nurture strong seedlings: The seedbed should be well-preserved at night to prevent cold wind and cold invasion and to avoid seedlings freezing. During the day, ventilation and ventilation should be strengthened to reduce seedbed temperature and humidity, so that seedlings grow robustly and increase resistance to disease. The optimum soil temperature for West melon seedling emergence is 20-25°C. The daytime temperature after emergence is controlled at 25-30°C and 15-16°C at night, and cooling and hardening seedlings are started 5 days before planting. West melon seedlings in the three true leaves, if the melon seedlings are crowded, it is easy to grow long, the main reason is that the group within the light is weak, should pay attention to open the gap between seedlings, so that the melon seedlings fully exposed. The night temperature is kept below 15°C, and the bed soil should not be too wet (the guava seedlings will not be wilting at noon). If the seedbed needs to be watered, it should be sunny at 10 to 12 o'clock in the morning. After watering, it should be released and dampened to increase the soil temperature. Seedlings around 3 true leaves can be sprayed with fertilizer to improve the disease resistance of the melon seedlings. 3. Chemical control: When the seedbed begins to sporadically occur, the diseased plants should be unplugged immediately. At the same time, 70%?f of psychic soluble powder 3000 times+plant growth regulator or 30% of the bacteria Emulsion suspension 2000 times + plant growth regulators, 70% thiophanate-methyl WP 800 times + plant growth regulator spray, pay attention to the three agents used in rotation. Striped Bonito,Sarda orientalis,Fresh Striped Bonito,Fresh Sarda orientalis Zhoushan Boda Aquatic Products Co.,Ltd , https://www.baida-aquatic.com