Strawberry ash disease, also known as rot disease, greenhouse and open field cultivation are prone to occur, directly harming flowers and fruits, have a great impact on yield and quality.
Symptoms mainly affect flowers, leaves and fruit, but also damage the leaves and petioles.
Most of the disease starts from the flowering stage. The bacteria initially invade from the unsuccessful flower or the weaker part of the plant, causing the flower to appear light brown and necrotic and rot, producing a gray mold layer. Leaves invade from the base of the old yellow leaves, forming a "V"-shaped yellow-brown spot, or infestation along the falling parts of the petals, forming a nearly circular necrotic spot, with less pronounced roten on it, sparsely sparse Grey mold.
Fruit infection begins with the remaining petal or near or in contact with the ground. It can also invade from the site of contact with the diseased tissue in the early stages. It appears as a water-stained grayish-brown necrosis, and then the color becomes darker, the fruit rots, and the surface becomes dense. Gray mold layer. Petioles onset, pale brown necrosis, shrinkage, sparse gray mold produced on it.
?? Pathogen? Botrytis cinerea Pers. is a semi-known Botrytis cinerea fungi. The spores of the diseased fungi are numerous and sometimes produce sclerotia.
?? The characteristics of the disease? Mycelia, mycelia with the disease or sclerotium in the soil in winter. Spread through air currents, watering or agricultural activities. Temperature 0 ~ 35 °C, relative humidity more than 80% can be the disease, with a temperature of 0 ~ 25 °C, humidity above 90%, or water on the surface of the plant suitable for hair? High humidity, or watering after a rainy day or low-lying Water accumulation, etc., is particularly favorable to the occurrence and development of the disease. According to another survey, the planting of the flat planting or planting of the cover film is serious; the diseases of high ridges and plastic film cultivation are light.
?? Prevention methods
?? 1, completely remove the diseased leaves after harvest. Before transplanting or seedling preparation, use 65% Tamycin WP 400 times, or 50% Polymyxin WP 600 times, or 50% amifenone WP 400 times, or 45% Tec Multi-suspension 600 times liquid, sprayed on the surface of the film, soil and walls, and sterilized.
?? 2, using high ridge plastic film or drip irrigation water-saving cultivation, use of UV blocking membrane inhibition of sclerotial germination. Pre-flowering, flowering and fruit setting period and spraying before spraying, focus on flower protection and fruit protection. Increase the air volume after watering.
?? 3, once the disease, should be promptly carefully removed diseased leaves, diseased flowers, diseased fruit, etc., put the plastic bag with a shed, outdoor proper handling. After the onset, the management temperature should be appropriately increased.
??4, drug control. At the beginning of the disease, Shijiale 40% suspension 1500 times, 50% nellikon wettable powder 1200 times, or 65% tabulin WP 600 times, or 5% polymyxin WP 800 times, Or 50% Triflumizole WP 400 times, or 40% Tecdo suspoemulsion 800 times, or 10% Polaroid WP 600 times spray, focus on spray spray. To protect the land, use 6.5% Trimethoprim dust 1 kg/mu dusting, or use 20% Turkoyan smoke 0.3-0.5 kg/mu smoke, the control effect is more ideal.
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