Strawberry gray mold, also known as rot disease, greenhouse and open field cultivation are easy to occur, directly harm the flower and fruit, a great impact on the yield and quality. 1. Injury symptoms. The first infestation of Botrytis cinerea begins with infestation of small fruit, and then spreads along the fruit stems to the inflorescence, causing the entire inflorescence to dry and rot. The fruit is invaded, and water-stained, pale brown patches appear on the fruit surface. After that, it becomes dark brown and the tissue is soft rot. Fragrance disappears. Fruits that are susceptible during the growing season continue to rot after harvest. 2. The law of occurrence. Strawberry gray mold is a fungal disease. The pathogenic bacteria overwintered on the damaged plants and formed spores in late spring conditions, spreading with the wind. The optimum temperature for germ development is 20-25 degrees Celsius, the lowest 4 degrees Celsius, and the highest 30-32 degrees Celsius. The conidia germinate at 13.7-29.5 degrees Celsius, but germination is favorable at lower temperatures. Low temperature and high humidity are the leading causes of disease epidemics; planting too dense, partial application of nitrogen fertilizer, excessive plant growth, lack of light in the garden, and poor drainage in the garden are all suitable for disease occurrence. In the early to middle stage, fruit coloring is the weakest and most susceptible to disease. In addition, the degree of morbidity is also related to the variety. 3. Control methods. (1) Selection of disease-resistant varieties. (2) Remove dry and dead leaves in early spring, remove diseased inflorescences at the early stage of disease, remove diseased fruits, reduce bacteria sources, reasonably dense planting, balance fertilization, and properly control watering to prevent plant growth and excessive humidity; Plastic film or firewood cover the ground to avoid direct contact of the fruit with moist soil. (3) Chemical control. From the beginning of the inflorescence, 200 times equal amount of Bordeaux mixture, 50% Zeoxin 500 times, 50% 600mg of diuretic, 75% chlorothalonil 600-800X, 50% Scroton, or 70 % Thiophanate-methyl 800 to 1000-fold, 10% polyoxymethylene WP 100-150 g/mu water 75 kg, 50% Acetaminoglycan 100-135 g/mu water 75 kg, etc. Spray once every 7 to 10 days, spray a total of 3 to 4 times. Control greenhouses or greenhouse strawberry gray mold, can use antibacterial spirit fumigation, 0.1 g per cubic meter of space medication.
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