Strawberry gray mold is also known as rot disease, which is the main disease in strawberry producing areas. It is easy to occur in greenhouse and open field cultivation, directly affecting flowers and fruits, and has a great impact on yield and quality.
Harmful symptoms. The gray mold of strawberry begins to occur after the flowering, and the pathogen first infects the small fruit, so that the fruit surface exposed to the wet soil first occurs, and then spreads along the fruit stem to the inflorescence, so that the whole inflorescence is dried and rotted; the fruit is invaded, the fruit surface Water-stained pale brown plaques appear, dark brown afterwards, soft rot, and the fragrance disappears. In the wet conditions, the diseased part of the mouse gray mold layer. The fruit that is susceptible to growth during the growing period can still continue to rot after harvesting.
The law occurs. Strawberry gray mold is a fungal disease caused by Botrytis cinerea infection. The bacteria overwinter on the damaged plants, and when the spring conditions are suitable, spores form and spread with the wind. The optimal temperature for the development of pathogens is 20-25 °C, the lowest is 4 °C, the highest is 30-32 °C; the conidia can germinate at 13.7-29.5 °C, but it is favorable for germination at lower temperature. Disease occurrence is closely related to environmental conditions. Low temperature and high humidity are the main factors of disease epidemic; planting too dense, partial application of nitrogen fertilizer, excessive plant growth, insufficient sunshine in the park, continuous rainy rain, poor drainage of the garden, and large ground humidity are suitable for disease occurrence. The disease resistance is the weakest in the early to mid-term of fruit coloring, and it is most susceptible to illness. In addition, the degree of disease is also related to the variety.
Control methods: 1. Select resistant varieties. 2. Agricultural control: remove dead leaves and leaves in early spring, remove diseased inflorescences at the beginning of the disease, remove diseased fruits, reduce bacterial sources; rationally close planting, balance fertilization, and properly control watering to prevent plant growth and excessive humidity in the park Cover the ground with plastic film or firewood to avoid direct contact with the soil. 3, chemical control: starting from the inflorescence, use 200 times the same amount of Bordeaux mixture, 50% dexamethasone 500 times solution, 50% carbendazim 600 times solution, 75% chlorothalonil 600 to 800 times solution, 50% Suo Ke Ling or 70% methyl thiophanate 800 ~ 1000 times liquid, 10% oxytetracycline WP 100 ~ 150 g / mu water 75 kg, 50% phlegm wettable powder 100 ~ 135 g / mu + 75 kg of water and other chemicals, spray every 7 to 10 days, a total of 3 to 4 times; to control greenhouse or greenhouse gray mold, can be used fumigation fumigation, 0.1 grams per cubic meter of space.
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