In recent days, as the weather has warmed up, daytime temperatures in greenhouses have skyrocketed. If management is not properly managed, strawberries are prone to gray mold. Strawberry gray mold is a fungal disease caused by infection with Botrytis cinerea. The pathogenic bacteria overwintered on the damaged plants and sporulated when the spring conditions were suitable, spreading with the wind. The most suitable temperature for the development of germs is 20-25Â°C, and can germinate at 4-32Â°C. Overcultivation, overgrowth of plants, lack of light in the shed or continuous rain, poor drainage, excessive humidity on the ground, partial application of nitrogen fertilizer, and use of hormones can induce the occurrence of gray mold in strawberry in greenhouses. The disease first destroyed the old buds and then threatened the fruit. When diseased on the leaves and stalks, the diseased part produced brownish or dark brown water-stained lesions, and the villous, villous mycelium lumps appeared on the back of the leaves when wet. The onset of flower buds and pedicels turned dark brown and later spread to death. In the early stages of fruit damage, brownish brown spots began to appear and spread rapidly until the whole fruit became soft and dense.
Control methods: 1, selection of disease-resistant varieties. 2. Agricultural control: timely ventilation, control of temperature and humidity in the greenhouse; timely removal of dead leaves and branches, removal of diseased inflorescences in the early stages of disease, elimination of disease, reduction of bacterial sources, rational close planting, balanced fertilization, and basal application of algae Powder to solve the reduction process of soil organic matter mineralization process, reduce the release of toxic gases, promote root respiration, reduce the vitality of pathogens; proper control of watering, to prevent plant growth and humidity in the garden; use of film planting to avoid direct contact with fruit Wet soil. 3. Chemical control and prevention: (1) Smoke prevention and cure of shed medicines, choose 10% procymidone or 45% chlorothalonil smoke agent, 250 grams per acre, closed in a closed greenhouse immediately after being ignited with dark fire 1 At night, the door was ventilated the next morning, once in seven days, three times in a row. (2) In the shed, spray control of pesticides, from the beginning of inflorescence exposure, use the following agents: 50% isoprenil wettable powder 1000-1500 times or 50% bosonacamide water 1000-1500 times every 7 days One spray, spray three times.
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