Prevention and treatment of strawberry gray mold in greenhouse

Strawberry gray mold, also known as rot disease, is a disease that is highly prone to occur in greenhouse cultivation. It directly affects flowers and fruits, and has a great impact on yield and quality.

1. It is a symptom. The grass mold gray mold first infects the small fruit, and then spreads along the fruit stem to the inflorescence, so that the whole inflorescence is dried and rotted. The fruit was invaded, and the fruit surface showed a water-stained pale brown plaque, which turned dark brown, and the tissue softened, producing a dark gray mold layer, and the fragrance disappeared. The fruit that is susceptible to growth during the growing period can still continue to rot after harvesting.

2. The law occurs. Strawberry gray mold is a fungal disease. The pathogen is carried on the victim plant, and spores are formed when the conditions are suitable, spreading with the wind. The optimum temperature for the development of pathogens is 20 ° C ~ 25 ° C, the lowest 4 ° C, the highest 30 ° C ~ 32 ° C. Conidia can germinate at 13.7 ° C ~ 29.5 ° C, but it is beneficial to germination at lower temperatures. Low temperature and high humidity are the main factors of disease epidemic; planting too dense, partial application of nitrogen fertilizer, excessive plant growth, insufficient indoor light, poor soil drainage, etc., 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.

3. Control method. Remove dead leaves and leaves in time, 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 indoor humidity; cover with plastic film or firewood Ground, avoid direct contact of fruits with moist soil. Starting from the inflorescence, use 200 times equal amount of Bordeaux mixture, 50% sensitized zinc 500 times solution, 50% melamine 600 times solution, 75% chlorothalonil 600 to 800 times solution, 50% kelly or 70 % methyl thiophanate 800 ~ 1000 times liquid, 10% oxytetracycline wet powder 100 ~ 150 g / ag of water 75 kg of drugs, sprayed every 7 to 10 days. It is also possible to use a 45% keeling agent for 1000 grams per mu.
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