Do a good job in the prevention and cure of strawberry gray mold

Strawberry gray mold, also known as rot disease, occurs frequently in strawberry cultivation areas in China. It is one of the most important diseases in strawberry production. Strawberry gray mold mainly infects fruit, pedicel and petiole, with fruit as the most important factor, and strawberry as the most important disease. The production and quality of the product are very influential. The incidence of fruit from the petal intrusion, from the handle close to the beginning. The shape of the palm of the fruit on the back of the fruit was initially irregular. The blush was gradually evident. The area continued to expand to one third to all of the sacral palm. The center of the lesion was water-stained until the entire fruit became brown and rotten. Layer gray mold. The occurrence of this disease requires temperature and humidity conditions. A temperature of about 20°C and a relative humidity of more than 90% is beneficial to the epidemic. Therefore, in the high-fertilizer, densely-cultivated, high-humidity, lush stem and leafy plots, the environment of poorly ventilated and light-permeable greenhouses is conducive to the occurrence of strawberry gray mold.

Prevention:

1, strengthen the cultivation and management. Properly dense planting, do not apply nitrogen fertilizer, increase organic fertilizer and phosphate fertilizer; avoid flooding irrigation, timely drainage after rain.

2, greenhouses to do a good job of ventilation, reduce the humidity in the field. When the sun comes out on a sunny day, it should be open for ventilation.

3, remove the bacteria source. Timely removal of diseased plants, diseased leaves, and diseased fruits.

4, pharmaceutical control. It is mainly prevention. It can be sprayed with 50% chitosan (Kaiser) 1200 times, 35% procymidone 800 times, or 40% pyrimethanil (ash ash) 1000 times evenly when the inflorescence is revealed till the end of the flower. Pharmacy should be used alternately, once every 10-15 days (when the condition is serious about 7 days), 2-3 times in a row. Spraying during flowering should avoid the pollination time of strawberry flowers. Sunny days can be conducted before 10 o'clock in the morning. When the air humidity is high during rainy days, it is best to use 10% procymidone 200 g/mu for fumigation control.

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