What is the symptom of cherry blossom brown spot perforation disease?
Symptoms of cherry blossom brown spot perforation: the disease occurs on leaves, shoots and fruits. But the main harm to the leaves, on both sides of the leaf to produce round or subcircular spots, about 1 to 4 mm in diameter, the edge is clear, slightly ringed, sometimes purple or reddish brown in the periphery, grayish white or brown in the center, and slightly wheeled. In the later stage, there are occasionally gray-brown mildew on both sides of the disease spot, that is, the conidium, especially on the back of the leaf. The disease spot often dries up and falls off, forming a perforation, and the holes are neat at the edge of the disease spot. The perforated leaves fell off early, the disease spots on the new shoots were purple-brown, and grayish-brown mildew was also produced on the spots.
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Value and use of cherry blossoms
Cherry blossoms are very famous in the world flower sea and are the national flower of Japan. During the blooming season, Japanese people flock to watch the cherry blossoms, and the scene is very warm. The cherry blossoms are numerous, colorful and charming. It is a pleasure to listen to the piano and enjoy the cherry blossoms. "when it rains softly in March, cherry blossoms suspect apricot blossoms" and "red cherry trees are newly planted in the small garden, watering the branches is easy to travel." it shows that in the courtyard beautification, the cherry blossoms in full bloom can make people stop and enjoy, like a trip, do not want to leave. Cherry blossoms can be planted in pieces or alone. When planting alone, it can be matched with Jingshi and lawn, which is childish and pleasant. Cherry blossom bonsai
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Occurrence and control of perforation of cherry blossom brown spot
Symptoms: the leaves start brown, grayish brown or purplish brown dots, gradually form round spots, non-waterlogged, opaque, there is no yellowish green halo around the spot, diameter 2: 4 ┨, the lesion boundary is clear, the periphery purplish brown. In the later stage, the middle part was white or brown, with slight wheel lines, and the disease spot withered and fell off, forming irregular perforation. 2. Occurrence regularity: the pathogen overwintered on the fallen leaves and spread by wind and rain in the following spring. The disease began in June, and the peak period was from August to September. When the rainfall was large, the disease occurred and prevailed, the tree was weak and the disease was serious. 3. Prevention and control methods:
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