How to prevent and cure the perforation of cherry blossom brown spot
Symptomatic perforation can be divided into perforation caused by fungi and bacteria. Cherry blossom brown spot perforation is caused by fungi, which is mainly harmful to leaves and also infects new shoots, starting from the lower part of the crown and gradually spreading upward. In the early stage of the disease, there were needle-like purple-brown spots on the front of the leaves, and then expanded into round or nearly round spots with a diameter of 3-5 mm. The brown spots appeared on the edges of the brown spots, and gray-brown mildew spots appeared on the later spots. The edge of the spot produces a separation layer, and the lesion dries up and falls off, forming a perforation.
Second, the law of the disease.
The pathogen of cherry blossom brown spot perforation overwintered in the diseased leaves or tips, and the spores were transmitted by wind and rain the following year, invading from the stomata. It starts in June every year and is seriously ill from August to September. The disease is serious in the year with strong wind and rain, and it is easy to suffer from drought and weak trees in summer.
III. Prevention and control methods
① collects and burns susceptible branches and leaves in autumn to reduce the source of infection.
② should strengthen the management measures, increase the application of organic fertilizer, phosphorus and potassium fertilizer, and prevent drought and stagnant water in time, so as to enhance the tree potential and improve the resistance.
Before and after ③ leaf spreading (especially on seedlings), spray 1000-1500 times solution of Bishi shark, or 65% Dysen zinc 500 times solution or Baume 3-5 degree stone sulfur mixture or 1 Vera 1VL Bordeaux solution to prevent. When the disease occurs, 2000-3000 times liquid of Penicillium can be used to control the spread of the disease in time. You can also use amiceda, carbendazim and so on.
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How to control bacterial perforation and brown spot perforation in cherry blossom leaves?
How to control bacterial perforation and brown spot perforation in cherry blossom leaves? Many small perforations often appear on the cherry blossom leaves, which seriously cause the cherry blossom leaves to turn yellow or even fall off, which is caused by the cherry blossom bacterial perforation disease and brown spot perforation disease. (1) Cherry blossom bacterial perforation: mainly harms cherry leaves. The diseased leaves appeared light brown watery spots at the initial stage, and then gradually formed a nearly round brown or purplish brown spot, surrounded by a yellowish halo, which dried up and fell off in the later stage, forming a perforation. The pathogen of bacterial perforation disease of cherry blossoms is Monococcus flavum.
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How to prevent and cure the root nodule disease of cherry blossoms
The gorgeous cherry blossoms are loved by people, but they are susceptible to a deadly root nodule disease. The disease mainly occurs on the trunk and lateral branches of the root and aboveground parts of cherry blossoms. In the early stage of the disease, the rhizome was swollen with a spherical or hemispherical tumor, and the young tumor was white, soft and smooth. After that, the tumor gradually enlarged, hardened, brown or dark brown, the surface was rough and cracked, and gradually infected the main root, lateral root and even capillary root from the rhizome, and each node expanded into tumors of different sizes, which caused the cherry blossom to grow slowly or even stop growing, and the whole plant withered in 3 to 5 years.
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