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 bacterial perforation and brown spot perforation.
(1) bacterial perforation of cherry blossoms: mainly harms the leaves of cherry blossoms. 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 a kind of bacteria of the genus Xanthomonas. The pathogen overwintered mainly in the disease spots of the disease buds and school shoots, spread by wind and rain and insects in the spring of the second year, and invaded by stomata, lenticels, bud marks and so on. The disease began from April to May, and the peak period was from June to August. The disease is easy to spread on cloudy and rainy days.
(2) Cherry blossom brown spot perforation: this disease harms the old leaves at first, and then develops to the upper part. The diseased leaves produce purple-brown dots at the beginning, and then expand into concentric plaques with a diameter of about 3 mm. The center of the lesion is white or brown, and the edge is purplish brown. In the later stage, the lesion fell off and formed perforation. The pathogen of cherry blossom brown spot perforation is a fungus of the genus Streptomyces, which overwinters mainly by mycelium in diseased leaves. Bacteria spread with the help of wind and rain, and the disease usually begins in June, with a peak in August. The disease is serious when it is windy and rainy.
(3) Control methods: to prevent and control these two diseases, the withered branches and leaves should be cleared and burned in time. For chemical control, you can spray Baume 3-5-degree stone sulfur mixture or 120-fold equivalent Bordeaux solution before sprouting cherry blossoms. Spray 80% Dyson zinc wettable powder 600 times after leaf spreading, once every 7 to 10 days, 3 times in a row.
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How to control the dry pests of cherry blossoms
Longicorn beetles that harm cherry blossoms usually include longicorn beetles, bare-shouldered longicorn beetles, red-necked longicorn beetles 1, and longicorn beetles occur one generation a year. Catch adults during Eclosion from the end of May to early June: before laying eggs, adults of longicorn beetles bite into the bark a "eight" or "T" shaped groove of about 2 mm and 8 mm in length, and then lay eggs in it. They can find grooves in the trunk during the peak spawning period in mid-late July, and destroy the newly hatched larvae in the cortical activity stage. The larvae are picked out with a grafting knife and are eaten into the xylem.
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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 incidence regularity of cherry blossom brown spot perforation pathogen in diseased leaves or tips
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