Mulberry plaster disease
Symptoms can occur during the entire reproductive period, mainly damage the old branches. Mostly formed on the branches of a circular to irregular thick film layer, like plaster paste. There are two kinds of gray plaster disease and brown plaster disease. The former was brown at first, then gradually became gray to brown and black, and later cracked. The latter is chestnut-brown, surrounded by a narrow grayish white band, and the surface of the mycelial membrane is velvety.
Pathogenic gray plaster disease Septobsidium bogoriense Pat. Said Bogor tylobacterium; Brown plaster disease pathogen Septossidium tanakae (Miyabe) Boed. Et Steinm said that Tanaka was a tylobacterium. All belong to Basidiomycotina fungi. S.bogoriense Basidiflora flat, brownish gray to light gray, near the edge of the white, spongy, with an upright column of mycelium, the column thickness 50 to 110um, the original burden of spherical to nearly spherical or oval, diameter 8.4- 10um, the burden on which it grows and twists, with 3 membranes, size 25-355.3-6 (um). The basidiospores are colorless, smooth, and size 14-183-4 (um). In addition to damaging mulberry trees, it can also harm many kinds of fruit trees such as tea and walnuts. The S. tanakae fruit body is brown, and the wall of the constituent mycelium is thick, brown and 3.5 μm in diameter. The underloaded unit cells are colorless, the upper basal spines are spindle-shaped, with 2-4 membranes, and the size is 49-658-9 (um). Small stalks 35-633.5-4 (um), upper bearing spores, spores scorpion-shaped, slightly curved, unit cell, smooth, size 27-404-6 (um), host ibid.
Transmission routes and pathogenic conditions The pathogenic bacteria overwintered on the branches with mycelial membranes, and formed spores for transmission between May and June of the following year. The brachyspore was sometimes attached to the larvae of the scale insects or the health plants, and the soil was moist. Poorly ventilated and light mulberry gardens are easy to develop.
Control methods (1) Low-lying and damp mulberry trees timely drain water after rain, improve plant ventilation and light transmission conditions, and enhance disease resistance. (2) Scrape the mycelial membrane with a knife or bamboo, and then apply Baume 4 to 5 lime sulfur or 20% lime milk.
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