Symptoms The northern part of the yam powdery mildew strains in the shadowy tussock branches, leaves, petiole first disease, the outside is not easy to find, to be found when it is very serious. Foliage often covered with a layer of white powder, the later leaves on both sides and petiole, stems are stained with white mildew, later in the powder layer scattered many small black spots, namely pathogenic bacteria closed capsule. Both Inner Mongolia and Henan have occurred.
The pathogen Sphaerotheca paeoniae ZYZhao called the peony monocystic shell, belonging to the phylum Ascomycotina. Synonyms Erysiphe paeoniae Zheng & Chen. Closed capsule shell scattered or slightly aggregated, some arranged radially, spherical to oblate spheroid, brown, size 66-90μm. 7-9 appendages, filamentous, slightly stiffened, 1.5- to 5-fold as long as capsule diameter, 3.6-6.0μm thick, rarely with septum, 1/2 lower light brown or absent Color, no branching. There is a sac. The ascus is broadly oval, measuring 66-8457-66 (μm). There are 8 ascospores, which are elliptical to oblong and have a size of 18-2712-18 (μm).
For the transmission route, disease conditions, and control methods, see Chinese rose and pink powdery mildew.
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