Medicinal Plant Mint Powdery Mildew

Symptoms mainly affect the leaves and stems, leaving white powder spots on both sides of the leaves and persisting. Primary amorphous patches, post-fusion, or near-survival, some disappear in later stages.

Pathogen Erysiphe biocellata Ehrenb. It is called Aspergillus subtilis fungus. Mycelium is born on both sides or stems of the leaves, conidia are pod-shaped to columnar or near-columnar, size 22.9-38.113.9-17.8 (μm); capsule fruit dark brown flat spherical, scattered Aging or near-polymerization, size 90-120μm, individual 150μm, parietal cells irregularly polygonal, 6.3-17.8μm in diameter; with 12-69 connective filaments, unbranched or with 1-2 irregularities Branches, curved or curved to kinky, twisted, tangled together, as long as the ascidian fruit diameter of 0.5-1.5 times, individual up to 2 times, brown or light brown, thin wall, rough, few smooth, 1 to 6 pieces, 45 to 215μm long, 258μm wide, 4.3 to 6.3μm wide, equal to coarse or local unevenness; 5 to 18 ascosites, oval or elliptic, nearly spherical or irregular, with Long-handled or sessile to subsessile, containing oil globules, size 48.3–81.325.4–38.1 (μm); with 2 ascospores, individual 3-4, yellowish, ovate to Wide oval, size 20.3-27.913.9-17.8 (μm).

Transmission Pathway and Pathogenic Conditions The pathogenic bacteria are overwintering on the diseased body with ascomygoid or mycelium. The mature invasive sporulation of H. sinensis sheds the initial infection, and the mycelium can also directly produce conidial spread after wintering. During the growth of peppermint, conidiospores can be continuously generated on the leaves, re-infestation can be carried out by airflow, and it is only during the later period of growth that ascospores are produced for wintering. Extensive field management, plant growth is weak and susceptible to disease.

Control methods see chrysanthemum powdery mildew.

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