Medicinal Plant Plantain Powdery Mildew

Symptoms of plantain powdery mildew mainly damage the leaves. The mycelium is born on both sides of the leaf, forming white to contaminating white round spots, with large variations in size, sometimes merging with each other, causing lesions to become one piece or covered with foliage. In October, a small black spot appeared on the white-to-dirty white spot, which was the closed shell of the pathogen.

The pathogen Erysiphe sordida Junell called the pollen germs, belonging to the genus Ascomycorrhea. Ascidian fruit oblate dark brown, connate or near connate, diameter 93-130μm, with 16-32 appendages, many branches, individual branches 1 or 2 times, curved or twisted, often mutual Entangled, 63-156μm long, 0.5-1.3 times as long as the fruit of the ascoma, 3-4 septate, brown or dark brown, more than 1/2 color lighter, 9-14 ascaria, ovate to Irregular in shape, many stalks or short stalks, few sessile, size 50.8-63.530.5-40.6(μm), containing 2 ascospores, individual 4; ascospores with yellow, ovate The oval shape of the rectangle is 18.8-25.412.7-16.3 (μm).

Transmission Pathway and Pathogenic Conditions The pathogens overwinter on the diseased body with the closed capsule shell. When the spring conditions are appropriate, the ascospores are released to infect the plantain and the conidia are produced after the onset of disease. The wind and rain spread and reinfestation occurs. .

Control methods see chrysanthemum powdery mildew.

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