The scientific name anna indica L. is alias phoenix, banana, and blood red. Is a plant of the family Canna, medicinal rhizomes and flowers. With heat and dampness, tranquilizing blood pressure function. It is generally planted everywhere. Symptoms Leaves, stems, and leaf sheaths can be killed. Leaf lesions are mostly spindle-shaped, a few are oval, brown, late dark brown, gray or gray central gray, often with concentric ring pattern. When the humidity is high, both sides of the lesion are gray moldy, the fruiting body of the pathogen. In severe cases, the lesions fuse into irregular large patches with partial or total leaf blight. When leaf sheaths and stems are damaged, the diseased tissues subside, forming long or irregular brown spots, and also gray mold layer. The pathogen Pyricularia cannaecola Hashioka called Pyrus pyrifolia, a fungus belonging to the genus Fungi. The conidiophore stems are mainly found on the back, slender, relatively straight, the top of the knee-shaped, brown to brown, smooth surface, the size of 55-1613-5 (μm); spore cells sprouting, axis extension, spores After detachment, a short cylindrical dentate was retained; conidia were solitary, inverted-pyramidal, umbilicus slightly prominent at base, nearly colorless to pale blue, smooth surface, 3 cells, no contracture at fusion membrane , size 17-296-8 (μm). Transmission Pathways and Pathogenic Conditions The pathogens use mycelia and conidia to overwinter on sick bodies. The conidia produced in late spring are transmitted to the host by wind and rain, and initial infection and reinfection are carried out. Control methods (1) Pay attention to the clean garden and focus on burning the diseased body. (2) Spray 50% Carbendazim WP 1000 times or 25% Benzophenone EC 8D 0 times in the early stage of disease.
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Medicinal Plant Cannabaria