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Transmission routes and pathogenic conditions The pathogens overwinter on diseased bodies with conidia. Conidia of late spring caused initial infection and reinfection with airflow.
Medicinal plants Datura rosenbergii symptoms mainly damage the leaves and capsules. Lesions on the leaf blade of diseased leaves are round to near-circular, turn brown after the initial white, the edges are irregular, the size is 2-12mm, and some centers have brownish-brown veins, with a small black spot on them, that is, the pathogenic conidia . In severe cases, lesions merged and the leaves died. The diseased spot on the pods has a ring pattern composed of small black spots. The pathogen Ascchyta daturae Sacc. is called Drosophila sp. Conidiophores were born on the foliage, accumulate, prominent epidermis, spherical to oblate spheroidal, wall brown, membranous, size 80-144μm. Conidia cylindrical, colorless, transparent, upright, slightly rounded at both ends, with a diaphragm, size 6-103-3.2 (μm).