Symptoms harm cannabis leaves and stalks. Lesions in the leaves produce irregular yellow lesions, which turn brown afterwards. A layer of grey-black molds, namely the cysts and sporangia of the pathogen, develop on the back. Infected stems produce lesions with inconspicuous outlines, and sometimes the stems and stems are bent. Distributed in North China, Northeast China, Yunnan and other Ma districts.
Pathogen Pseudoperonospora cannabina (Otth) Curz. said Pseudoperonosphaeria spp. is a flagella flagellum subphylum fungi. Two or five cysts of the cyst cysts were born, protruding from the stomata, 3-4 branches, size 110-2408-10 (μm), sporangia oval, light brown, apical projections, size 30-3616-20 (μm), no oospores.
Transmission routes and disease conditions The pathogens overwinter on mycelia and sporangia. Appropriate temperature, high humidity conducive to the disease.
See rice downy mildew for control methods.
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