Symptoms are mainly marijuana leaves, round-brown lesions of newborns, grayish-white afterwards, white center, and black spots on the upper part of the pathogen, which are the conidia of the pathogen. The disease is similar to spot blotch. Conidial organs are mostly arranged in a round shape. If necessary, the microscopic pathogens need to be distinguished. Distributed in Liaoning, Jilin, Zhejiang and other provinces.
There are two kinds of pathogens: Phyl10sticata cannabis (Kirchn.) Speg., and P. straminella Bres. Macrophoma straminella (Bers.) Died called Artemisia capillaris, which are all fungi of the subphylum Aspergillus. The conidia of P. cannabis was initially buried in the host tissue and then penetrated through the epidermis to expose the spheroids. Conidiophore cells are colorless, oval to cylindrical, straight or curved, 4-62-2.5 (μm) in size, and have 1-2 oil spots. P.straminella conidiophores are born in foliar, spherical to oblate spheroid, upper wall is thick, dark brown, size 96-150μm, conidia are oval or oval, colorless and transparent, single cells, both ends With 1 oil ball, size 5-92.5-4 (μm).
Transmission routes and conditions, control methods, see brown leaf spot of jute.
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