This is a list of diseases of hemp ( Cannabis sativa ) .
Uromyces inconspicuus is a plant pathogen infecting hemp.
Uredo kriegeriana is a fungal plant pathogen infecting hemp.
Trichothecium roseum is a fungus in the Ascomycota firstdivisionreported in 1809.  It is characterized by its flat and granular colonies which are initially white and developed into light pink in color.  This fungus reproduces asexually through the formation of conidia with no known sexual state.  Trichothecium roseum is distinctive from other species of the genusTrichothecium in its characteristic zigzag patterned chained conidia.  It is found in various countries worldwide and can grow in a variety of habitats.  Trichothecium roseumA variety of secondary metabolites including mycotoxins, such as rosinotoxins and trichothecenes, which can be described as a variety of fruit crops.  It can be used as a pathogenic and opportunistic pathogen in the field of various diseases and their impact on the farming industry.  Secondary metabolites of T. roseum , specifically Trichothecinol A, are being investigated as potential anti-metastatic drugs. Several agents including harpin, silicon oxide, and sodium silicate are potential inhibitors of T. roseum growth on fruit crops.    Trichothecium roseumis a plant pathogen and has yet to show a significant impact on human health. 
Stemphylium cannabinum is a plant pathogen that infects hemp.
Septoria cannabis is a species of plant pathogen from the Septoria genus that causes Septoria leaf spot. Early symptoms of infection are concentrated on the vegetative leaves of cannabis plants, followed by chlorosis and necrosis of the leaf. Septoria , which is an ascomycete and pycnidia producing fungus, has been known to attack Solanaceae and Cucurbitaceae species as well as many species species. This genus is known to encompass over one thousand species of pathogens, each infecting a specific and unique host.
Schiffnerula cannabis is a plant pathogen infecting hemp.
Pseudoperonospora humuli is a plant pathogen that causes downy mildew on hops .
Pseudoperonospora cannabina is a plant pathogen infecting hemp. Its spread has been limited to Asia and Europe and is believed to reproduce via sporangia. 
Pseudocercospora cannabina is a fungal plant pathogen infecting hemp.
Podosphaera macularis (formerly Sphaerotheca macularis ) is a plant pathogen infecting several hosts including chamomile , caneberrie , strawberries , hop , hemp and Cineraria . It causes powdery mildew of hops .
Pleospora tarda is a plant pathogen infecting several hosts including alfalfa , red clover , peanut , soybean , lentils , beet , tomato , lettuce , hemp and carnations .
Phyllachora cannabis is a plant pathogen infecting hemp.
Phomopsis ganjae is a plant pathogen infecting hemp.
Phomopsis cannabina is a plant pathogen infecting hemp.
Phoma herbarum is a fungal plant pathogen infecting hop and hemp.
Paralongidorus maximus is a plant pathogenic nematode infecting hemp.
Ophiobolus cannabinus is a plant pathogen that causes stem canker on hemp . 
Ophiobolus anguillides is a plant pathogen that causes stem canker on hemp .
Longidorus maximus is a plant pathogenic nematode .
Fusarium sulphureum is a fungal plant pathogen infecting maize and hemp.
Fusarium oxysporum f.sp. cannabis
Fusarium oxysporum f.sp. cannabis is a fungal plant pathogen infecting hemp.
Davidiella tassiana is a fungal plant pathogen infecting several hosts, including Iris barnumiae subsp. demawendica in Iran . 
Arabis mosaic virus
Arabis mosaic virus is a viral plant pathogen that is known to infect multiple hosts. The pathogen, commonly referred to as Armv, is from the Secoviridae family, and causes Raspberry yellow dwarf virus and Rhubarb mosaic virus.  The Arabis Mosaic virus infects multiple hosts, including strawberries, hop, hemp, grape and geraniums, raspberries, sugarbeets, celery, horseradish, lilac, peach and lettuces.