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Septoria cannabis is a species of plant pathogen from the genus Septoria that causes the disease commonly known as Septoria leaf spot. Early symptoms of infection are concentric white lesions on the vegetative leaves of cannabis plants, followed by chlorosis and necrosis of the leaf until it is ultimately overcome by disease and all living cells are then killed.
Septoria are ascomycete pycnidia-producing fungi that cause numerous leaf spot diseases on field crops, forages and many vegetables including tomatoes which are known to contract Septoria musiva from nearby cottonwood trees, and is responsible for yield losses.
Septoria lycopersici prefers warm, wet, and humid conditions. Disease development occurs within a wide range of temperatures; however, the optimal temperatures lie between 20 and 25 degrees Celsius. [4] High humidity and leaf wetness are also ideal for disease development. [2]
Bacterial spot: Xanthomonas campestris pv. vesicatoria: Bacterial stem rot and fruit rot Erwinia carotovora subsp. carotovora: Bacterial wilt: Ralstonia solanacearum: Pith necrosis Pseudomonas corrugata: Syringae leaf spot Pseudomonas syringae pv. syringae: Aster yellows Ca. Phytoplasma asteris Tomato big bud Ca. Phytoplasma sp.; may be ...
Septoria leaf spot Septoria helianthi. Verticillium wilt Verticillium albo-atrum Verticillium dahliae. White rust Albugo tragopogonis = Cystopus tragopogonis. Yellow rust Coleosporium helianthi Coleosporium pacificum = Coleosporium madiae Peridermium californicum [anamorph]
Septoria blotch [4] Septoria tritici; Mycosphaerella graminicola [teleomorph] Sharp eyespot ... Tan spot = yellow leaf spot, red smudge Pyrenophora tritici-repentis;
Internal brown spot = heat necrosis: Oxygen deficiency of tuber accompanying high soil temperature Jelly end rot: Carbohydrate translocation due to second growth Physiological leaf roll: Response to adverse environment Psyllid yellows: Toxic saliva of the potato (tomato) psyllid, Paratrioza cockerelli: Shatter bruise: Mechanical damage to tuber ...
Septoria leaf spot, c. same as b. but older spots, d. pycnida, e. pycniospores. Pycniospores are a type of spore found in certain species of rust fungi. [1] [2] They are produced in special cup-like structures called pycnia or pynidia. Almost all fungi reproduce asexually with the production of spores. Spores may be colorless, green, yellow ...