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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.
Infected plants display white powdery spots on the leaves and stems. [1] This mycelial layer may quickly spread to cover all of the leaves. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant.
Tar spot Phyllachora cannabis: Tropical rot Lasiodiplodia theobromae = Botryodiplodia theobromae: Twig blight Dendrophoma marconii Botryosphaeria marconii [teleomorph] Verticillium wilt Verticillium albo-atrum Verticillium dahliae. White leaf spot Phomopsis ganjae: Yellow leaf spot Septoria cannabis Septoria cannabina
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Pictured is a leaf with white leaf spot disease. Small lesions can be observed on the leaf, which is a symptom of P. capsellae. Conidia can be frequently found on the underside of these lesions. Pseudocercosporella capsellae is a plant pathogen infecting crucifers (canola, mustard, rapeseed).
Regardless of the types of plants, from herbaceous weeds to woody plants, weeds are considered a pest to Christmas tree farms for several reasons. Seedlings are vulnerable to the competition for water and nutrients presented by weed infestations, however, even established trees can be out competed by weed growth. [19]
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Cercospora is a genus of ascomycete fungi. Most species have no known sexual stage, and when the sexual stage is identified, it is in the genus Mycosphaerella. [2] Most species of this genus cause plant diseases, and form leaf spots.