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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.
An aphid infestation can ruin a garden. Learn what causes aphids and how to identify, kill, and control them naturally for healthy plants with no aphid holes. Read This If Aphids Are Eating Your ...
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
Aphids can also transmit viruses and allow sooty mold to take hold. When the population becomes too large, an aphid might grow wings and fly away to find a fresh host plant.
Puccinia thaliae is the causal agent of canna rust, a fungal disease of Canna. Symptoms include yellow to tan spots on the plant's leaves and stems. Initial disease symptoms will result in scattered sori (clustered sporangia), eventually covering the entirety of the leaf with coalescing postulates.
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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 ]
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]