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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.
The first signs of an aphid problem might be yellowing, curling leaves. Aphids can also transmit viruses and allow sooty mold to take hold. When the population becomes too large, an aphid might ...
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.
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
Bright orange milkweed aphids (Aphis nerii) usually emerge toward the end of summer and feed in clusters on the stems and leaves of common milkweed, swamp milkweed, and other milkweed plants ...
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. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant.
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