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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.
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.
Red boot Melanospora cannabis (secondary on hemp canker) Rhizoctonia soreshin and root rot Rhizoctonia solani: Rust Aecidium cannabis Uredo kriegeriana Uromyces inconspicuus. Southern blight. Sclerotium root and stem rot Sclerotium rolfsii Athelia rolfsii [teleomorph] Stemphylium leaf and stem spot Stemphylium botryosum Pleospora tarda [teleomorph]
Transpiration increases in affected plants. This is because in leaf spots, the plant cuticle, epidermis, and cell tissues, including the xylem may be destroyed in the infected areas. The cuticle protects the leaf and the destruction of these cell tissues results in an uncontrollable loss of water from the affected areas.
The disease attacks during the summer months and causes yellow or orange spots to grow on the leaves of the cotton plant. These spots can cause defoliation, premature openings, broken stems, and reduced yield. [77] Crops with severe outbreaks have been known to incur losses of up to 50%. [76] This disease is controlled with applications of ...
Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color. Drops of orange liquid may be visible on the spots. Later in the season, black dots appear on the orange spots on the upper leaf surface.
A suspected cannabis farm discovered by Sussex Police. More than 500,000 cannabis plants were seized in England and Wales in 2022/2023 (PA)
The mycelium with uredinia looks yellow-orange and powdery, and appears on the underside of leaves as points ~0.1 mm in diameter. Young lesions appear as chlorotic or pale yellow spots some millimetres in diameter, the older being a few centimetres in diameter.