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Stem canker on sunflower is caused by the fungal pathogen Phomopsis helianthi (teleomorph = Diaporthe helianthi). [1] There are many "Phomopsis" species that have a broad host range, but "Phomopsis helianthi" is the primary pathogen that infects sunflower, although it has also been seen to infect other, secondary hosts.
Following the colonization of the intercellular spaces, the fungus will reach a vascular strand and spread down the stalk between the leaf and the stem. The disease will spread into as well as between the cells of the xylem. This colonization leads to the invasion and destruction of the stem cortex, which leads to the formation of stem canker. [7]
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]
Butternut canker is a lethal disease of butternut trees, and has no cure.. A plant canker is a small area of dead tissue, which grows slowly, often over years. Some cankers are of only minor consequence, but others are ultimately lethal and therefore can have major economic implications for agriculture and horticulture.
Septoria musiva, correct taxonomic name: Sphaerulina musiva (teleomorph: Mycosphaerella populorum), is an ascomycete fungus [1] responsible of a leaf spot and canker disease on poplar trees. It is native on the eastern cottonwood poplar Populus deltoides , causing only a leaf spot symptom.
A. a. f. sp. lycopersici (AAL) infects only certain cultivars of tomato plants and is often referred to as Alternaria stem canker of tomato. [3] AAL ' s main symptom is cankers in the stem. It resides in seeds and seedlings, and is often spread by spores as they become airborne and land on plants.
Disease develops when conidia land on freshly cut or damaged wood; the conidia germinate in the wood tissue, progressively damaging the host-plant's vascular system. As tissue damage advances around the initial site of infection, the formation of cankers and cell death - or necrosis - will cause eventual dieback of the wood.
Fusarium circinatum is a fungal plant pathogen that causes the serious disease pitch canker on pine trees and Douglas firs (Pseudotsuga menziesii).The most common hosts of the pathogen include slash pine (Pinus elliottii), loblolly pine (Pinus taeda), Monterey pine (Pinus radiata), Mexican weeping pine (Pinus patula), and Douglas fir. [1]