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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.
The following are examples of disease management plans used to control macrocyclic and demicyclic diseases: Macrocyclic disease: Developing a management plan for this type of disease depends largely on whether the urediniospores (rarely termed the "repeating stage") occur on the economically important host plant or the alternate host.
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]
Ophiognomonia clavigignenti-juglandacearum is a mitosporic fungus that causes the butternut canker, a lethal disease of butternut trees (Juglans cinerea). It is also known to parasitize other members of the genus Juglans on occasion, and very rarely other related trees including hickories .
Hemp canker Sclerotinia sclerotiorum: Leptosphaeria blight Leptosphaeria cannabina Leptosphaeria woroninii Leptosphaeria acuta. Olive leaf spot Cercospora cannabis Pseudocercospora cannabina. Ophiobolus stem canker Ophiobolus cannabinus Ophiobolus anguillides. Phoma stem canker Phoma herbarum Phoma exigua. Phomopsis stem canker Phomopsis cannabina
Stem canker has similar symptomology as brown stem rot, fusarium wilt, phytopthora stem rot, sudden death syndrome, tobacco streak virus, and sclerotinia stem rot, which can make distinguishing this disease particularly difficult. [6] Stem canker can be differentiated primarily by its long dark red or brown canker that can extend over multiple ...
Bot canker of oak is a disease on stems, branches and twigs of oak trees in Europe and North America. The casual agent of Bot canker of oak is the fungus Botryosphaeria corticola . Bot canker of oak causes lesions and cankers on a wide range of oaks in Europe and most recently live oaks in North America.
The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe. Symptoms include bleeding cankers on the tree's trunk and dieback of the foliage , in many cases leading to the death of the tree.