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Eventually these regions will grow into larger, brown to tan lesions and eventually into large cankers. Cankers are found on the stem and will have a sunken border. Cankers can be long, up to 6 inches, but do not appear until flowering. [3] Other early symptoms can include necrosis and bronzing of intervenial areas of leaves at or above the ...
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.
Symptoms of blackleg generally include basal stem cankers, small grey lesions on leaves, and root rot. The major yield loss is due to stem canker. The fungus is dispersed by the wind as ascospores or rain splash in the case of the conidia. L. maculans grows best in wet conditions and a temperature range of 5–20 degrees Celsius. Rotation of ...
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
Alternaria alternata is a fungus causing leaf spots, rots, and blights on many plant parts, and other diseases. It is an opportunistic [ citation needed ] pathogen on over 380 host species of plant. It can also cause upper respiratory tract infections [ 1 ] and asthma in humans with compromised immunity.
These symptoms affect different areas on the plant and can be used to diagnose this disease along with other factors. In the trunk and cordon of the plant symptoms include cankers coming out of the wounds, wedge shaped lesions when cut in cross sections and dieback. Dieback is characterized as a ‘dead arm’ and a loss of spur positions.
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The disease is noted by cankers, leaf spots, and necrosis, as well as twig dieback. [1] On healthy leaves, the necrosis begins apically at the margins, extending back along the midrib, occasionally reaching the base and causing complete blight of the leaf. Twig dieback also starts apically and works towards the center of the plant.