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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.
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 stem lesion. Wilting and death of leaves above the canker also occurs. [4]
Small water-soaked lesions, maturing into sunken and brown spots with or without a yellow halo. May show concentric rings with purple margins. Necrotic tissue may fall out to appear shot-holed. Leaf spot on many plants and crops. Septoria: Small brown spots, that turns light tan to white in the centre. Leaf spot on many crops Bipolaris
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A sunken canker then forms as the mycelial fan spreads under the bark. As the hyphae spread, they produce several toxic compounds, the most notable of which is oxalic acid. This acid lowers the pH of the infected tissue from around the normal 5.5 to approximately 2.8, which is toxic to cambium cells.
They found that high-density regions immediately around major airports have an 0.8% chance per year of being affected by an uncontrolled reentry, but in "larger but still busy" airspace areas like ...