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To make the cuts, grab several clusters of hosta leaves in one hand and prune the leaves with the other. Once the foliage is cut back, add a layer of compost mulch to the border.
Hostas are herbaceous perennial plants, growing from rhizomes which are sometimes stoloniferous, [10] with broad lanceolate or ovate leaves varying widely in size by species from 1–18 in (2.5–45.7 cm) long and 0.75–12 in (2–30 cm) broad. The smallest varieties are called miniatures.
Hostas in the 'Undulata' group include an all-green cultivar, 'Undulata Erromena'; a white-edged cultivar, 'Undulata Albomarginata'; and white-centered (medio-variegated) cultivars that may be grouped according to the amount of white in the leaf. The typical H. 'Undulata' has a wide white center, wider than the green of the margins.
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Hosta virus X does not kill the plants infected, but hostas that have been infected do show a variety of other symptoms, [9] such as: Ink-bleed, which makes the plant look discolored in certain spots, and this effect is generally centered on a vein. An example of this is shown in the photo in this article. [10]
Once on the leaves, the spores germinate and penetrate through the stoma. [2] The subsequent infection causes chlorosis of the leaves in localized yellow spots. As the season continues into summer, apothecia begin to form, giving rise to brown-black leaf lesions that resemble spots of tar. [2] Leaves retain their yellow border from the initial ...
The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis. [2] [3] At least eight races of the pathogen are known to occur based on their virulence on a wheat differential set. [4] The tan (yellow) spot fungus was first described by Nisikado in 1923 in ...
Prunus necrotic ringspot virus (PNRSV) is a plant pathogenic virus causing ring spot diseases affecting species of the genus Prunus, as well as other species such as rose (Rosa spp.) and hops (Humulus lupulus). [1] [2] PNRSV is found worldwide due to easy transmission through plant propagation methods and infected seed. [3]
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