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Black spot of rose is the single most impactful disease of roses globally. Every year around 8 billion flowering stems, 80 million potted plants and 220 million garden rose plants are sold commercially. [7] All species of roses (Hulthemia, Hesperrhodos, Platyrhodon and Rosa) are affected by black spot
Black spot (Diplocarpon rosae) Black spot (class Leotiomycetes: family Helotiales) Diplocarpon rosae syn. Marssonina rosae – Marssonina rosae causes black spots on leaves. [4] The spots, which may be as much as 12 mm across, are generally circular and have an irregular edge often with a yellow halo. Leaves frequently turn yellow and fall early.
The main fungal diseases affecting the leaves are rose black spot (Diplocarpon rosae), rose rust (Phragmidium mucronatum), rose powdery mildew (Sphaerotheca pannosa) and rose downy mildew (Peronospora sparsa). Stems can be affected by several canker diseases, the most commonly seen of which is stem canker (Leptosphaeria coniothyrium).
[1] [2] [3] 'American Beauty' has prickly shoots, dark green foliage and is winter hardy up to −29 °C (USDA zone 5), but is susceptible to the fungi diseases mildew, rust and black spot. [2] It is well suited as cut flower, and can be grown in greenhouses, in containers or as garden rose, planted solitary or in groups. [3] [4]
Rosa banksiae Rosa persica. There are currently four subgenera in Rosa, although there has been some disputes over the years. [3] The four subgenera are: Hulthemia (formerly Simplicifoliae, meaning "with single leaves") containing one or two species from Southwest Asia, R. persica and R. berberifolia (syn. R. persica var. berberifolia) which are the only species without compound leaves or ...
Beach rose hips, like those of other rose species, are edible and can be used to make jams, syrups, tea, or eaten raw. [11] This species hybridises readily with many other roses, [5] and is valued by rose breeders for its considerable resistance to the diseases rose rust and rose black spot.
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Rosa 'Sally Holmes' is a white shrub rose cultivar, bred by Robert Holmes in Great Britain in 1976, and named in honor of his wife, Sally. It was created from stock parents, Rosa 'Ivory Fashion' and Rosa 'Ballerina'.