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Black rot on orchids is caused by Pythium and Phytophthora species. [1] Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. [1] Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. [1] Pythium ultimum is a pathogen that causes damping-off and root rot on plants. [2]
"Brown or black spots on the foliage are another sign of overwatering." This is a sign of root rot, which occurs when the plant's roots become too soggy and begin to decay.
Dactylorhiza maculata subsp. fuchsii, the common spotted orchid, is a subspecies of flowering plant in the orchid family Orchidaceae. Dactylorhiza maculata subsp. fuchsii is one of Europe's most common wild orchids. It is widespread across much of Europe, with the range extending eastward into Siberia, Mongolia and Xinjiang.
Stethopachys formosa, the orchid beetle or dendrobium beetle, is an Australian insect found in northern New South Wales, Northern Territory and Queensland. [2] They cannot survive in colder climates, and they do not appear in Southern states. [3] This insect feeds on the flowers and leaves of orchids, often causing damage to cultivated plants. [4]
Another common orchid is putty root (Aplectrum hyemale). Putty root is a larger orchid with a flower stalk that can reach between 1- and 2-feet tall and puts out anywhere from eight to 20 flowers.
Diseases in cultivation include root rot, leaf spot disease, rust, mosaic virus, black rot, botrytis petal blight, powdery mildew and southern blight. Though generally, the plant is rarely bothered by pests or diseases, as it can adapt to a wide range of conditions compared to other orchid species. [8]
The world's richest diversity of orchid genera and species is found in the tropics. Orchidaceae is one of the two largest families of flowering plants, along with the Asteraceae. It contains about 28,000 currently accepted species distributed across 763 genera. [3] [4] The Orchidaceae family encompasses about 6–11% of all species of seed ...
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