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Orchids naturally shed old foliage. If the bottom leaves on a monopodial orchid turn yellow, the plant is probably just getting ready to drop them because the leaves are at the end of their life span.
Every time you take your orchid to the sink to water it, Kondrat recommends inspecting the plant for signs of mealybugs. They look like white fluff on the underside of leaves.
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]
Cephalanthera austiniae is a species of orchid known as the phantom orchid and snow orchid [2] because the entire plant is white except for a few yellow markings on the flowers. The orchid is native to the western United States ( California , Oregon , Washington and Idaho ), and to British Columbia , Canada.
However, the first houseplant I was ever able to keep alive for a respectably long time also happened to be one of the most notoriously stubborn: an orchid. It was unexpected and not without a ...
Aphids: insect pest that sucks sap from plant tissue, excreting a substance called honeydew, which invites other fungal disease. [13] Thrips: insect pest that sucks sap from plant tissue, can kill host plants if infestations become too severe. [14] Mites: tiny arachnid pests that suck sap and remove chlorophyll from leaves, turning them silvery ...
Dendrobium bigibbum, commonly known as the Cooktown orchid or mauve butterfly orchid, [3] is an epiphytic or lithophytic orchid in the family Orchidaceae. It has cylindrical pseudobulbs , each with between three and five green or purplish leaves and arching flowering stems with up to twenty, usually lilac-purple flowers.
The leaves of D. viridis are 5–14 cm long and 2–7 cm wide; leaves at the base of the orchid are obovate to elliptical, while leaves higher on the stem become lanceolate. Two to six leaves are found on one plant, and leafing is alternate. The inflorescence of the orchid is a dense raceme (spike-like cluster) containing 7 to 70 small flowers ...