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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.
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 ...
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.
Platanthera blephariglottis, commonly known as the white fringed orchid or white-fringed orchis, is a species of orchid of the genus Platanthera.It is considered to be an endangered species in Connecticut and Ohio, a threatened species in Florida, Maryland and Rhode Island, exploitably vulnerable in New York, [6] and susceptible to be threatened in Québec.
Each branch of the flowering stem bears between two and ten white, long-lasting flowers on a stalk (including the ovary) 20–35 millimetres (0.79–1.4 in) long. Each flower is 60–70 millimetres (2.4–2.8 in) long and 50–80 millimetres (2.0–3.1 in) wide with the sepals and petals free from and spreading widely apart from each other.
Platanthera dilatata, known as tall white bog orchid, bog candle, or boreal bog orchid is a species of orchid, a flowering plant in the family Orchidaceae, native to North America. [ 2 ] [ 3 ] [ 4 ] It was first formally described in 1813 by Frederick Traugott Pursh as Orchis dilatata .
Odontoglossum ringspot virus (ORSV) is a plant pathogenic virus that belongs to the family Virgaviridae. It is one of the most common viruses affecting cultivated orchids, perhaps second only to the Cymbidium mosaic virus. [1] It causes spots on leaves and colored streaks on flowers. [1]
Caladenia longiclavata, commonly known as the clubbed spider orchid, is a species of plant in the orchid family, Orchidaceae and is endemic to the south-west of Western Australia. It is a widespread and common orchid with a single, hairy leaf and one or two greenish-yellow, white and red flowers and which grows in the area between Perth and Albany.