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The virus infects more than 648 species of plants including important horticultural and agricultural species such as fuchsia, tomato, orchids, [2] and lettuce (especially romaine). As the name implies, the main symptom on plants is necrotic spots that appear on the leaves.
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]
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]
The virus has not often been reported in wild orchid populations. [2] It can be found in a wide variety of orchid genera [3] but does not infect plants other than orchids. [2] Once an orchid is infected, the virus spreads throughout the infected plant in a number of weeks. [4] Control measures may include sanitizing pruning equipment between ...
Insects and plant diseases can weaken your orchid and cause it to drop buds and blooms prematurely. Mealybugs are the primary pest that feeds on orchids, Kondrat says.
Plant diseases are diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). [1] Organisms that cause infectious disease include fungi , oomycetes , bacteria , viruses , viroids , virus -like organisms, phytoplasmas , protozoa , nematodes and parasitic plants . [ 2 ]
If the leaves are dark green, the orchid isn’t getting enough light. A red tinge on the leaves means the plant is getting too much light. “Leaves should be yellow-green or olive green ...
In college during my introductory horticulture class, in which we had to nurse one of the easiest houseplants out there—a tiny, leafy-green pothos—it was wilted in record time, only slightly ...