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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 ...
An appressorium is formed and a penetration peg penetrates the leaf surface. [1] From there, hyphae grow throughout the leaf and infects all plant tissues. [1] While this pathogen enters through the leaf, the disease is caused by root rot that causes symptoms of foliar blight. The mycelium gives rise to chlamydospores and oospores. [1]
Orchid fleck dichorhavirus, commonly called Orchid fleck virus (OFV), is a non-enveloped, segmented, single-stranded (ss) RNA negative-strand virus, transmitted by the false spider mite, Brevipalpus californicus. OFV causes necrotic and chlorotic lesions on the leaves [1] of many genera in the family Orchidaceae.
Plant disease triangle. Epidemiology is the study of factors affecting the outbreak and spread of infectious diseases. [10] A disease triangle describes the basic factors required for plant diseases. These are the host plant, the pathogen, and the environment. Any one of these can be modified to control a disease. [11]
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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]
About 30,000 cases of Lyme disease in the U.S. are reported to the Centers for Disease Control and Prevention by state and local health departments each year. However, the CDC says that many more ...
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