About: Black rot on orchids

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Black rot on orchids is caused by Pythium and Phytophthora species. Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. Pythium ultimum is a pathogen that causes damping-off and root rot on plants. Symptoms of this pathogen include stunting and chlorosis. Identifying Pythium ultimum has traditionally been done by examining oogonia, antheridia, and sporangium structure. Now, PCR (polymerase chain reaction) technology can identify the pathogen using DNA fragments.

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  • Black rot on orchids is caused by Pythium and Phytophthora species. Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. Pythium ultimum is a pathogen that causes damping-off and root rot on plants. Symptoms of this pathogen include stunting and chlorosis. Identifying Pythium ultimum has traditionally been done by examining oogonia, antheridia, and sporangium structure. Now, PCR (polymerase chain reaction) technology can identify the pathogen using DNA fragments. Phytophthora cactorum is a pathogen that causes root rot on many plant species. Symptoms of this pathogen include necrosis in the roots, chlorosis, and wilting. Phytophthora cactorum can be identified by examining oogonia, antheridium, oospore, and sporangia structure. (en)
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  • Black rot on orchids is caused by Pythium and Phytophthora species. Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. Pythium ultimum is a pathogen that causes damping-off and root rot on plants. Symptoms of this pathogen include stunting and chlorosis. Identifying Pythium ultimum has traditionally been done by examining oogonia, antheridia, and sporangium structure. Now, PCR (polymerase chain reaction) technology can identify the pathogen using DNA fragments. (en)
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  • Black rot on orchids (en)
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