Detailed Explanation of Control Methods for Cymbidium Mosaic Virus in Chinese Cymbidium
If you notice initial faded spots on your Chinese cymbidium that later spread along the leaf veins, with adjacent lesions merging to form elongated faded patches, it is very likely that your Chinese cymbidium has contracted mosaic virus. So how should Chinese cymbidium mosaic virus be controlled?
Chinese Cymbidium
Control of orchid viruses should focus on prevention.
1. Destroy diseased plants immediately upon discovery. If they are rare varieties, they should also be isolated and given enhanced management.
2. When propagating by division, fingers and tools should be washed with soapy water. Do not wash many plants in the same bucket of water; instead, wash each plant one by one under running water. Potting soil, moss, pots, and other items should also be disinfected beforehand before use.
Currently internationally recognized effective disinfectants include: (1) 2% formalin and 2% sodium hydroxide aqueous solution (cannot be reused once it turns green); (2) 164 grams of anhydrous trisodium phosphate (NaPO4) or 377 grams of trisodium phosphate containing water of crystallization, added to 1000 mL of water, which can be used to disinfect tools, cultivation environments, etc.
3. When using diseased plants as female parents for pollination, fully mature seeds should be used for sowing.
4. Plants outside the Orchidaceae family, such as those in the Solanaceae, Fabaceae, and Chenopodiaceae families, may also carry the virus and become infected, so attention should be paid to this in control efforts.
Control Methods for Cymbidium Mosaic Virus in Chinese Cymbidium
Symptoms
Initial faded spots that later spread along the leaf veins, with adjacent lesions merging to form elongated faded patches, presenting as mosaic disease. After the leaves mature, the faded stripe lesions become necrotic.
Pathogen
Cymbidium mosaic virus (CyMV), which occurs worldwide. The virus particles are approximately 480 nm long and approximately 13 nm wide, and the virus is easily transmitted mechanically through sap. This virus naturally infects as many as 38 genera of orchids, making it the virus with the widest host range among orchids.
Transmission routes: During division and transplanting, fingers and tools such as scissors that have come into contact with infected plants carry the virus and can transmit it to healthy plants they touch. The roots of diseased plants are easily damaged, and the virus can flow out from the bottom of the pot during watering, making it infectious.
Control Methods
Control of orchid viruses should focus on prevention.
1. Destroy diseased plants immediately upon discovery. If they are rare varieties, they should also be isolated and given enhanced management.
2. When propagating by division, fingers and tools should be washed with soapy water. Do not wash many plants in the same bucket of water; instead, wash each plant one by one under running water. Potting soil, moss, pots, and other items should also be disinfected beforehand before use.
Currently internationally recognized effective disinfectants include: (1) 2% formalin and 2% sodium hydroxide aqueous solution (cannot be reused once it turns green); (2) 164 grams of anhydrous trisodium phosphate (NaPO4) or 377 grams of trisodium phosphate containing water of crystallization, added to 1000 mL of water, which can be used to disinfect tools, cultivation environments, etc.
3. When using diseased plants as female parents for pollination, fully mature seeds should be used for sowing.
4. Plants outside the Orchidaceae family, such as those in the Solanaceae, Fabaceae, and Chenopodiaceae families, may also carry the virus and become infected, so attention should be paid to this in control efforts.
Diagnostic Methods
(1) The faded spots or elongated faded spots produced on leaves present as mosaic patterns, which later become necrotic and form dark brown lesions.
(2) Observation under an electron microscope shows virus particles approximately 480 nm long, which can basically lead to a diagnosis of CyMV.
(3) Diagnosis using a CyMV antiserum test.
(4) Diagnosis can be made by inoculating indicator plants such as Chenopodiaceae plant C. amaranticolor, New Zealand spinach, Datura stramonium, Cassia occidentalis, and observing the reaction.
How to Control Cymbidium Mosaic Virus in Chinese Cymbidium
China Landscape Web, February 28 news: Symptoms
Initial faded spots that later spread along the leaf veins, with adjacent lesions merging to form elongated faded patches, presenting as mosaic disease. After the leaves mature, the faded stripe lesions become necrotic.
Pathogen
Cymbidium mosaic virus (CyMV), which occurs worldwide. The virus particles are approximately 480 nm long and approximately 13 nm wide, and the virus is easily transmitted mechanically through sap. This virus naturally infects as many as 38 genera of orchids, making it the virus with the widest host range among orchids.
Transmission routes: During division and transplanting, fingers and tools such as scissors that have come into contact with infected plants carry the virus and can transmit it to healthy plants they touch. The roots of diseased plants are easily damaged, and the virus can flow out from the bottom of the pot during watering, making it infectious.
Control Methods
Control of orchid viruses should focus on prevention.
1. Destroy diseased plants immediately upon discovery. If they are rare varieties, they should also be isolated and given enhanced management.
2. When propagating by division, fingers and tools should be washed with soapy water. Do not wash many plants in the same bucket of water; instead, wash each plant one by one under running water. Potting soil, moss, pots, and other items should also be disinfected beforehand before use.
Currently internationally recognized effective disinfectants include: (1) 2% formalin and 2% sodium hydroxide aqueous solution (cannot be reused once it turns green); (2) 164 grams of anhydrous trisodium phosphate (NaPO4) or 377 grams of trisodium phosphate containing water of crystallization, added to 1000 mL of water, which can be used to disinfect tools, cultivation environments, etc.
3. When using diseased plants as female parents for pollination, fully mature seeds should be used for sowing.
4. Plants outside the Orchidaceae family, such as those in the Solanaceae, Fabaceae, and Chenopodiaceae families, may also carry the virus and become infected, so attention should be paid to this in control efforts.
Diagnostic Methods
(1) The faded spots or elongated faded spots produced on leaves present as mosaic patterns, which later become necrotic and form dark brown lesions.
(2) Observation under an electron microscope shows virus particles approximately 480 nm long, which can basically lead to a diagnosis of CyMV.
(3) Diagnosis using a CyMV antiserum test.
(4) Diagnosis can be made by inoculating indicator plants such as Chenopodiaceae plant C. amaranticolor, New Zealand spinach, Datura stramonium, Cassia occidentalis, and observing the reaction.