Causal Agent:
Fungus (Phoma terristris)
| Characteristic Symptoms: | |
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Roots of affected plants become pink and brittle and eventually rot.
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Necks of infected plants are soft and empty. |
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Severe infections result to reduced bulb size. |
| Conditions for Disease Development: | |
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Once a field becomes infested, the fungus remains in the soil ( as deep as 45cm ) for many years as chlamydospores, pycnidia or pycnidiospores or in plant debris. |
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Optimum soil temperature for disease development is 24-28º C. |
| Management and Control: | |
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Use pathogen-free seeds.
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Soil fumigation/steaming/solarization and long crop rotation have been shown effective in reducing pink root.
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Proper fertilization and irrigation can help prevent the spread of the disease.
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