Causal Agent:
Fungus (Plasmodiophora brassicae)
Characteristic Symptoms: | |
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Common symptoms are swelling and injury of roots and hypocotyl |
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The pathogen infects taproots and secondary roots |
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Roots of infected plants form galls which varies with plant age and root morphology and eventually result to root clubbing |
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Plants becomes yellow and stunted due to root clubbing and eventually wilt |
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Infected plants have fewer, smaller and blue-green leaves. |
Conditions for Disease Development | |
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The disease is favoured by high soil moisture, soil temperature at above 20° C and soil acidity |
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Contaminated transplants are the primary way of long -range spread
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The pathogen can survive dormant in soil for decades and can be spread by irrigation water, infested roots and wind-borne soil particles |
Management and Control: | |
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Use of resistant variety (if available)
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Use pathogen-free transplants. |
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Avoid acidic soil.
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Crop rotation with non-host crop for at least 3 years to reduce the amount of primary inoculum. |
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Increase soil pH to above 7.0 by lime application to reduce symptom severity or root clubbing. |
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Calcium and Boron application can also reduce root clubbing. |
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Avoid furrow irrigation. |
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