Root-knot nematode, Meloidogyne incognita
Root knot nematode, Meloidogyne incognita is a obligate, sedentary endoparasites.
M. incognita is one of the major constraints in the production of tomato in tropical and subtropical regions. It causes 11 – 35% yield loss in tomato. Root knot remains a serious issue in both nursery and field conditions.
Mode of spread
Seedlings or planting materials, irrigation water and farm implements.
Symptoms
Above ground symptoms
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Infested seedlings may not survive after transplanting.
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Stunted growth of the plants.
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Disease appearance in patches under field conditions.
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Leaves show chlorosis and yellowing.
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Growth may be retarded.
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Plants show “Day wilting” symptom.
Below ground symptoms
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Primary galls are small and induced by swelling which coalesce to form larger secondary gall s/ knots on the root.
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Root system is reduced to a severely galled and a completely disorganized vascular system.
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Sometimes the galled tissues are invaded by secondary pathogens and results in root wilting.
Root knot galls on tomato |
