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DOWNY MILDEW OF BAJRA
ROOT KNOT OF MULBERRY
Root knot nematodes are distributed worldwide and cause economic damages to many crops. Causative agent: Meloidogyne incognita (Kofoid and White).
First reported by Narayanan et al 1966 on mulberry from india. It belongs to class- nematode order- tylenchida family- heteroderidae Common in sandy type of soils under irrigated conditions.Symptoms:
Affected plants show stunted growthMarginal necrosisYellowing of leavesFormation of characteristic knots/galls on the root
As a result of poor plant growth, about 10-12% leaf yield is lost in addition to affecting the leaf quality
CONTROL MEASURES: Deep digging/ ploughing Intercropping of nematicidal plants Use of organic oil cakes as soil amendments Application of nematicides Mutching of green leavesMineral deficiency diseases Nitrogen deficiency: slow and week growth of plant with less branching/vigor,
chlorosis and stunted root growth. Potassium deficiency: marginal scorching of leaves in younger stage, non juicy
and necrotic. Phosphorus deficiency: intra- veinal chlorosis of older leaves, marginal
necrosis and defoliation. Magnesium deficiency: chlorotic and necrotic spots on leaves. Calcium deficiency: defoliation of young leaves with necrosis along the veins. Sulphur deficiency: slight necrosis and stunted plant growth. Zinc deficiency: interveinal chlorosis& yellowish white spots on leaves.
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BY NANDHINI