downy mildew(bajra),root knot(mulberry)
Transcript of downy mildew(bajra),root knot(mulberry)
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