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Sooty mold develops on the honey dew (excreta) of sucking insects like- mealy bug, white flies etc.
Symptoms:
Symptoms consist of blackish brown velvety thin membranous covering on the leaves. In severe cases, the foliage appears black due to heavy infection. The affected leaves curl and shrivel under dry conditions.
Management:
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The control of disease consists in removing the cause by destroying the insects. The mold will die out for want of suitable growth medium if honeydew-secreting insects are killed by suitable insecticides.