- The affected parts turn yellow, curled, wrinkled and deformed in shape and ultimately dry and die away.
- Large colonies of nymphs and adults are found on tender twigs and shoots as also on ventral leaf surface sucking the vital sap from the tissues.
- Fruit size and quality are also reduced.
- The aphids also exude copious quantity of honeydew on which sooty mould develops, in turn, hinder the photosynthetic activity of the vines, resulting in stunted growth.
- The fruits covered by sooty mold look unattractive and lose their market value.
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