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Sap sucking and excretion of honey-dew producing sooty moulds and attracting ants.
Chemical control is possible indirectly by controlling ants by banding the tree stump. This keeps the attending ants away and allows natural enemies to clean up the infestation. The band should be at least 15 cm wide and care taken to avoid leaving any bridges.
Natural enemies include predators such as ladybirds (Chilocorus), caterpillars (Noctuidae: Eublemma), parasites (Aphelinidae: Coccophagus, some Encyrtidae and Eulophidae). The parasitic fungus Cephalosporium lecanii is particularly effective in the rainy season when it can kill large colonies of the green coffee scale in a short period of time.
Although usually minor, can be extremely devastating depending on place and crop.