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S. oleae colonies extract large quantities of sap, causing general host debilitation and build-up of sticky honeydew deposits on nearby surfaces. The honeydew may attract attendant ants. Sooty moulds grow on the sugary deposits. Badly fouled leaves may be dropped prematurely. The older insects are usually quite easy to see as dark grey or brown-to-black lumps on leaf undersides and stems.
Planting material of host-plant species of S. oleae should be inspected in the growing season before shipment and should be free of infestation. A phytosanitary certificate should guarantee absence of the pest from consignments of either planting material or produce.
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:
S. oleae is one of the most important pests of citrus in the Mediterranean Basin, Florida, California and South America (Bartlett, 1978). Gill (1988) considered it to be the most injurious soft scale in California, and the most important pest of citrus there until 1940; he also reports it as a serious pest of olives. Removal of large quantities of sap debilitate the plant and can cause wilting, desiccation of tissues and dieback. Sooty mould growth on honeydew deposits screen light and air from the leaves and impair photosynthesis, promoting premature leaf drop. Such damage reduces overall yield and quality of produce.