Froggatt's apple leafhopper honeydew and sooty mould on shoots, stems or leaves

 Leaf feeding by Froggatt's apple leafhopper causes yellowing (chlorosis) of the upper surface which is easily seen. The damage begins typically in the centre and lower parts of the apple tree and spread upwards and outwards in the tree as the season progresses. Damage is accompanied by honeydew which is excreted by the leafhoppers. This provides a substrate for the growth of sooty mould. Honeydew and sooty mould may occur on both leaves and fruits when leafhopper populations are high.
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