White-winged flies 1-2mm long can be seen on the underside of
leaves in mid-summer. The overwintering flies in pupal stage appear
as raised, oval, black objects encrusted with a white wax
substance.
Spot them
They are 1mm long and can be seen on the lower leaf surface.The
yellow-green scale-like nymphs suck sap from the leaves in mid-late
summer.
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