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SymptomsWhite wooly wax appears on the twigs of the alder from late May onwards. This pest may stunt growth, but is seldom so troublesome.
Spot themSap-feeding insects 2-3 mm long. Nymphs have wide, flat bodies, large eyes and wing buds. Adults have two pairs of wings and can jump and fly.
Discuss Alder sucker with other Shoot members.