Notes on Saskatoon Berry Insects
Woolly elm aphid
Identification
The woolly elm aphid and its close relative the woolly apple aphid, are
bluish-white aphids with a white, waxy, wool-like coating. They feed on
the roots of saskatoon bushes, 2-10 cm below the soil surface. Infested
bushes lack vigour. Leaves turn yellow in late July-August and drop prematurely.
Severely affected bushes may fail to leaf out in the spring.
Period of activity
The aphids overwinter on elm trees and migrate to saskatoon bushes in
June and July. Aphid colonies are found on roots of saskatoon bushes in
July to October.
Management Notes
If practical, remove wild alternate hosts in the vicinity.
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