The Giant Willow Aphid was discovered in New Zealand in 2013. When it was then looked for it was found to be widespread and has probably been in New Zealand for 20 years.
It forms large dense groups on willows and poplars and sucks the sap from young s
The Giant Willow Aphid is one of the largest aphid species (up to 6 mm). It is brown with a pattern of spots including three prominent ones on the back of its abdomen. When squashed the aphids ooze a red blood-like liquid.
In high numbers during summer months the honeydew the aphids produce can fall like fine rain from affected trees. Wasps are often attracted to the sweet honeydew and where the honeydew coats leaves and stems sooty mould will start to grow.
Trees up to 4 m:
Trees over 4 m:
*It has been found to be effective on some trees up to 20 m.
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