The RHS is calling on gardeners to report sightings of the elusive giant willow aphid (Tuberolachnus salignus). Close to 6mm long with a distinctive shark-like fin, called a tubercle, on its back, it is one of our largest aphid species but little is known about where they spend most of the spring.
Dr Andrew Salisbury, RHS Principal Entomologist, says: “We are asking gardeners for their help tracking this aphid down. It isn’t certain where they go from April to June and their host range needs more investigation.”
Usually seen from July to February, with a peak in sightings in autumn, giant willow aphids are most likely to be found on willow, on the stems and branches of trees, but don’t cause any significant damage. They may retreat into the crevices…
