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Willow Bark Aphid



P_wlwbkaphid

Willow Bark Aphid

Usually appear in

Spring to Autumn.


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Caused By:-     The Aphid Tuberolachnus salignus

Description

The willow Bark Aphid Tuberolachnus salignus is a very large aphid with black spots on its abdomen and three thorn-like projection on the back end of the abdomen. They are also called the Giant Bark Aphid and the Large or Giant Willow Aphid.
They are up to 5mm long and with their splayed out legs they look even larger.
They are grayish-black, and found in large colonies on the bark of 1-3 year old stems of deciduous trees, preferably willow, in the late summer.
Although they are present throughout the growing season they are usually not noticed until they are large colonies and they start to wander or fall off the tree. The females have two forms: winged and wingless, but there does not seem to be any males. They overwinter as adults and are active over the winter in January and February.
Bark aphids feed on sap from the cambium layer of the twigs and heavy infestations may result in stunting or twig dieback.
Picture by Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org.
See also these other aphids Aphids, Blackfly, Cypress, Green Spruce, Honeysuckle, Juniper, Lettuce Root, Lupins, Mealy Cabbage, Mealy Plum, Melon Cotton, Peach, Rose, Rosy Apple, Wooly.


Control

Spraying with insecticides before the aphids become heavily established is much more effective.
Insecticidal soap or horticultural oil.
Hosing off with a strong jet of water will work, but they do travel quite a distance using their legs and can move very fast for an aphid.
A winter tar wash will also be beneficial.
Although healthy trees often sustain very large populations without any observable affects, most aphids can transmit viruses and other diseases.



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