Betulaphis quadrituberculata apterae are pale yellowish green but sometimes almost white. In autumn they may have patches of darker pigment. The antennae are shorter than the body. The sexual forms (oviparae) which develop in late autumn are dark brown in colour and rather unusual in shape because the posterior abdominal segment behind the siphunculi appear as an elongate ovipositor-like structure.

It is best to get expert confirmation of species identification before submitting a record.

Usually found on the undersides of Downy Birch leaves, but may also use Silver Birch and very occasionally Grey Alder.

Spring to late autumn.

Betulaphis quadrituberculata overwinters in the egg stage on birch trees. The eggs hatch in spring and the young nymphs feed on the underside of the leaves.

True status in Britain is difficult to establish due to lack of records.

Rarely recorded in Leicestershire and Rutland.

https://influentialpoints.com/Gallery/Betulaphis_quadrituberculata_Small_downy_birch_aphid.htm