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Schizolachnus are small oval-bodied, hairy aphids. The body is usually covered with a dense coat of flocculent wax. The siphuncular cones are small and pale.
The Schizolachnus genus includes seven species (four nearctic and three palaearctic) all of which feed on pine (Pinus species) needles. They are found as small densely packed colonies along a needle. Despite the rather different appearance of the aphids, Schizolachnus is closely related to Eulachnus.
Schizolachnus obscurus (Waxy brown pine needle aphid)
Schizolachnus obscurus apterae are brown (cf. Schizolachnus pineti which are dark greyish-green or occasionally brownish). They are covered in greyish white wax which can make it difficult to determine the underlying colour. The fourth rostral segment (RIV) is 1.6-2.1 times the length of the fifth rostral segment (RV) (cf. Schizolachnus pineti in which RIV is 2.3-3.7 times the length of RV). RV has an extended tip and is 43-60 µm long (cf. Schizolachnus pineti in which RV is short and stumpy and is 33-43 µm long). The hind tibiae are dark and less densely hairy than in Schizolachnus pineti. The body length of adult Schizolachnus obscurus apterae is 1.9-2.7 mm.
The alate (see second picture above) is also brown and covered in dense grey wax meal.
The waxy brown pine needle aphid is mainly found on the needles of European black pine (Pinus nigra), but has also been found on pine species such as mountain pine (Pinus mugo) and stone pine (Pinus pinea) within Europe. Sexual forms have been found late in the year (October to December), but in mild winters parthenogenetic overwintering may occur. Schizolachnus obscurus is found in Europe east to Turkey and Georgia, and has been introduced to North America.
Schizolachnus pineti (Waxy grey pine needle aphid)
Schizolachnus pineti apterae (see first picture below) are dark greyish-green or occasionally brownish, and are covered in wax meal giving a light bluish-grey appearance (cf. Schizolachnus obscurus which is usually brown and wax-covered). The fourth rostral segment (RIV) is 2.3-3.7 times the length of the fifth rostral segment (RV) (cf. Schizolachnus obscurus in which RIV is 1.6-2.1 times the length of RV). RV is short and stumpy and is 33-43 μm long (cf . Schizolachnus obscurus in which RV has an extended tip and is 43-60 μm long). The hind tibiae are pale or dark and very densely hairy. The body length is 1.2-2.5 mm.
Schizolachnus pineti alate (see second picture above) is similarly covered in dense grey wax meal.
Schizolachnus pineti can be found on numerous species of Pines (Pinus species), but especially on young Scots pine (Pinus sylvestris) where it forms dense colonies in rows along the previous year's needles. Oviparae and alate males occur in October-December, but in years with mild winters colonies may persist through to the next year. Schizolachnus pineti is common and widespread in Europe and parts of Asia and introduced to North America.