New Pest Response Guidelines - aphis - US Department of Agriculture

Identification
Larvae
Final instar larvae of the SSM are on average smaller (50-80mm) than SaSM
larvae (60-82mm) (EPPO, 2005; Rozhkov, 1970). For both species, the larvae
are hairy, with distinctive blue bands of hairs behind the 1st and 2nd thoracic
segment (Figure 3-11 on page 3-12). A description of the SSM larvae
according to Matsumura, 1926b follows:
Larva dark brown; head reddish brown, opaque, at the occiput with two
obsolete short fuscous stripes; clypeus in the middle with a fuscous spot;
labrum shining, in the middle shallowly incised. Abdomen yellow, with
numerous minute fuscous spots, shield plate of the first segment reddish
brown, on its sides marmorated with red, 2 nd and 3 rd segment dorsally
covered with silvery scales, 4 th to 12 th segments each dorsally with 2
large silvery scaly spots and a diamond marking, the latter being larger at
6 th to 8 th segment. Stigma yellowish, with black periphery. Thoracic legs
except the bases black, abdominal legs yellowish, each on the outer side
with a broad fuscous stripe, that of the spurial leg with 2 whitish stripes
in it. Venter with a series of fuscous spots, which becoming smaller
towards both ends (Matsumura, 1926b).
Figure 3-11 Siberian silk moth larva (Yuri Baranchikov, Institute of Forest SB
RASC, Bugwood.org).
3-12 Dendrolimus Pine Moths 12/2012-01