New Pest Response Guidelines - aphis - US Department of Agriculture

Identification
Eggs
The eggs are found in rows on pine needles (Figure 3-6 on page 3-7), oval in
shape and range in color from rose to light brown (Ciesla, 2001) or palegreenish,
purplish or pale-yellow (CABI, 2011b).
Figure 3-6 Eggs of Dendrolimus punctatus, Masson pine moth, on pine needles
(William M. Ciesla, Forest Health Management International,
Bugwood.org)
Larvae
Larvae grow through 6 instars and are between 5.5 and 7 cm in length when
mature (Billings, 1991; Ciesla, 2001). The larvae have alternating patterns of
light grey and dark bands with orange markings in the black bands and
longitudinal bands along the body from head to the last abdominal segment
(CABI, 2011b). White setae are found on the lateral sides of the body. There
are urticating hairs on the thorax and abdomen of the larvae that can cause skin
and eye irritation as well as other health difficulties (Ciesla, 2001; Huang,
1991). Two color forms of the larvae have been noted: brownish-red and black
(CABI, 2011b). For a more detailed description, Matsumura (Matsumura,
1926a) provide the following:
Head reddish brown and concolorously pubescent; epicranial suture paler,
along which on each side is a fuscous stripe, scattering some fuscous spots
on the lateral borders, and some of them altogether building 2 or 3
longitudinal stripes; clypeus black; labrum very shallowly emarginated in
the middle; antennae brown. Cervical shield reddish brown, with 2
conspicuous dark stripes, which end anteriorly in some long black hair.
Body testaceous brown, marmorated with black; the hair clusters in the
second and third segments purplish dark brown, the interspace of which is
pubescent with long white hair; from the 3rd to the last segments covered
12/2012-01 Dendrolimus Pine Moths 3-7