New Pest Response Guidelines - aphis - US Department of Agriculture

Identification
Figure 3-3 Pine-tree lappet eggs with larvae on Scot’s pine (Pinus sylvestris)
needles (Hannes Lemme, Bugwood.org)
Larvae
Seven to eight instars are observed during larval development. The last larval
instar is about 80 mm long and covered with soft red or gray hair. The thorax is
distinctively marked with a white band bordered by two blue bands and the
abdomen has characteristic V marks on the last two segments (Melis, 1940)
(Figure 3-4 on page 3-5). Head capsule measurements and larval weighs for
each instar are given in Table 3-1 on page 3-4 (Pszczolkowski and Smagghe,
1999).
Table 3-1 Head capsule width and body weighs of the PTL larval instars (means
± S.E)
Instar Head capsule width (mm) Body weight (mg)
I 1.27 ± 0.02 12.5 ± 0.1
II 1.63 ± 0.02 30.6 ±2.2
III 1.84 ± 0.04 54.1 ± 3.7
IV 2.22 ± 0.09 76.8 ± 4.2
V 2.94 ± 0.15 197.1 ± 18.5
VI 3.33 ± 0.16 583.8 ± 27.4
VII 5.01 ± 0.22 2542.3 ± 74.8
3-4 Dendrolimus Pine Moths 12/2012-01