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New Pest Response Guidelines - aphis - US Department of Agriculture

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Identification<br />

Figure 3-9 Adult Siberian silk moth, Dendrolimus sibiricus, photographs<br />

showing dorsal view <strong>of</strong> female (top) and male (bottom)(<strong>Pest</strong> and<br />

Diseases Image Library, Bugwood.org).<br />

Eggs<br />

The eggs <strong>of</strong> SSM appear oblong and oval, measuring 2.2 X 1.9 mm, and having<br />

a light green coloration when first laid turning to a much darker coloration<br />

when mature (EPPO, 2005; Rozhkov, 1970). Eggs are laid in clusters on the<br />

surface <strong>of</strong> leaves or branches (Figure 3-10 on page 3-11). The chorion turns<br />

transparent two days before the larvae hatch (Liu and Shih, 1957).<br />

Figure 3-10 Siberian silk moth eggs in clusters (John H. Ghent, <strong>US</strong>DA Forest<br />

Service, Bugwood.org).<br />

12/2012-01 Dendrolimus Pine Moths 3-11

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