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New Pest Response Guidelines - aphis - US Department of Agriculture

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Identification<br />

Males are smaller and more slender than females with a wing span from 50-<br />

70mm. Bipectinated antennae with 58-64 segments are designed to detect the<br />

pheromone produced by the females (Melis, 1940).<br />

Figure 3-1 Images <strong>of</strong> male (left) and female (right) Dendrolimus pini (L), pinetree<br />

lappet (PTL) adults. © Serge Peslier<br />

Eggs<br />

<strong>New</strong>ly laid eggs are green or blue and will turn grey after a few days (Figure<br />

3-2 on page 3-3). Eggs are 2.6-2.8 mm long and 2 mm wide and chorion with<br />

grainy texture (Melis, 1940), laid in clusters <strong>of</strong> 50 to 100 on the tips <strong>of</strong><br />

branches.<br />

Figure 3-2 Pine-tree lappet eggs on pine needle. © Jeroen Voogd<br />

(www.ukmoths.org.uk)<br />

12/2012-01 Dendrolimus Pine Moths 3-3

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