New Pest Response Guidelines - aphis - US Department of Agriculture
New Pest Response Guidelines - aphis - US Department of Agriculture
New Pest Response Guidelines - aphis - US Department of Agriculture
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Damage<br />
<strong>Pest</strong> Information<br />
The main damage is caused by the larva feeding on the needles <strong>of</strong> pine tree<br />
hosts causing extensive defoliation. Completely defoliated trees will normally<br />
die if the outbreaks last a few years. The severity <strong>of</strong> the damage in a forest is<br />
determined by the factors affecting the intensity <strong>of</strong> an outbreak (see Population<br />
Dynamics above). When larvae densities reach outbreak levels, complete forest<br />
stands can be affected causing tree death in a period <strong>of</strong> 2 to 3 years and<br />
covering millions <strong>of</strong> ha <strong>of</strong> forested areas (Figure 2-7 on page 2-37). Trees that<br />
survive a period <strong>of</strong> outbreak are weak and more vulnerable to the attack <strong>of</strong><br />
secondary pests including wood borers in the families Cerambycidae and<br />
Scolytidae (EPPO, 2005; Orlinskii, 2000).<br />
Figure 2-7 Defoliated larch trees by Dendrolimus sibiricus in Mongolia (Vladimir<br />
Petko, V.N. Sukachev Institute <strong>of</strong> Forest SB RAS, Bugwood.org).<br />
12/2012-01 Dendrolimus Pine Moths 2-37
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