Tamarack Pests
Tamarack Pests
Tamarack Pests
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Predicted impacts of winter low temperatures on Eastern larch<br />
beetle populations<br />
Larvae are extremely<br />
cold-tolerant –most<br />
survive winters.<br />
Low winter<br />
temperatures<br />
increased 0.25C /yr<br />
1964-2004.<br />
Adult survival has<br />
increased 0.7% /yr<br />
from 1964-2004.<br />
Greater overwintering<br />
success by ELB and<br />
may lead to increased<br />
tree mortality<br />
Minimum annual temperature (°C)<br />
-24<br />
-26<br />
-28<br />
-30<br />
-32<br />
-34<br />
-36<br />
-38<br />
-40<br />
-42<br />
-44<br />
-46<br />
0.0<br />
1960 1965 1970 1975 1980 1985 1990 1995 2000 2005<br />
Winter temperatures for Isle, MN<br />
Year<br />
Larval survival<br />
Adult survival<br />
just south of Mille Lacs Lake<br />
1.0 100%<br />
0.8 80%<br />
0.6 60%<br />
0.4 40%<br />
0.2 20%<br />
From -Proceedings Society of American foresters, 2008, Reno, Nevada<br />
In Press- Forrest Health Monitoring 2008, National Report 29<br />
8<br />
0<br />
%<br />
Proportionate survival (predicted)
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