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100 Years of Achievements in
Insect Control

A History in Pictures from USDA


 
After the beetle outbreak, the same area looked like this. June 15, 1939 was the date of the big blowdown. Winds reaching a velocity of 70 miles an hour swept across the forests of Colorado and in their wake lay thousands of toppled Engelmann spruce trees. These conditions were ideal for the Engelmann spruce beetle, a native of Colorado forests, to reproduce in tremendous numbers. First they attacked the bark of the toppled trees; later, they spread to the standing trees, destroying more than 4 billion board feet of timber before the outbreak was brought under control.

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