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Title: Helicopter Propwash Dislodges Few Spruce Budworms
Author: Jennings, Daniel T.; Houseweart, Mark W.; Houseweart, Mark W.
Source: Res. Note NE-333. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 7 p.
Description: Propwash treatments from a low-flying Bell 47-G2 helicopter dislodged few spruce budworm larvae and pupae from host balsam-fir trees. After propwash treatments, both larval-pupal densities on branch samples and in drop-tray collections near the ground were not significantly different between treated and control plots. Significantly more larvae were found in the lower crowns of treated trees, possibly indicating a downward shift in the larval population due to treatment. Residual parasitized larvae was 15.9 percent on treated trees and 14.6 percent on control trees.
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Jennings, Daniel T.; Houseweart, Mark W. 1986. Helicopter Propwash Dislodges Few Spruce Budworms. Res. Note NE-333. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 7 p.
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