Northern Research Station

Title: Helicopter Propwash Dislodges Few Spruce Budworms

Author: Jennings, Daniel T.; Houseweart, Mark W.

Date: 1986

Source: Res. Note NE-333. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 7 p.

Station ID: RN-NE-333

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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Citation

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..