Helicopter Propwash Dislodges Few Spruce Budworms

Daniel T. Jennings; Mark W. Houseweart; Mark W. Houseweart

doi:10.2737/NE-RN-333

Treesearch

Helicopter Propwash Dislodges Few Spruce Budworms

Informally Refereed

Authors:

Daniel T. Jennings, Mark W. Houseweart, Mark W. Houseweart

Year:

1986

Type:

Research Note

Station:

Northern Research Station

DOI:

https://doi.org/10.2737/NE-RN-333

Source:

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

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Download (PDF 414 KB): https://research.fs.usda.gov/download/treesearch/21601.pdf

Abstract

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.

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.