Zectran Pilot Test to Control Spruce Budworm in Belmont and Chamberlain Creeks, Blackfood River Drainage, Montana
Problem Addressed: Spruce Budworm
Goal(s)/Objective(s): Determine the aerial transport of smoke within the spray areas, and optimum spray time.
Key Findings: Budworm population was reduced 47.8 ± 5.5 in Chamberlain Creek and 70.0 ± 4.2 in Belmont Creek.
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- McGregor, Mark D.
Forest Insect and Disease Branch - Dewey, Jerald E.
Forest Insect and Disease Branch
During 1968, a pilot test was conducted against the spruce budworm in Belmont and Chamberlain Creeks in the Blackfoot River drainage east of Missoula, Montana. Zectran, a nonpersistent carbamate insecticide, was applied at the rate of 1 ounce (6 percent by volume) in 1 pint of Dowanol (carrier), at a droplet size no larger than 120 microns in size per acre.
Spruce mortality was 70.0 ± 4.2 percent in the Burnt Fork of Belmont Creek, and 47.8 ± 5.5 percent in Chamberlain Creek.
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