• McGregor, Mark D
  Forest Insect and Disease Branch, USDA
  
• Dewey, Jerald E.
  Forest Insect and Disease Branch, USDA
  

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 a 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.