Accession Number:

AD0739608

Title:

Feasibility Study of a Dry-Liquid Insecticide Employed in a Coniferous Forested Environment.

Descriptive Note:

Technical note,

Corporate Author:

DESERET TEST CENTER FORT DOUGLAS UTAH

Personal Author(s):

Report Date:

1972-03-01

Pagination or Media Count:

75.0

Abstract:

The U.S. Forest Service and Deseret Test Center DTC conducted a test in the Nezperce National Forest, Idaho June 1971. This test demonstrated the feasibility of controlling the spruce budworm by disseminating a dry-liquid insecticide from an aircraft. The test also showed that a diurnal drainage wind is an effective transporter of small aerosolized particulates when released below the inversion layer. The rotorod sampler was effective in collecting the dry-liquid particulate of Zectran and defining the area covered. The predicted below-canopy dosage generally exceeded observed values, suggesting the need for additional information about the below-canopy environment. It is hypothesized that the low budworm mortality resulted from a low impaction efficiency of the small particles and insufficient amount of Zectran being released over the target. To achieve a 90-percent mortality rate, an estimated 10,700 to 34,700 particles in the 3.5-micron size range would be required, compared with only 3 to 10 particles in the 35-micron range. Author

Subject Categories:

  • Forestry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE