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Filtering by: Subject Douglas fir -- Diseases and pests -- Control -- Bitterroot National Forest (Idaho and Mont.) Creator Dewey, Jerald E.

Ground application of dimethoate (Cygon) for the control of cone and seed destroying insects of Douglas-fir and grand fir

Creator:

Dewey, Jerald E., United States. Forest Service. Northern Region. Forest Environmental Protection, and United States. Forest Service. Northern Region. State & Private Forestry

Abstract:

Two concentrations of dimethoate were applied with a hydraulic ground sprayer to cone-bearing Douglas-fir and grand fir trees. Single application (mid-June) and a double application (mid-June and mid-July) were compared. Three of the four treatments applied to Douglas-fir resulted in a significantly higher number of sound seeds produced per cone...

Resource Type:

Technical Report

Full Text:

depredations. Study sites were on the Selway District, Nezperce National Forest, Idaho. METHODS AND MATERIALS