Bole Implantation of Systemic Insecticides Does Not Protect Trees From Spruce Beetle Attack
Authors: Shea, Patrick J.; Holsten, Edward H.; Hard, John
Source: Western Journal of Applied Forestry, Volume 6, Number 1, 1 January 1991 , pp. 4-7(4)
Publisher: Society of American Foresters
Abstract:Two experiments were conducted on the Kenai Peninsula, Alaska, to evaluate the effectiveness of acephate, dimethoate, and carbofuran delivered by Medicap implants in previously unattacked spruce trees [natural hybrids of Sitka (Picea sitchensis) and white spruce (P. glauca)] to prevent tree mortality (preventive treatment); and in successfully attacked spruce trees to kill brood of spruce beetle, Dendroctonus rufipennis, and thereby prevent tree mortality (remedial treatment). Tree mortality ranged from 60% to 93% in the treated trees and were judged as inadequate in preventing tree mortality. There was no evidence of egg, larval, pupae, or adult beetle mortality. Residue analysis of foliages removed from the crown of sample trees ranged from ca. 5 ppm 28-days postspray to ca 23 ppm 128 days postspray showing that acephate moved vertically into the tree crown. Neither carbofuran nor dimethoate were recovered from foliage samples. West. J. Appl. For. 6(1):4-7.
Document Type: Journal Article
Affiliations: Pacific Northwest Forest and Range Experiment Station, 201 E. 9th Avenue, Anchorage, AK 99501
Publication date: January 1, 1991
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