VIEW ARTICLE

Pressure Injection of Benomyl and Methyl-2-benzimidazolecarbamate hydrochloride for Control of Dutch Elm Disease. Neal K. Van Alfen, Assistant Plant Pathologist, Department of Plant Pathology and Botany, The Connecticut Agricultural Experiment Station, New Haven 06504; Gerald S. Walton, Associate Plant Pathologist, Department of Plant Pathology and Botany, The Connecticut Agricultural Experiment Station, New Haven 06504. Phytopathology 64:1231-1234. Accepted for publication 23 April 1974. DOI: 10.1094/Phyto-64-1231.

The effectiveness of benomyl (50% WP formulation) against Dutch elm disease was tested by pressure-injecting aqueous suspensions into trunks of large urban trees and small plantation trees. Trunk injection of benomyl was equally as effective as a spray program with methoxychlor for protecting large trees, but was totally ineffective on artificially inoculated small trees. Methyl-2-benzimidazolecarbamate hydrochloride very effectively protected the smaller trees against the disease. Bioassays showed that benomyl suspensions moved poorly through elm stems, and that only ca. 10% of the fungitoxicity could be detected after the suspension had passed through 20 cm of stem.