Abstract
Dimethoate (Cygon®) residues were determined from foliage and twig samples of Canadian hemlock over a 14-week period following spray and soil drench treatments for control of the hemlock fiorinia scale, Fiorinia externa Ferris. Dimethoate was determined as phosphorus by the Sehöniger oxygen-flask combustion method, sensitive to 0.1 ppm. Pitch-like interfering substances were removed on a silicie acid column. Highest residues were obtained from sprayed plants where scale control was excellent. Much lower residues resulted from soil-treated plants which showed highest residues in the upper half of treated plants. No residues were found after 8 weeks following application of dimethoate.
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