Persistence of Aminocarb in Balsam Fir Foliage, Forest Litter, and Soil after Aerial Application of Three Formulations
- Sundaram, Kanth M. S.
Canadian Forestry Service
- Szeto, Sunny Y.
One water-based (180 FE) and two oil-based (180 FO and 180 D) aminocarb formulations were applied twice by a fixed-wing aircraft, each at 70 g of a.i./ha, to a coniferous forest near Bathurst, New Brunswick. The highest concentration of aminocarb in foliage was 2.76 ppm (fresh weight), detected 1 h after the second application of formulation 180 D. The residues decreased rapidly within 1 or 2 days after spray application but persisted at lower concentrations thereafter. Twenty-one days after the second spray application, the concentrations of aminocarb in foliage ranged from 0.14 to 0.64 ppm (fresh weight). Only low levels of residue were detected in forest litter and soil. The highest concentrations in litter and in soil were 0.216 ppm (fresh weight) and 0.044 ppm (fresh weight), respectively, detected 2 h after the second application of formulation 180 D. Residues in litter were higher and persisted longer than in soil. There was 0.013 ppm (fresh weight) present in litter 21 days after the second application of formulation 180 D but none were detected in soil after 8 days.
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