An experiment was conducted during the fall of 1983, in a conifer plantation near Thessalon, Ontario, to assess the downwind deposits and airborne concentrations of permethrin [3‐phenoxybenzyl (±) cis‐, trans‐ 3‐(2,2‐dichloroviny1)‐2,2‐dimethylcyclopropanecar‐boxylate], following application as an emulsion formulation, over a single 100 m spray line at 35 g AI (active ingredient)/ha. The insecticide was collected up to 150 m downwind by using various static collectors and air samplers. Simultaneous measurements of droplet deposition on Kromekote® cards permitted calculation of droplets/cm2 and size spectra. The data indicated that permethrin deposits on all static collectors were greatest within 30 m of the spray swath. Deposits per unit area of the collectors, droplets/cm2 of the sampling cards and airborne concentrations all decreased exponentially with increasing downwind distance. Beyond 30 m downwind, the amounts of the insecticide trapped by various collectors were extremely low, and were barely detectable.
No takes yet. Share an insight, caveat, or question.
Sundaram et al. (1987) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: