Abstract
The environmental behavior of the pesticide azinphosmethyl was studied in a Michigan apple orchard watershed to gather data on initial distribution within the orchard and vertical movement of the pesticide under the influence of rainfall. Examination of residues reaching each layer showed the majority of the dislodgeable residues were distributed to the trees and grass-broadleaves. The litter-moss and soil contained residue levels roughly ten times lower than tree leaf residues. Analysis of residue data throughout the season indicated vertical pesticide movement among layers under both rainfall and no-rainfall conditions. The data were used to parameterize a model for azinphosmethyl attenuation and movement in an orchard ecosystem.
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