Foliar residues of aminocarb at tree canopy and ground levels in an experimental spray operation in conifer forests

Foliar residues of aminocarb were measured at tree canopy and ground levels in conifer forests in New Brunswick, Canada, following aerial application of three spray mixtures of aminocarb, one water‐based, one in a volatile oil of low viscosity, and the third in a non‐volatile oil of high viscosity. For a given volume rate of application, all three mixtures provided similar foliar residues at tree canopy level, but the aqueous and the volatile‐oil based sprays provided significantly lower residues on cut foliage positioned at ground level, than the non‐volatile oil spray mixture.