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Residues of carbaryl (Sevimol®) in ponderosa pine bark were quantified by gas chromatography and the major sources of experimental error were determined. Quantification of carbaryl residues was significantly affected by between-tree variation and disc size (bark volume). Variation between trees had the greatest effect on residue estimates. Mean carbaryl residues for all trees ranged from 241 μg/g of bark to 1418 μg/g of bark. Nonsignificant tree-disc size interactions indicated that residue levels were fairly consistent within trees. Prediction curves were constructed to project levels of precision for combinations of discs and trees.

INSECTICIDE RESIDUES ON PINE BARK: INFLUENCE OF TREES, SAMPLE VOLUME AND SIZE ON VARIABILITY1