Southern Research Station

Title: Fate of Picloram and Hexazione in a Cutover Northern Forest After Treatment with Herbicides for Site Preparation

Author: Neary, Daniel G.; Michael, Jerry L.; Lenz, Gary W.; Mroz, Glenn D.; Jurgensen, Martin F.

Date: 1984

Source: Bul. Ecol. Soc. Amer. 65(2): 191. Abstract.

Description: Two cutover northern hardwood stands in Baraga County, Michigan, were aerially sprayed with the herbicides hexazinone. picloram, and 2,4-D to eliminate hardwood stump sprouts prior to conversion to red pine (Pinus resinosa L.). Movement of two of these highly soluble herbicides (hexazinone and picloram) in an entic haplorthod sol1 was measured using tension lysimeters and streamflow sampling. Soil solution collected from a depth of 1 m prior to herbicide application dii not contain any residues. Two weeks after application residue concentrations were 77.9 and 26 µg/L for hexazmone and picioram, raspectively. Picloram residues in soil soMon declined in concentration and, three months after application, were not detectable. Hexazinone concentratiins peaked one month after application (101.9 µg/L) and then declined below detection limits by three months. Only trace levels (0.5 µg/L) of hexazinone and p4clofam were detected in an adjacent stream thrae days after herbicide application.

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Citation

Neary, Daniel G.; Michael, Jerry L.; Lenz, Gary W.; Mroz, Glenn D.; Jurgensen, Martin F.  1984.  Fate of Picloram and Hexazione in a Cutover Northern Forest After Treatment with Herbicides for Site Preparation.   Bul. Ecol. Soc. Amer. 65(2): 191. Abstract.