Skip to Main Content
Hexazinone Dissipation in Forest Ecosystems and Impacts on Aquatic CommunitiesAuthor(s): Jerry L. Michael; E. Cliff Webber; David R. Bayne; Joseph B. Fischer; Hilliard L. Gibbs; Wendy C. Seesock
Source: Can. J. For. Res. <b>29</b>: 1170-1181 (1999)
Publication Series: Miscellaneous Publication
PDF: View PDF (328 KB)
DescriptionHexazinone (active ingredient) was aerially applied as a pellet (Velpar ULW) and as a liquid (Velpar L) to watersheds in the Piedmont of Alabama, U.S.A., at the rate of 6.72 kg·ha-1 (three times the prescribed rate for this site). An untreated watershed served as a control. We determined hexazinone half-life in days for Velpar ULW (plants, 26-59; litter, 55; bare soil, 68; soil under litter, 74) and for Velpar L (plants, 19-36; litter, 56; bare soil, 77; soil under litter, 275). Maximum stream concentrations of hexazinone (422 µg·L-1 for Velpar ULW, 473 µg·L-1 for Velpar L) were observed during application and resulted from direct overspray. Hexazinone stream concentrations peaked several times during stormflow in the first 30 days (56-70 µg·L-1 for Velpar ULW, 145-230 µg·L-1 for Velpar L) and were diluted three to five times 1.6 km downstream. Hexazinone metabolites were also monitored. Exposure of macroinvertebrates to hexazinone did not alter benthic community structure. Taxa richness, including pollution-sensitive insects. did not differ significantly between either hexazinone treatment and the control. Benthic macroinvertebrates in Piedmont streams of the southeastern United States appear insensitive to hexazinone at the exposures observed in this study.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationMichael, Jerry L.; Webber, E. Cliff, Jr.; Bayne, David R.; Fischer, Joseph B.; Gibbs, Hilliard L.; Seesock, Wendy C. 1999. Hexazinone Dissipation in Forest Ecosystems and Impacts on Aquatic Communities. Can. J. For. Res. 29: 1170-1181 (1999)
- Hexazinone dissipation in forest ecosystems and impacts on aquatic communities
- Streamwater Contamination After Aerial Application of a Pelletized Herbicide
- Leaf litter breakdown of native and exotic tree species in two Hawaiian streams that differ in flow
XML: View XML