Spraying of Big Sagebrush With 2,4-D Causes Negligible Stream Contamination
CitationSchroeder, M. H., & Sturges, D. L. (1980). Spraying of big sagebrush with 2, 4-D causes negligible stream contamination. Journal of Range Management, 33(4), 311-312.
PublisherSociety for Range Management
JournalJournal of Range Management
AbstractThe maximum level of 2,4-D detected in stream water was 5 ppb following aerial application of 2.2 kg/ha herbicide to a 238-ha watershed for big sagebrush control. Careful placement of the aerially applied herbicide, leaving an unsprayed buffer strip 30 m wide bordering the stream channel, and the presence of a snowdrift over the channel, prevented significant water contamination. Surface snow within the unsprayed buffer zone averaged 35 ppb of 2,4-D. Herbicide levels in a stream .5 km downwind from the sprayed watershed did not exceed 2 ppb immediately following spraying even though wind speeds exceeded 2.2 m/s during much of the spray period.