The 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 pph immediately following spraying even though wind speeds exceeded 2.2 m/s during much of the spray period.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.