Washington State University -- Impact 2004
The Science Behind RegulationsSUMMARY
- Research conducted at Washington State University's Puyallup Research and Extension Center provided the science behind rules implemented by the Washington State Department of Agriculture in 2002 regulating use of the clopyralid in Washington state.
ISSUE
- In 1999, WSDA investigators found symptoms of clopyralid damage in plants grown in compost from the Spokane Regional Solid Waste System. Similar symptoms were seen the following year in compost produced at Washington State University in Pullman. In 2001, samples from several composting facilities on the west side of the state confirmed that residues of the herbicide, which is used to control broadleaf weeds in lawns and cereal grains, the source of the problem. The herbicide, which breaks down slowly, was found in yard debris composts and manure-based products in Washington and other states at levels which could cause damage to susceptible plants.
WHAT HAS BEEN DONE
- WSU researchers launched a major effort to identify clopyralid problems, assess the potential for damage and keep compost users, the composting industry, and agency personnel informed of the latest information. Presentations were given groups in Washington and Oregon and a Web site was created and updated frequently to provide current information. Researchers conducted bioassays and a garden demonstration trial. Researchers also determined the persistence of clopyralid applied to lawns under local conditions.
IMPACT
- The Washington State Department of Agriculture implemented new rules in 2002 restricting clopyralid use. The rules were based in part on information developed by WSU. In June 2003 the WSDA reported that clopyralid levels in compost had dropped by 88 percent. More than 300 composters, decision makers, and compost users have been provided up-to-date information on clopyralid in compost. Compost operators are adopting new practices based on WSU workshops. Gardeners, farmers, landscapers, educators and composters have scientifically based information on clopyralid in compost. Because of restrictions on clopyralid use and increased awareness by the composting industry, no problems related to clopyralid in compost have been reported in 2002 or 2003.
PRIMARY AREA OF IMPACT
- Extension
Research
FUNDING:
- Dow Chemical Co.
Smith-Lever 3(b) &( c)
USDA
COUNTIES:
- The principal counties served are Multi-state
CONTACT:
- None