(Olympia, WA)  --  Washington State Department of Ecology officials say the agency and a growers association have cancelled plans to use a controversial pesticide on oyster beds.  Outcry from environmentalists, restaurateurs, and the public has prompted officials to abort plans to use the neurotoxic pesticide in Willapa [[ WILL-uh-puh ]] Bay and Grays Harbor, two areas that account for a quarter of the commercial oysters produced in the U.S.  The "Seattle Times" reports Taylor Shellfish, Washington's largest shellfish producer, won't move forward with its plan to use the toxin to combat the burrowing shrimp, which destabilize tideflats and cause oysters to sink and suffocate.