The B.C. forests ministry has produced a map of thousands of trees that the public and loggers are urged to avoid due to arsenic residue from the application of a pine-beetle pesticide no longer used in Canada.
Monosodium methanearsenate, or MSMA, was widely used in B.C.'s northern and Interior regions from the mid-1980s until 2004 with assurances at the time that the pesticide, sold under the trade name Glowon, posed little threat to the environment or to human health.
By 2005, MSMA was no longer in use in Canada after the manufacturer allowed its permit to expire.