The US Composting Council calls on chemical manufacturers to
withdraw herbicides known to persist in soil and compost with phytotoxic
plant effects and to take responsibility for the damage these
persistent herbicides cause, and on the US EPA and state agencies to
take immediate and decisive action to prevent further environmental and
What Are Persistent Herbicides?
Persistent herbicides are a class of systemic herbicides that are used
to control a wide variety of broadleaf weeds. These herbicides are
formulated to survive multiple years of exposure in a growing
environment. This relatively new class of herbicides called “pyridine
and pyrimidine carboxylic acids” has been designed for use in hayfields,
horse pastures, agricultural crop production, golf courses, right-of-
ways, and lawns to kill off unwanted weeds and to remain effective for
several months to years. These herbicides do not impact grasses, but
once ingested, can pass through mammals into their manure, urine or
bedding chemically intact.
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USCC Position Statement on Persistent Herbicides