MCPB

<p>MCPB, 2,4-MCPB, 4-(4-chloro-o-tolyloxy)butyric acid (<a href="/facts/IUPAC/2AV6myCK">IUPAC</a>), or 4-(4-chloro-2-methylphenoxy)butanoic acid (<a href="/facts/Chemical_Abstracts_Service/CVLrS5IJ">CAS</a>) is a phenoxybutyric herbicide.  In the <a href="/facts/United_States/P0sCdLe5">United States</a> it is registered for use on pea crops before flowering, for post-emergence control of broadleaf annual and perennial weeds including Canadian thistle, <a href="/facts/Buttercup/dLB7Fmo4">buttercup</a>, mustard, purslane, ragweed, common lambsquarters, pigweed, smartweed, sowthistle, and morning glory.  It has low to moderate acute <a href="/facts/Toxicity/qa96rs60">toxicity</a>, with kidney and liver effects as the main hazard concerns.  It is not volatile, persistent, or likely to bioconcentrate.
</p><p>A variety of methods have been developed for its analysis.  In the U.S., the maximum residue permitted on peas is 0.1 <a href="/facts/Parts_per_million/PozRuoLM">parts per million</a>.
</p>

MCPB open-in-new

MCPB