MCPA Amine, MCPA Ester, MCPA Sodium Salt: MCPA

Trade Names	Guaranteed active concentration	Ont. Sch.	Winter Storage	Manufacturer/ Registrant
MCPA Amine	500 g/L	3	A	Various manufacturers
MCPA Ester	500 g/L	1	B	Various manufacturers
MCPA Ester (Checkmate, IPCO, Nufarm)	600 g/L	2	B	Nufarm Agriculture Inc, Interprovincial Cooperative Ltd. United Agri Products
MCPA Sodium 300	300 g/L	3	A	Various manufacturers
MCPA Sodium 400	400 g/L	3	A	Nufarm Agriculture Inc,

Chemical Family	Phenoxy
Formulation	Sn
Group	4
Crop and/or Non-Crop Registrations	Cereal crops, turf, non-crop sites
Sensitive Weeds	Many broadleaf weeds, especially buttercup, hemp-nettle, field horsetail (top growth only), seedling dock.
Uptake and Translocation	Absorbed through leaves or roots. Translocates to, and accumulates at, growing points of shoots and roots.
Basis of Selectivity	Differences in interception, penetration, translocation, metabolism and sensitivity of active sites leads to greater activity in broadleaf weeds than grasses.
Application Methods	Post-emergence
Residual Activity	Some soil residues can be detected for up to 1 month under moist conditions and 2 months under drier conditions.
Unique Characteristics	MCPA is available in amine, ester or sodium salt formulations. It is safer than 2,4-D for use on oats, flax and peas. As with 2,4-D, there is a potential drift hazard to nearby susceptible crops such as grapes, turnips, tobacco and cabbage.