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E X T O X N E T

Extension Toxicology Network

Pesticide Information Profiles

A Pesticide Information Project of Cooperative Extension Offices of Cornell University, Oregon State University, the University of Idaho, and the University of California at Davis and the Institute for Environmental Toxicology, Michigan State University. Major support and funding was provided by the USDA/Extension Service/National Agricultural Pesticide Impact Assessment Program.

EXTOXNET primary files maintained and archived at Oregon State University

Revised 9/95.

MECOPROP

TRADE OR OTHER NAMES: Mecoprop is commonly called MCPP. Trade names include Kilprop, Mecopar,Triester-II, Mecomin-D, Triamine-II (with MCPA and 2.4-DP), Triplet (with 2,4-D and dicamba), TriPower (with MCPA and dicamba), Trimec (with 2,4-D and dicamba), Trimec-Encore (with MCPA and dicamba), and U46 KV Fluid (41, 43).

REGULATORY STATUS: Mecoprop is a general use pesticide (GUP).

INTRODUCTION: Mecoprop is a selective, hormone-type phenoxy herbicide. It is applied postemergence and is used on ornamentals and sports turf, for forest site preparation, and on drainage ditch banks for selective control of surface creeping broadleaf weeds such as clovers, chickweed, lambsquarters, ivy, plantain and others. It is also used on wheat, barley, and oats (41, 43). Mecoprop is absorbed by plant leaves and translocated to the roots. It affects enzyme activity and plant growth (6). It acts relatively slowly requiring three to four weeks for control (43). The U.S. EPA has classified mecoprop as toxicity class III- slightly toxic. Products containing mecoprop bear the Signal Word "Caution" (41). It is available as a liquid concentrate, granules, and is sprayed on fertilizer pellets to produce weed and feed products (45).

TOXICOLOGICAL EFFECTS

ECOLOGICAL EFFECTS

ENVIRONMENTAL FATE

PHYSICAL PROPERTIES AND GUIDELINES

It exists as a mixture of two optically active isomers of which one, the R+ form, mecoprop-p is herbicidally active (6). It is stable to heat, hydrolysis, reduction, and oxidation. It is acidic. Solutions of the salts of mecoprop are stable for several years under normal storage conditions. In cooler temperatures, the salt may crystallize out of solution but will re-dissolve on warming (41, 45).

Physical Properties: Properties are of the acid form unless otherwise noted.

Exposure Guidelines: Guidelines are for the acid form unless otherwise noted.

BASIC MANUFACTURER:

PBI/Gordon
P.O. Box 4090
1217 W. 12th Street
Kansas City, MO 64101

REFERENCES

References for the information in this PIP can be found in Reference List Number 7

DISCLAIMER: The information in this profile does not in any way replace or supersede the information on the pesticide product label/ing or other regulatory requirements. Please refer to the pesticide product label/ing.