The information in this profile may be out-of-date. It was last revised in 1996. EXTOXNET no longer updates this information, but it may be useful as a reference or resource.

Please visit the National Pesticide Information Center (NPIC) to find updated pesticide fact sheets. If you don't find a fact sheet related to your question, feel free to call 1-800-858-7378. NPIC is open five days a week from 8:00am to 12:00pm Pacific Time.


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 June 1996


Trade and Other Names: Trade names include Dirimal, EL-119, Rycelan, Ryzelan, Ryzelon, and Surflan.

Regulatory Status: Oryzalin is a slightly to practically nontoxic compound in EPA toxicity class IV. Products containing oryzalin must bear the Signal Word CAUTION. It is a General Use Pesticide (GUP).

Chemical Class: Not Available

Introduction: Oryzalin is a selective pre-emergence surface-applied herbicide used for control of annual grasses and broadleaf weeds in fruit trees, nut trees, vineyards, established bermuda grass turf, and established ornamentals. It inhibits the growth of germinating weed seeds by blocking cell division in the meristems. It is available in aqueous suspension, dry flowable, and wettable powder formulations.

Formulation: It is available in aqueous suspension, dry flowable, and wettable powder formulations.

Toxicological Effects:

Ecological Effects:

Environmental Fate:

Physical Properties:

Exposure Guidelines:

Basic Manufacturer:

9330 Zionsville Road
Indianapolis, IN 46268-1054


References for the information in this PIP can be found in Reference List Number 10

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