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On this Page
  • Recent Reports and Announcements
  • Risk Evaluation and Mitigation Documents
  • Historic Documents

Information on Methomyl

See all Active Ingredients

Find information on the registration status, continuous evaluation and mitigation measures in California to regulate this active ingredient. An active ingredient is the chemical that makes a pesticide work on a target pest.

Active Ingredient: Methomyl
Type of Pesticide: Insecticide
California Registration: Yes
Products Registered
EPA Registration: Yes
Fumigant: No
California Restricted Material: Yes
Toxic Air Contaminant (TAC): No
Volatile Organic Compound (VOC): No
Potential Groundwater Contaminant: Yes
Reevaluation Status: None
Chemical Class: Carbamate
DPR Chemical Code: 383

Recent Reports and Announcements

  • Potential for Methomyl Movement to California Groundwater as a Result of Agricultural Use

Risk Evaluation and Mitigation Documents

  • November 2015 - Methomyl Draft Risk Characterization Document - English pdf  

Historic Documents

  • February 2009 – Report on Air Monitoring the Application of Methomyl in Fresno County in October 2007
  • February 2009 – Appendix A: Site Photographs
  • February 2009 – Appendix B: Protocol for the Application Air Monitoring of Methomyl
  • February 2009 – Appendix C: S-methyl-N((methylcarabamoyl)oxy)thioacetimidate (Methomyl) Method Development and Analytical Results for Application Air Monitoring Samples in Fresno County
  • February 2009 – Appendix D: Field Log Sheets
  • February 2009 – Appendix E: Calibration/Certification Reports
  • February 2009 – Appendix F: Meteorological Data
  • December 2008 – Report on Ambient Air Monitoring for Methomyl and Carbaryl in Fresno, Tulare and Kings Counties during July and August 2007
  • December 2008 – Appendix A
  • December 2008 – Appendix B: Protocol for the Ambient Air Monitoring of Methomyl and Carbaryl
  • December 2008 – Appendix C: Methomyl and Carbaryl Method Development and Analytical Results for Ambient Air Monitoring Samples
  • December 2008 – Appendix D
  • December 2008 – Appendix E
  • September 2006 – Initiation of Risk Assessment Process for the Active Ingredient Methomyl
  • February 2004 – Monitoring of Ground Applicators Applying Pesticides in Arbor Trellised Vineyards or T-type Cross Arm Trellised Vineyards
  • February 2003 – A Study of Dislodgeable Foliar Residues of Methomyl, Phosmet and Propargite on Grapes in Fresno, Kern and Madera Counties, 1990
  • September 2002 – Project 0205 - Methomyl Reentry Incident in Kern County (40-KER-02)
  • January 2002 – Equations for Predicted Values and Prediction Limits for Dislodgeable Foliar Residues
  • April 1999 – Illness Among Grape Girdlers Associated with Dermal Exposure to Methomyl
  • May 1998 – Air Monitoring Results of Metalaxyl and Methomyl Applied to a Potato Field in San Diego County, 1996
  • June 1996 – Monitoring a Field Application to Determine Air Concentrations of Methomyl and Metalaxyl, San Diego County December 1995 – Monterey County Residential Air Monitoring
  • December 1991 – Calculated Reentry Interval for Table Grape Harvesters Working in California Vineyards Treated with Methomyl
  • September 1991 – Dissipation of Methomyl Residues on the Foliage of Greenhouse-Grown Cucumbers, 1991
  • March 1990 – Discussion/Decision Document on Whole Leaf Dislodgeable Foliar Residue (WLDFR) Sampling
  • March 1990 – Characterization of Methomyl Dissipation on Grape Foliage
  • November 1989 – Analysis on Under-Canopy Air in Grape Vineyards Treated with Methomyl to Investigate the Potential for Inhalation Exposure
  • February 1988 – A General Survey of Foliar Pesticide Residues and Air Concentration Levels Following Various Greenhouse Applications, 1986
  • April 1985 – Degradation of Dislodgeable Methomyl Residue on Sweet Corn Foliage and Husks
  • March 1985 – Summary of Illnesses and Injuries due to Occupational Exposure to Pesticides of Ground Applicators Reported by Physicians in California in 1984
  • September 1981 – Human Occupational Illnesses and Injuries due to Exposure to Methomyl as Reported by Physicians in California in 1980
  • December 1980 – Occupational Illnesses and Injuries due to Exposure to Methomyl in California in 1979
  • March 1977 – A Study of the Degradation of Methomyl (Lannate) in and on the Leaves, Husks and Silk on Sweet Corn and the Soil in a Field in Yolo County, California, July 1976
  • March 1977 – Study of the Degradation of Lannate (Methomyl) on Outer Leaves of Head Lettuce in Imperial County, California, February 1975
  • January 1977 – A Study of the Decay of Lannate (Methomyl) on Grape Foliage in Fresno County, California August 1974
  • December 1976 – Decay of Lannate (Methomyl) Residue on Sweet Corn Leaves in Riverside County, California, May 1976
  • December 1976 – Lannate (Methomyl) Residue on Young Head Lettuce in Imperial County, California - January 1976
  • September 1976 – Human Health and Safety Problems in California in the use of Methomyl as a Pesticide when Formulated as a Powder Containing 90% Active Ingredients
  • June 1976 – A Study of the Decomposition of Lannate (Methomyl) on Lettuce in Imperial County, California February 1975
  • May 1975 – A Study of Methomyl Residue on Sweet Corn Ears
  • April 1975 – Summary of Pesticide Safety Studies Conducted in Imperial County, California During January and February 1975
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