Response for Information on Tetrachlorvinphos: Use of WP and Dust Formulations in California

Date: May 5, 2005

To: Kent L. Smith, Ph.D.
Plant Pathologist
Office of Pest Management Policy (OPMP)
Agricultural Research Service (ARS)
United States Department of Agriculture (USDA)

From: Rick Melnicoe
Director, Western Integrated Pest Management Center

Pesticide use data on livestock are very difficult to obtain. It is not reported in California like crop data.

I am trying to get some answers, but so far only have a list of products used in CA. TCVP is used in CA on cattle as a dust and in back and face rubbers. It offers alternative chemistry to synthetic pyrethroids. Alternating chemistries helps to reduce the likelihood of resistance build up in fly populations.

BACK RUBBERS AND FACE RUBBERS Active Ingredient Permethrin Tetrachlorvinphos-Dichlorvos	Example Brand Names Ectiban, Insectrin Ravap
DUST BAGS Active Ingredient Permethrin Tetrachlorvinphos Zeta-cypermethrin	Example Brand Names Permectrin, Ectiban Rabon dust Python

I will provide you with any other information I can obtain.

Rick Melnicoe
Director, Western Integrated Pest Management Center
Director, Office of Pesticide Information and Coordination (UC Statewide
Pesticide Coordinator)
One Shields Avenue
4249 Meyer Hall (FedEx Deliveries only)
University of California
Davis, CA 95616-8588
Phone: (530) 754-8378
Fax: (530) 754-8379