UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 
  Printer-friendly version

How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Rice

Relative Toxicities of Pesticides Used in Rice to Natural Enemies and Honey Bees

(Reviewed 4/04, updated 2/09)

In this Guideline:
Common name (trade name) Mode of action1 Selectivity2 (affected groups) General predators3 Parasites3 Honey bees4 Mosquito fish (Gambusia sp.) Duration of impact to natural enemies5
carbaryl (Sevin) 4F, 50, 80 1A broad (insects, other invertebrates) H H I H long
carbaryl (Sevin) XLR Plus 1A broad (insects, other invertebrates) H L III H long
copper sulfate pentahydrate — narrow (insects, other invertebrates) M L — M moderate
diflubenzuron (Dimilin) 15 narrow (insects, other invertebrates) M L IV L moderate
lambda-cyhalothrin (Warrior) 3 broad (insects, other invertebrates) H H I H long
malathion 1B broad (insects) H H II L-M moderate
zeta-cypermethrin (Mustang) 3 broad (insects, other invertebrates) M M I H long
H = high M = moderate L = low — = no information
1 Rotate chemicals with a different mode-of-action Group number, and do not use products with the same mode-of-action Group number more than twice per season to help prevent the development of resistance. For example, the organophosphates have a Group number of 1B; chemicals with a 1B Group number should be alternated with chemicals that have a Group number other than 1B. Mode of action Group numbers are assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.
2 Selectivity: broad means it affects most groups of insects and mites; narrow means it affects only a few specific groups.
3 Toxicities are averages of reported effects and should be used only as a general guide. Actual toxicity of a specific chemical depends on the species of predator or parasite, environmental conditions, and application rate.
4 Ratings are as follows: I-Do not apply to blooming plants; II-Apply only during late evening; III-Apply only during late evening, night, or early morning; and IV-Apply at any time with reasonable safety to bees. For more information, see How to Reduce Bee Poisoning From Pesticides (700 KB, PDF), Pacific Northwest Extension Publication PNW591.
5 Duration: short means hours to days; moderate means days to 2 weeks; and long means many weeks or months.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Rice
UC ANR Publication 3465
General Information
Acknowledgements: This table was compiled based on research data and experience of University of California scientists who work on a variety of crops and contribute to the Pest Management Guideline database, and from Flint, M. L. and S. H. Dreistadt. 1998. Natural Enemies Handbook: An Illustrated Guide to Biological Pest Control, ANR Publication 3386.

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2010 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/r682000311.html revised: November 29, 2010. Contact webmaster.