How to Manage Pests

UC Pest Management Guidelines

Potato

Relative Toxicities of Insecticides and Miticides Used in Potatoes to Natural Enemies and Honey Bees

(Reviewed 8/07, updated 5/08, corrected 10/16)

In this Guideline:


Common name (trade name) Mode of action1 Selectivity2 (affected groups) Predatory mites3 General predators4 Parasites4 Honey bees5 Duration of impact to natural enemies6
abamectin (Agri-Mec EC) 6 moderate (psyllids) M L M/H I moderate to affected insects
carbaryl (Sevin bait) 1A narrow (cutworms) L L L III short
carbaryl (Sevin S) 1A broad (insects, mites) M/H M/H H I long
cyfluthrin (Baythroid) 3A broad (insects, mite) H H H I moderate
dinotefuran (Venom) 4A narrow (sucking insects) L L I short
endosulfan (Endosulfan EC) 2A broad (insects, mites) L M M II short
esfenvalerate (Asana XL) 3A broad (insect, mites) H M H I moderate
ethoprop (Mocap) –soil appl. 1B narrow (soil insects) L L L II short
imidacloprid (Admire) 4A narrow (sucking insects) L I
imidacloprid (Provado) 4A narrow (sucking insects) H I short to moderate
indoxacarb (Avaunt) 22A narrow (caterpillars) L L I moderate
methamidophos (Monitor) 1B broad (insects, mites) M M M I moderate
methomyl (Lannate LV) 1A broad (insects, mites) H H H I moderate
novaluron (Rimon) 15 narrow (caterpillars) L L I short
spinosad (Entrust, Success) 5 narrow (caterpillars, thrips) L M7 L/M II moderate7
spiromesifen (Oberon SC) 23 narrow (psyllids, whiteflies) II
H = high     M = moderate     L = low     — = no information    un = unknown or uncertain mode of action
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 Generally, toxicites are to western predatory mite, Galendromus occidentalis. Where differences have been measured in toxicity of the pesticide-resistant strain versus the native strain, these are listed as pesticide-resistant strain/native strain.
4 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.
5 Ratings are as follows: I—Do not apply or allow to drift to plants that are flowering; II—Do not apply or allow to drift to plants that are flowering, except when the application is made between sunset and midnight if allowed by the pesticide label and regulations; III—No bee precaution, except when required by the pesticide label or regulations. For more information about pesticide synergistic effects, see Bee Precaution Pesticide Ratings.
6 Duration: short means hours to days; moderate means days to 2 weeks; and long means many weeks or months.
7 Toxic against some natural enemies (predatory thrips, syrphid fly and lacewing larvae, beetles) when sprayed and up to 5-7 days after, expecially for syrphid fly larvae.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Potato
UC ANR Publication 3463

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.

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