How to Manage Pests

UC Pest Management Guidelines


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

(Reviewed 1/09, updated 9/12, pesticides updated 4/16)

In this Guideline:

Common name (trade name) Mode of Action1 Selectivity2
(affected groups)
General predators3 Parasites3 Honey bees4 Duration of impact to natural enemies5
carbaryl (Sevin 4F) 1A broad (insects) H H I long
carbaryl (Sevin XLR Plus) 1A broad (insects) H H I long
cyfluthrin (Baythroid XL) 3A broad (insects) H H I moderate
esfenvalerate (Asana XL) 3A broad (insects) M H I moderate
flonicamid (Beleaf 50SC) 9C narrow (aphids) L L III short
imidacloprid (Admire Pro) 4A narrow (sucking insects) I
insecticidal soap (M-Pede) broad (exposed insects) L L III short
malathion (Malathion 8 Aquamul) 1B broad (insects) H H I moderate
methomyl (Lannate LV, SP) 1A broad (insects) H H I moderate
methoxyfenozide (Intrepid 2F) 18A narrow (caterpillars) L II short
spinetoram (Radiant SC) 5 narrow (caterpillars, whiteflies, aphids) M6 M/H II moderate7
spinosad (Entrust, Success) 5 narrow (caterpillars, thrips, leafminers) M6 L/M II short to moderate
thiamethoxam (Platinum 75SG) 4A narrow (sucking insects) M/H M/H I moderate
zeta-cypermethrin (Mustang) 3A boad (insects,) M M I moderate
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).
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 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 label and regulations; III–No bee precaution, except when required by the label or regulations. For more information about pesticide synergistic effects, see Bee Precaution Pesticide Rating.
5 Duration: short means hours to days; moderate means days to 2 weeks; and long means many weeks or months.
6 Toxic against some natural enemies (predatory thrips, syrphid fly and lacewing larvae, beetles) when sprayed and up to 5-7 days after, especially for syrphid fly larvae.
7 Residual is moderate if solution is between 7 and 8.



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Carrot
UC ANR Publication 3438

General Information

Acknowledgments: 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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