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)

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 I6 long
carbaryl (Sevin XLR Plus) 1A broad (insects) H H I7 long
cyfluthrin (Baythroid XL) 3 broad (insects) H H I moderate
diazinon–foliar 1B broad (insects) H H I moderate to long
esfenvalerate (Asana XL) 3 broad (insects) M H I9 moderate
imidacloprid (Admire Pro) 4A narrow (sucking insects) L I10
imidacloprid (Provado 1.6F) 4A narrow (sucking insects) H II short to moderate
insecticidal soap (M-Pede) broad (exposed insects) L L IV short
malathion 1B broad (insects) H H II moderate
methomyl (Lannate LV, SP) 1A broad (insects) H H III moderate
spinosad (Entrust, Success) 5 narrow (caterpillars, whiteflies, aphids) M11 L/M III short to 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). For additional information, see their Web site at
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 (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.
6 If rate is 1 lb a.i./acre or less, rating is II.
7 If rate is 1.5 lb a.i. or less and dilution not greater than 1:19, rating is II.
8 If rate is 0.5 lb a.i./acre or less, rating is III.
9 If rate is 0.1 lb a.i./acre, rating is II.
11 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.



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Carrot
UC ANR Publication 3438

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

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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