How to Manage Pests

UC Pest Management Guidelines

Onion and Garlic

Relative Toxicities to Insecticides and Miticides Used in Onion and Garlic to Natural Enemies and Honey Bees

(Reviewed 1/07, updated 5/10, pesticides updated 6/16)

In this Guideline:


Common name (Example trade name) Mode of action1 Selectivity2 (affected groups) Predatory mites3 General predators4 Parasites4 Honey bees5 Duration of impact to natural enemies6
abamectin (Agri-Mek) 6 moderate (mites, leafminers, thrips) M L M/H I moderate to predatory mites and affected insects
azadirachtin (Neemix) un broad (insects, mites) M L/M L/M II short
chlorpyrifos (Lorsban) 1B broad (insects, mites) M H H I moderate
cyromazine (Trigard) 17 narrow (leafminers) L L L II none
diazinon 1B broad (insects, mites) L H H I moderate to long
lambda-cyhalothrin (Warrior) 3A broad (plant bugs, beetles, caterpillars) H H H I moderate
methomyl (Lannate) 1A broad (insects , mites) H H H I moderate
permethrin (Ambush, Pounce) 3A broad (insects, mites) L H H I long
spinetoram (Radiant) 5 narrow (caterpillars, thrips, whiteflies, aphids, scales, leafminers) M M8 L/M II moderate7
spinosad (Entrust, Success) 5 narrow (thrips, leafminers) M M8 L/M II short to moderate
spirotetramat (Movento) 23 narrow (aphids, scale, psyllids, whiteflies) L L L II short
zeta-cypermethrin (Mustang) 3A broad (insects, mites) H M M I moderate
 
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 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 Generally, toxicites are to western predatory mite, Galendromus occidentalis.
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 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.
6 Duration: Short means hours to days; moderate means days to 2 weeks; and long means many weeks or months.
7 Residual is moderate if solution is between pH of 7 to 8.
8 Toxic against some natural enemies (predatory thrips, syrphid fly and lacewing larvae, beetles) when sprayed and up to 5 to 7 days after, especially for syrphid fly larvae.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Onion and Garlic
UC ANR Publication 3453

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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