How to Manage Pests

UC Pest Management Guidelines

Blueberry

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

(Reviewed 4/14 , updated 4/14 , corrected 10/16)

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
acetamiprid (Assail) 4A moderate (sucking insects, larvae) 7 II moderate
azadirachtin (Aza-Direct) un broad (insects, mites) M L/M L/M II short
fenpropathrin (Danitol) 3A broad (insects, mites) H H H I
imidacloprid: systemic (Admire Pro) 4A narrow (sucking insects) 7 H I short to moderate
malathion 1B broad (insects, mites) M H H I moderate
methomyl (Lannate) 1A broad (insects, mites) H H H I moderate
pyrethrin (Evergreen, PyGanic) 3A broad (insects) M M I short
spinetoram (Delegate) 5 broad (caterpillars, aphids, scales) L/M M M/H II moderate8
spinosad (Entrust, Success) 5 narrow (caterpillars, aphids, scales) L M L/M II short
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).
2 Selectivity: Broad means it affects most groups of insects and mites; narrow means it affects only a few specific groups.
3 Generally, toxicities 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 May cause flare-ups of spider mite populations.
8 Residual is moderate if solution is between pH of 7 to 8.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Blueberry
UC ANR Publication 3542

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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