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How to Manage Pests

UC Pest Management Guidelines

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Dry Beans

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

(Reviewed 8/07, updated 10/10)

In this Guideline:
Common name (trade name and formulation) Mode of action1 Selectivity2 (affected groups) Predatory mites3 General predators4 Parasites4 Honey bees5 Duration of impact to natural enemies6
acephate (Orthene SP) 1B broad (insects, mites) H H M/H I moderate
aldicarb (Temik) at planting 1A broad (insects, mites) M M M IV7 long
Bacillus thuringiensis ssp. aizawai 11.B1 narrow (caterpillars) L L L IV short
Bacillus thuringiensis ssp. kurstaki 11.B2 narrow (caterpillars) L L L IV short
bifenazate (Acramite) UNC narrow (spider mites) L L L III short
carbaryl (Sevin S) 1A broad (insects, mites) M/H H H I long
carbaryl (Sevin XLR Plus) 1A broad (insects, mites) L H H I8 long
cryomazine (Trigard) 17 narrow (leafminers) L L L III short
dicofol (Dicofol 4E) UNC narrow (pest mites and mites) H M M IV long to beneficial mites
dimethoate (EC) 1B broad (insects, mites) H H H I long
lambda-cyhalothrin (Warrior) 3 broad (plant bugs, beetles, caterpillars) H H H I9 moderate
malathion (EC) 1B broad (insects, mites) M H H II moderate
methomyl (Lannate SP) 1A broad (insects , mites) H H H III moderate
propargite (Omite) 12C narrow (pest mites) M10 L L IV short
spinetoram (Radiant) 5 narrow (caterpillars, thrips, whiteflies, aphids, scales, leafminers) L M11 L/M III moderate12
spinosad (Entrust, Success) 5 narrow (caterpillars, thrips, whiteflies, aphids, leafminers) L M11 L/M III short to moderate11
zeta-cypermethrin (Mustang) 3 broad (insects, mites) H 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 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) UNC = MOA uncharacterized. 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, toxicities 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 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 (700 KB, PDF), Pacific Northwest Extension Publication PNW591.
6 Duration: short means hours to days; moderate means days to two weeks; and long means many weeks or months.
7 Not hazardous to bees when applied at least 4 weeks before bloom.
8 If rate is 1.5 lb a.i. or less and dilution not greater than 1:19, rating is II.
9 If rate is 0.02 lb a.i./acre, rating is II.
10  Use lowest rates for best management of western predatory mite/spider mite ratio.
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.
12 Residual is moderate if solution is between pH of 7 to 8.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Dry Beans
UC ANR Publication 3446
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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