How to Manage Pests

UC Pest Management Guidelines


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

(Reviewed 11/05, updated 1/10)

In this Guideline:

Common name
(trade name)
Mode of action1 Selectivity2
(affected groups)
Predatory mites3 General predators4 Parasites4 Honey bees5 Duration of impact to natural enemies6
Bacillus thuringiensis ssp. aizawai 11 narrow (caterpillars) L L L IV short
Bacillus thuringiensis ssp. kurstaki 11 narrow (caterpillars) L L L IV short
carbaryl (Sevin) bait 1A narrow (cutworms, army-worms, grasshoppers, etc.) L L L IV short
carbaryl (Sevin) 80 1A broad (insects, mites) M/H H H I8 long
carbaryl (Sevin) XLR Plus 1A broad (insects, mites) L H L I9 long
chlorpyrifos (Lorsban) 1B broad (insects, mites) M H H I10 moderate
esfenvalerate (Asana) 3 broad (insects, mites) H M H I11 moderate
imidacloprid (Admire) 4A narrow (sucking insects, beet armyworm, cutworms) L I12
insecticidal soap (M-Pede) broad (exposed insects, mites) M M M IV short
methomyl (Lannate) 1A broad (insects, mites) H H H III moderate
methoxyfenozide (Intrepid) 18A narrow (caterpillars) L L L IV short
naled (Dibrom) 1B broad (insects, mites) H H H I13
oxydemeton-methyl (MSR Spray Concentrate) 1B narrow (sucking insects, mites) H H H III moderate
petroleum oils broad (exposed insects, mites) L14 L L III short
phorate (Thimet) granules 1B IV short
spinosad (Entrust, Success) 5 narrow (caterpillars, whiteflies, aphids, leafminers) L/H M15 L/M III short to moderate
sulfur narrow (mites) L/H M/L H IV short
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 more information, see
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 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.
6 Duration: short means hours to days; moderate means days to 2 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 lb a.i. or less, rating is II.
9 If rate is 1.5 lb a.i. or less and dilution not greater than 1:19, rating is II.
10 If rate is 0.05 lb a.i./acre or less, rating is III.
11 If rate is 0.025 lb a.i./acre, rating is II.
12 If rate is 0.1 lb a.i./acre, rating is II.
13 If rate is 0.5 lb a.i./acre or less, rating is III.
14 Rating depends on rate used.
15 Toxic against some natural enemies (predatory thrips, syrphid fly larvae) when sprayed and shortly after (8-24 hours).



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Sugarbeet
UC ANR Publication 3469

Relative Toxicities of Insecticides and Miticides Used in sugarbeet 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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