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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Asparagus

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

(Reviewed 11/05, updated 11/05)

In this Guideline:

Common name (trade name) Chemical
class1		 Mode of
action2		 Selectivity3
(affected groups)		 Predatory
mites4		 General
predators5		 Parasites5 Honey
bees6		 Duration of impact
to natural enemies7
Bacillus thuringiensis ssp. aizawai M 11.B1 narrow (caterpillars) L L L IV short
carbaryl (Sevin) bait C 1A narrow (cutworms, army-worms, grasshoppers, etc.) L L L IV short
carbaryl (Sevin) XLR Plus C 1A broad (insects, mites) L H L III long
chlorpyrifos (Lorsban) OP 1B broad (insects, mites) M H H I moderate
disulfoton (Di-Syston) OP 1B broad (insects, mites) H H H III —
methomyl (Lannate) C 1A broad (insects, mites) H H H III moderate
permethrin (Ambush, Pounce) P 3 broad (insects, mites) L H H I long
petroleum oils CON — broad (exposed insects, mites) L L L III short to none
pyrethrin (PyGanic) B 3 broad (insects) — M M III short
pyrethrin/rotenone (Pyrellin E.C.) B/S 3/21 broad (insects) — — H III short
spinosad (Entrust, Success) M 5 narrow (caterpillars, thrips, whiteflies, aphids, scales, leafminers) L M8 L/M III short to moderate

H = high     M = moderate     L = low     — = no information

1 Chemical class: B = botanical; C = carbamate; CON = contact including smothering and barrier effect; M = microbial; OP = organophosphate; P = pyrethroid; S = synergist
2 Modes of action are important in preventing the development of resistance to pesticides. 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. 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 is assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.
3 Selectivity: broad means it affects most groups of insects and mites; narrow means it affects only a few specific groups.
4 Toxicities are to western predatory mite, Galendromus occidentalis.
5 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.
6 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, Pacific Northwest Extension Publication PNW518 (PDF 172K).
7 Duration: short means hours to days; moderate means days to 2 weeks; and long means many weeks or months.
8 Toxic against some natural enemies (predatory thrips, syrphid fly larva) when sprayed and shortly after (8-24 hrs.).

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Asparagus
UC ANR Publication 3435
General Information
Acknowledgments: This table was compiled based on research data and experience of University of California scientists working on a variety of crops.

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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