Trigard OMC

Syngenta · EPA Reg 100-790 · Insecticide Document last checked 2026-05-30

According to the label From the product label

These details were extracted from this product's label PDF. The label is the law. Confirm every rate, site, restriction and safety requirement against the label before mixing or applying. Check for a state supplemental label; a product may be restricted or prohibited in a state or site even when a rate appears below. · EPA registration data for Reg. 100-790 →

Trigard OMC is an insecticide designed specifically as a seed treatment for controlling onion maggots in bulb onions. It is formulated as a wettable powder containing 75.0% Cyromazine (CAS No. 66215-27-8) as the active ingredient. This product is intended for use by licensed commercial seed treatment companies only. It works by treating the seeds before planting to provide protection against onion maggot infestations. When using this product, users should be aware of environmental hazards, such as the potential for contamination of water, including surface water, interstitial areas, or groundwater, especially in areas with permeable soils or shallow water tables. For pest management efficacy, it is recommended to rotate Trigard OMC with products from other chemical classes and to integrate it with non-chemical strategies like crop rotation and field sanitation. Users should follow specific rotational crop intervals, such as 0 days for leafy vegetables (except leafy Brassica), 30 days for sweet corn, radishes, and carrots, and 300 days for any other crops. Note that not all bulb vegetables grown from seed treated with Trigard OMC within 60 days of planting may be suitable for certain uses. Always follow all precautionary statements regarding handling, storage, and disposal to ensure safety and compliance.

Pests covered (2)

onion maggotOnion Maggots

Areas treatable (1)

bulb onions

Application instructions from the label 1

bulb onions

Seed treatment chemical

Target pest: onion maggot
Location: Outdoor

Mixing instructions 1

For pests	Amount	Per	Finished strength	Label notes
onion maggot	6.6 lbs	100 lbs of seed	4.9 lbs active ingredient per 100 lbs of seed	Use standard seed treatment equipment designed for wettable powders.

Worker safety

PPE required CAUTION: Avoid contact with eyes, skin, or clothing. Avoid breathing dust.

Timing & weather

Note: not all bulb vegetables grown from seed treated with Trigard OMC within 60 days of planting are suitable.

Use restrictions 4

For use by licensed commercial seed treatment companies only.
Do not apply directly to water.
Do not use for feed, food, or oil purposes.
Do not use in animals.

Label SDS

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Document text and citations

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Reference only. Always read and follow the most current EPA-approved label on the product container. State and local restrictions may apply that are not reflected in this digitised copy. Verify the EPA registration number and revision date before use.