Python

AMVAC · EPA Reg 5481-677 · Herbicide Document last checked 2026-05-30

About this product

Active ingredient Pending extraction

Manufacturer AMVAC

Category Herbicide

Full details for Python

EPA registration data Reg. 5481-677 — registry reference, signal word and status.

Applicator discussion

Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.

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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. 5481-677 →

Python Herbicide is a specialized herbicide designed for use in labeled clover grown for seed. It is a FIFRA Section 24(c) Special Local Need (SLN) label intended for distribution and use only within the State of Oregon. The active ingredient is Flumetsulam at a concentration of 80.0%. This product is used to control labeled broadleaf weeds, specifically including Brassicaceae species, Dock species, and Mayweed Chamomile. It is applied to various clover types including Red, White, Berseem, Balansa, and Crimson clover at different growth stages. For Red Clover grown for seed, it is applied during the preemergence to the four-trifoliate leaf stage. For Crimson, Berseem, and Balansa clover, it is applied at the two-trifoliate leaf stage or larger. For Red and White clover, it is applied during the four-trifoliate leaf stage to fully established stages between November 1 and March 1. When applying, users should include a non-ionic surfactant at a rate of 25% volume/total volume. Note that postemergence applications may result in temporary chlorosis or yellowing of the clover leaves. Users must follow specific crop rotation intervals and restrictions regarding the use of the resulting seed for food or feed, as this pesticide does not have an established pesticide residue tolerance for these crops.

Pests covered (2)

Labeled Broadleaf Weeds (including Brassicaceae species, Dock species, and Mayweed Chamomile)Broadleaf Weeds, Clover

Areas treatable (1)

Clover grown for seed (Red, White, Berseem, Balansa, Crimson)

How to treat each type of area 1

Clover grown for seed (Red, White, Berseem, Balansa, Crimson)

Target pest	Location	Rate	Unit	Label notes
Labeled Broadleaf Weeds (including Brassicaceae species, Dock species, and Mayweed Chamomile)	Outdoor	0.66 or 1.33	oz/ac	Application timing depends on clover type and growth stage.

Mixing instructions 1

For pests	Amount	Per	Label notes
Broadleaf weeds in clover	25%	volume/total volume	Use a good quality surfactant with at least 80% active ingredient (at least 50% actual non-ionic surfactant). Do not use liquid fertilizer solutions or suspensions as the carrier.

Timing & weather

Do not apply if rainfall is expected within 6 hours after application.

Use restrictions 4

For distribution and use only within the State of Oregon.
This pesticide does not have an established pesticide residue tolerance for this crop; no portion of this seed crop may be used or distributed for food or feed for 1 year (365 days) after the last application.
Follow Crop Rotation Intervals on the main container label.
Any seed from a field treated must bear specific and conspicuous container labeling or shipment invoice/bill of lading stating the seed was produced using products for which the EPA has not established pesticide residue tolerances.