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Crop and Pest Management Guidelines

A Cornell Cooperative Extension Publication
Skip Navigation LinksHome > Cornell Guidelines > 2024 Trees and Shrubs Table of Contents > 4 Weed Management in Nursery Crops > 4.8 Description and Characteristics of Herbicides Registered for Nursery and Landscape Use > Devrinol
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Devrinol

Common Name: napropamide

Formulation: 2-XT

Uses: Preemergence herbicide for control of many annual grasses and broadleaf weeds in container and field-grown trees and shrubs, turfgrass, and herbaceous ornamentals and ground covers. May be used in liner beds, newly transplanted or established nursery crops, landscape plantings, and Christmas trees. Ornamental uses are described in a supplemental label.

Amount of active ingredient

Amount by formulation

2-XT

Per Acre

4 to 6 lb.

2-3 gal.

Per 1,000 sq. ft.

6-8.8 fl. oz

Major Weeds Controlled: Annual grasses and some annual broadleaves including chickweed, crabgrass, bromes, groundsel, knotweed, and filaree.

Major Weeds Not Controlled: The following are generally not controlled from seed: bindweed, morning glory, mustard, nightshade, horsenettle, jimsonweed, yellow woodsorrel, horseweed, and spurge. Large-seeded broadleaf weeds, perennials, and established weeds are not controlled.

For Best Results: Apply to freshly weeded (or cultivated) soil before weeds germinate. Dormant-season treatments, i.e., November through March, have been successful. Incorporate immediately by tillage, irrigation, or rainfall. Control may decrease if water is not provided within two to three days of application. See label for use on potting soil mixes.

Cautions and Precautions: Apply to newly planted container stock after soil is settled from first watering. Can burn young, tender foliage on some plants. It is best applied before budbreak or after the new growth has matured. Devrinol is registered for use in warm-season turf but will injure cool-season species.

Residual Activity: Full-season grass control can be expected from a single spring application. At the higher rates, carryover can affect the establishment of grass cover crops seeded in late summer or early fall.

Volatility and Leaching Potential: Moderately volatile. Photolabile. Incorporation via irrigation or cultivation will reduce losses caused by volatility and photodegradation. Leaching is negligible.

Symptoms and Mode of Action: Inhibits root growth. Susceptible weeds do not emerge. Crop injury may be associated with inhibited root growth, manifested in wilting during periods of stress, or with the contact-type burning action on young, tender foliage. Also, rarely, can reduce plant height and vigor of herbaceous ornamentals.

Manufacturer: United Phosphorus, Inc.

EPA Reg. No. 70506-301