NC State Extension Publications


Skip to Introduction
Trade Name: Barricade, Prodiamine, Resolute, Regalkade G Common Name: prodiamine Formulations: 65 WG, 4FL* / 0.5 G

Selective preemergence residual control of many annual grasses and some broadleaf weeds in turf, landscapes, nursery crops, and Christmas tree farms.

Amount of Active Ingredient Amount by Formulation
65 WG 4 FL 0.5 G
Per Acre 0.75 to 1.5 lb 1.15 to 2.3 lb 21 to 48 oz 150 to 300 lb
Per 1,000 sq. ft. 0.27 to 0.54 oz 0.42 to 0.84 oz 0.5 to 1.1 oz 3.4 to 7 lb

Major Weeds Controlled

Skip to Major Weeds Controlled

Annual grasses such as crabgrass, goosegrass, foxtails, barnyardgrass, annual bluegrass, and broadleaf signalgrass. Some annual broadleaf weeds such as carpetweed, chickweed, henbit, knotweed, oxalis, shepherdspurse, spurge, lambsquarters, and pigweed.

Major Weeds Not Controlled

Skip to Major Weeds Not Controlled

Established weeds, perennial grasses, and large-seeded broadleaf weeds. Weak on American burnweed, bittercress, common groundsel, eclipta, morningglory, phyllanthus, ragweed, and dogfennel. Does not control nutsedge.

For Best Results

Skip to For Best Results

Apply before weeds emerge. In newly planted or potted ornamentals, water plants to settle the soil before applying Barricade. Barricade must be incorporated with 12-inch of rainfall or irrigation or with shallow cultivation as soon as possible after application. Incorporation should not be delayed more than 14 days after application.

Cautions and Precautions

Skip to Cautions and Precautions

Spray applications are more injurious to ornamentals than granular treatments. Young, tender foliage is more sensitive to injury than mature foliage. Do not use in propagation or liner production. On landscape ornamentals and nurseries no more than 1.5 lb ai/A may be applied in a calendar year. On turf, no more than 1.15 lb/A or the maximum yearly application rate, whichever is less, may be applied in any 60-day period. Maximum yearly application rates range from 1.0 to 2.3 lb/A, depending upon turf species.

Residual Activity

Skip to Residual Activity

In containers, expect no more than 6 to 8 weeks of residual control in the Southeastern U.S. (perhaps longer residual in northern climates). In field situations or landscape plantings from 10 to 16 weeks of residual grass control can be expected. Split applications usually provide longer residual weed control compared to single high-dose treatments.

Volatility and Leaching Potential

Skip to Volatility and Leaching Potential

Photodecomposition and volatilization occur when the product remains on the surface for prolonged periods without incorporation. Strongly adsorbed by soil; not readily leached. Degrades rapidly in saturated soils.

Symptoms and Mode of Action

Skip to Symptoms and Mode of Action

Absorbed through roots and inhibits root and shoot growth, through interference with cell division. Foliar symptoms include stunted, yellowed new growth. Stem girdling and swelling at the soil line may occur in some sensitive species. Root tips exposed to the herbicide will swell producing “club-like” roots. MOA Group 3.

Additional Information

Skip to Additional Information
Worker Protection Standards REI: 12 hours
PPE: coveralls, chemical resistant gloves, shoes plus socks
Manufacturer: Syngenta (and others) EPA Reg. # 100-1139
GR formulation: Regal Chemical Co.

* Caution: When the product is available in more than one formulation, the formulation designated with the asterisk (*) was used as the primary source of information for this publication.


Professor of Weed Science and Extension Specialist
Horticultural Science

Publication date: Nov. 13, 2014
Revised: Jan. 29, 2021

Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by NC State University or N.C. A&T State University nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance, contact your local N.C. Cooperative Extension county center.

N.C. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status.