NC State Extension Publications


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Trade Name: Marengo, Specticle, Esplanade Common Name: indaziflam Formulations: 0.622 SC* / 1.67 SC / 0.0224 GR

Selective preemergence residual control of many annual grasses and broadleaf weeds in field and container grown nursery crops, Christmas trees, non-production areas in container nurseries, and in greenhouses and similar covered structures. The SC formulation should be used as a directed spray avoiding contact with crop foliage. Sold as Marengo for use in Nurseries, and as Specticle for landscape and turfgrass uses. Esplanade has a special local need (FIFRA 24-C) label for use in Christmas tree production in Michigan, North Carolina, Oregon, Pennsylvania, Washington and Wisconsin. Recommended rates of application differ between use sites. Check the label for details.

Amount of Active Ingredient Amount of Formulation Herbicide
0.622 SC (Marengo or Specticle) 1.67 SC (Esplanade) 0.0224 GR
Per Acre

0.0224 – 0.075 lb*

*note: rate differences between formulations

7.5 to 15.5 fl oz 3 to 6 fl oz 100 – 200 lb
Per 1,000 sq ft 0.17 to 0.36 fl oz 0.069 to 0.138 fl oz 2.3 – 4.6 lb

Major Weeds Controlled

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Preemergence control of annual grasses such as crabgrass, goosegrass, foxtails, barnyardgrass, and annual bluegrass; annual broadleaf weeds including bittercress, doveweed, oxalis, spurge; and annual sedges from seed. The SC formulation may provide postemegence control of some small seedling broadleaf weeds; in particular, good postemergence control of oxalis has been reported.

Major Weeds Not Controlled

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Emerged weeds are not controlled with the granular formulations. Does not control nutsedge. Poor control of Japanese stiltgrass, marsh parsley and eclipta have been observed. Weeds sprouting from vegetative organs like rhizomes, tubers and bulbs are not controlled. Control of common ragweed and some pigweeds has been variable. Efficacy on large-seeded broadleaf weeds, such as morningglory, is unknown.

For Best Results

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Use the SC formulation as a directed spray only. Apply before weeds emerge. In newly planted ornamentals, water plants to settle the soil before applying. Marengo must be incorporated with about 12-inch of rainfall or irrigation as soon as possible after application.

Cautions and Precautions

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Apply as a directed spray. Spray applications over the top of crop plants can be injure plants. Young, tender foliage is more sensitive to injury than mature foliage. Do not use the SC formulation in container crops less than 15 gal. Not for use in propagation beds, herbaceous perennials, or liner production. Injury to hydrangea and euonymus has been reported. Excess doses have cause stem girdling and root inhibition in young, newly planted liners in some species, including red maple.

Residual Activity

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About 4 months of residual weed control is expected. Under some environmental conditions, longer residual may be observed. In field sites, residual may last more than 6 months. Spring applications may interfere with establishment of fall-seeded cover crops; annual ryegrass is especially sensitive to indaziflam residues.

Volatility and Leaching Potential

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Adsorbed by soil; not readily leached. Low volatility.

Symptoms and Mode of Action

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Absorbed through roots and shoot tissues. Inhibits root and shoot growth, through interference with cell wall formation and cell division; specifically by inhibiting cellulose biosynthesis. Foliar symptoms include stunted, yellowed new growth. Stem girdling and swelling at the soil line may occur in some sensitive species. See the herbicide injury fact sheet for images. Mode of Action Group 29.

Additional Information

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Worker Protection Standards REI: 12 hours
PPE: coveralls, waterproof gloves, shoes plus socks
Manufacturer: Bayer EPA Reg. # 432-1607

* 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: May 30, 2014
Revised: Feb. 21, 2023

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.

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