Marengo Selective Pre-Emergent Herbicide, Bayer

Marengo Selective Pre-emergent Herbicide is a liquid herbicide that offers long-term residual control of both grassy and broadleaf weeds on ornamentals grown in production nurseries including those grown in-ground and in pot-in-pot containers. Marengo may also be used on conifers, Christmas trees and greenhouse floors. Marengo can be used in ornamental production sites and hardscapes and is labeled for use in shadehouses and hoophouses in areas covered by landscape fabric, rock or under benches. 

Marengo Selective Pre-emergent Herbicide with the new active ingredient indaziflam, offers unparalleled, season-long control of many hard-to-control broadleaf weeds such as bittercress, groundsel, oxalis, marestail, and spurge. Marengo also controls tough grassy weeds such as crabgrass, annual bluegrass, and annual sedge. Marengo also demonstrates early post-emergence activity against some weeds, including annual bluegrass, crabgrass, and oxalis. 

Marengo Selective Pre-emergent Herbicide in a suspension concentrate (SC) formulation contains the first active ingredient from MOA (Mode of Action) Group 29. The active ingredient prevents weed seed germination by inhibiting cellulose biosynthesis. Marengo does not move once applied to the soil and does not volatilize. Marengo should be applied as a broadcast spray over ground areas and as a directed spray for field grown ornamentals. 

Marengo use rates range from 7.5 to 18.5 fl. oz. per acre depending on soil type and conditions. Marengo should be applied in a minimum of 10 gal. of water per acre (one quart of water per 1,000/sq. ft.). Marengo performs best when applied to bare ground or mixed with a post-emergent herbicide to eliminate existing weeds. If tank mixing with Roundup® or Finale®, mix Marengo in the tank thoroughly before adding Roundup or Finale. For best results, users should activate Marengo with a minimum of ¼ inch of water within 2 days of application.