Marengo pre-emergent herbicide, from OHP, is now labeled for use on greenhouse floors.

Marengo is a selective pre-emergent alkylazine herbicide containing the new active ingredient, indaziflam,which belongs to a new MOA (Mode of Action) group 29, a class of herbicides that inhibit cellulose biosynthesis. Marengo is very water insoluble and does not volatilize.
The new use pattern allows growers to apply under benches, on ground cloth, on gravel areas, and on dirt floors, in greenhouse structures.
Marengo is now registered for use in production ornamentals (in outdoor nurseries, shadehouses, and hoophouses),conifers, Christmas trees, greenhouse floors (under benches), ornamental production sites and hardscapes.
For more information visit OHP's website.
Latest from Produce Grower
- BioWorks introduces Sandrine Copper Soap and Cintro Insecticidal Soap
- BrightFarms debuts campaign for National Quitter’s Day
- Emerald Packaging joins US Flexible Film Initiative
- Circana forecasts steady but nuanced growth for fresh produce market in 2026
- BioWorks appoints Jason Miller as director of sales and distributor relations manager
- Florida Ag Research appoints Jason Hamm as southeast USA area research manager
- Fresh Inset appoints Gordon Robertson as general manager, North America
- Texas International Produce Association announces 2026 Texas Produce Hall of Fame inductees