My colleague Hannah Mathers just shared with me that the label of the herbicide Marengo® now includes greenhouses floors. This is good news because of the limited number of herbicides available for greenhouse growers.
Marengo® is a pre-emergent selective liquid herbicide that offers long-term residual control of both grassy and broadleaf weeds on ornamentals. It 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. The active ingredient (Mode of Action Group 29) prevents weed seed germination by inhibiting cellulose biosynthesis. Marengo does not move once applied to the soil and does not volatilize.
Users should avoid applications when spray particles may be carried by air currents to areas where sensitive crops and plants are growing. Avoid spraying with winds in excess of 10 mph.
For more information, go to: http://www.ohp.com/Products/marengo.php.
Claudio Pasian
Associate Professor
