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Evaluation of Registered Herbicide Options for Weed Control in Round-Up Ready Field Corn (Zea mays)

Abstract: Field corn production is increasing in New Brunswick for both grain and silage uses. Corn hybrids bred for resistance to glyphosate (Round-up Ready or RR) have gained in popularity for both production systems and offer producers significant benefits, including a wide window of application and a broad spectrum of weed control. A trial to evaluate herbicide control options, both conventional and Round-up Ready, was established near Penobsquis, New Brunswick. In general, all herbicide treatments provided adequate weed control, with good control throughout the critical period for weed control in corn. In later season evaluations, PRE treatments had reduced control. This may be attributed to high weed pressures and crop residue on the soil surface. In general, POST options performed similarly or better than glyphosate. Formasulfuron plus dicamba/atrazine, nicosulfuron plus diflufenzopyr/dicamba and all glyphosate treatments evaluated consistently had the highest levels of weed control measured. Weed spectrum in the field, time available in the application window, company programs and herbicide and technology use agreements are all important considerations for proper herbicide selection for corn production.