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1 June 2017 Relative Safety of Preemergence Corn Herbicides Applied to Coarse-Textured Soil
Kurt M. Vollmer, Mark J. VanGessel, Quintin R. Johnson, Barbara A. Scott
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Abstract

Crop safety is an important consideration in determining PRE herbicide application, especially when multiple herbicide sites-of-action are used. This research examined relative corn injury as the result of PRE applications containing ALS- and/or HPPD-inhibiting herbicides to a sandy loam soil. Herbicide premixes containing clopyralid, flumetsulam, isoxaflutole, mesotrione, rimsulfuron, tembotrione, thifensulfuron, and thiencarbazone were applied at twice the labeled rate. In general, isoxaflutole alone was the safest herbicide evaluated, while PRE applications of rimsulfuroncontaining herbicides caused the most corn stunting, had a lower recovery rate, and lower yields. However, POST applications of mesotrione plus rimsulfuron stunted corn less than 2%. Although there was little correlation between corn injury and yield, growers should be aware of the other factors, such as soil texture and environment that may impact crop production.

Nomenclature: Clopyralid; flumetsulam; isoxaflutole; mesotrione; rimsulfuron; thiencarbazone; thifensulfuron; tembotrione; corn, Zea mays L.

© Weed Science Society of America, 2017
Kurt M. Vollmer, Mark J. VanGessel, Quintin R. Johnson, and Barbara A. Scott "Relative Safety of Preemergence Corn Herbicides Applied to Coarse-Textured Soil," Weed Technology 31(3), 356-363, (1 June 2017). https://doi.org/10.1017/wet.2017.17
Received: 18 October 2016; Accepted: 1 February 2017; Published: 1 June 2017
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KEYWORDS
Area under the curve
crop recovery
cumulative stunting
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