Distribution of Glyphosate- and Thifensulfuron-Resistant Palmer Amaranth (Amaranthus palmeri) in North Carolina

Table 1

Number of Palmer amaranth biotypes controlled at least 90% by glyphosate and thifensulfuron and the number and percentage of Palmer amaranth biotypes not controlled by the highest rate of glyphosate and thifensulfuron.

Herbicide	Number of Palmer amaranth biotypes
	Controlled 90% by each rate			Controlled less than 90% by the highest rate*
	g ae ha^−1
Glyphosate	280	560	840	126 (93)
	3	4	8
	g ae ha^−1
Thifensulfuron	4.37	17.5	70.0	64 (48)
	5	50	70

∗Value in parenthesis represents the percentage of Palmer amaranth biotypes.