K. Al-khatib et al., Control of imazethapyr-resistant common sunflower (Helianthus annuus) in soybean (Glycine max) and corn (Zea mays), WEED TECH, 14(1), 2000, pp. 133-139
Field experiments were conducted in 1997 and 1998 near Rossville in northea
st Kansas to evaluate control of imazethapyr-resistant common sunflower wit
h selected herbicides in corn and soybean. In soybean, common sunflower con
trol was unacceptable with imazethapyr, chlorimuron, CGA-277476, and cloran
sulam applied alone. Lactofen or acifluorfen applied with these herbicides
slightly improved control, whereas glyphosate applied with them controlled
more than 97% of common sunflower. All herbicides reduced common sunflower
populations in the corn. The greatest reductions occurred when atrazine was
applied with dicamba, 2,4-D, RPA 201772, or CGA-152005 plus primisulfuron.
These herbicide combinations also stunted common sunflower that survived t
reatment. Several herbicide alternatives are available to control imazethap
yr-resistant common sunflower in corn. However, glyphosate was the only her
bicide that gave adequate control in soybean.