Field studies were conducted from 2003 to 2006 to evaluate bundleflower (Desmanthus bicornutus) tolerance to several post-emergence herbicides commonly used in pastures. All the herbicides, except for imazapic, metsulfuron and 2,4-DB injured bundleflower at least 88 when rated at 4 weeks after treatment (WAT). When rated at 8 WAT, metsulfuron, picloram, and picloram plus 2,4-D injured bundleflower greater than 90. Imazapic stunted bundleflower (10-35 injury) throughout the growing season. When rated at 52 WAT, dicamba plus 2,4-D, picloram alone, and picloram plus 2,4-D injured bundleflower at least 97 in one of two years. Emergence of bundleflower with picloram-containing treatments ranged from 16 to 67 of the nontreated control, whereas the emergence after dicamba-containing treatments ranged from 67 to 97.
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