Author
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Richard Jr, Edward |
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Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 2/8/1999 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Azafenidin, is a new broad spectrum herbicide under development by DuPont for the preemergence control of seedling weeds in sugarcane. It has been evaluated in Louisiana since the 1994/1995 growing season as a replacement for one or both applications of standard fall (at planting) followed by early spring (late March/early April) sequential applications of metribuzin, terbacil, or a tank mixture of pendimethalin plus atrazine. When applied preemergence at planting, sugarcane injury following 0.56, 0.84, and 1.12 kg ai/ha azafenidin was equivalent (<10%) and no greater than the injury observed with metribuzin at 1.68 to 2.0 kg ai/ha. Azafenidin applied postemergence to sugarcane in the spring turned treated leaves red within 7 days with injury being greatest when the application was delayed until April. Injury was generally transient in nature (<20% by 45 d after treatment) and did not appear to be rate or soil type dependent. Sugar yields following single at- planting or March applications or at-planting followed by March sequential applications of azafenidin under near weed-free conditions were similar to the corresponding standard treatments. However, when spring postemergence applications were delayed until April, sugar yields were lower than the metribuzin standard. Minor differences in cultivar response at planting and/or spring applications were observed only following the spring postemergence applications of azafenidin. |
