科研之友
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摘要
The development of dicamba (3,6-dichloro-2-methoxybenzoic acid)- and 2,4-D [(2,4-dichlorophenoxy) acetic acid]-resistant soybean [Glycine max (L.) Merr.] will increase the frequency of applying these herbicides to control broadleaf weeds in soybean production systems. We evaluated the sensitivity of randomly selected waterhemp [Amaranthus tuberculatus (Moq.) Sauer var. rudis (Sauer) Costea and Tardif] and Palmer amaranth (Amaranthuspalmeri S. Wats) populations to a single dose of dicamba and 2,4-D. Selected populations were then used in dicamba and 2,4-D dose-response experiments to evaluate: (i) visual injury at 28 d after treatment; and (ii) plant survival, biomass accumulation, and flowering at 84 DAT. Across selected populations, the estimated dicamba dose for 50% visual injury (I50) was below the recommended field rate (560 g ha(-1)) and ranged between 59 and 117 g ha(-1) for waterhemp and 43 and 81 g ha(-1) for Palmer amaranth populations. The estimated 2,4-D dose for I50 was also below the recommended field rate (800 g ha(-1)) and ranged between 127 and 242 g ha(-1) for waterhemp and 127 and 196 g ha(-1) for Palmer amaranth. Waterhemp plants flowered with up to 560 g ha(-1) dicamba and 2240 g ha(-1) 2,4-D, while Palmer amaranth plants flowered with up to 280 g ha1 dicamba, and 1120 g ha(-1) 2,4-D. Individual plants will likely survive and flower following recommended field rates of dicamba (waterhemp) and 2,4-D (both species). Close monitoring of weed populations are needed for the stewardship of available weed management technologies.
- 出版日期2016-8
