Submitted to: Research Day Abstracts: Regional Universities Research Day
Publication Type: Proceedings
Publication Acceptance Date: 10/1/2000
Publication Date: 10/27/2000
Citation: Shantz, D., Petersen, E., Bidlack, J., Rao, S.C., Mackown, C.T. 2000. Year two of weed control in pigeon peas. Research Day Abstracts: Regional Universities Research Day. Abstract No. M&S 155.
Technical Abstract: Promising results from the first year of pigweed [Amaranthus retroflexus (L.)] control in pigeon peas [Cajanus cajan (L.) Millsp.] prompted additional studies to confirm the reliability of herbicide treatments. 'Georgia-2' pigeon peas were evaluated in response to two rates of the following herbicides: Authority (PRE), Cadre (POST), Lexone DF (PRE), and Poast (POST); plus hand-weeded and weedy control plots. Field plots were established as a randomized complete block design with three replications and ten treatments at the USDA-ARS Grazinglands Research Laboratory in El Reno, Oklahoma. Pigeon Peas were planted on 25 May 1999 and harvested, along with weeds, on 22 September. Among pre-emergence herbicide treatments, all rates of Authority and Lexone DF were as effective in deterring weeds as the hand-weeded treatments. Both rates of the post- emergence herbicide, Cadre, were effective in controlling pigweed populations. Both rates of Cadre were just as effective in maintaining pigeon pea populations and total biomass as the hand-weeded plots, although some damage to pigeon peas was observed. High rates of Authority and Lexone DF significantly deterred weeds, with minimal damage to pigeon peas, compared with weedy control plots. Among treatments used, Authority and Lexone DF displayed greatest potential for weed control without substantially damaging pigeon peas and/or winter wheat following this crop. These results concurred with results from the previous year.