Submitted to: Research Day Abstracts: Regional Universities Research Day
Publication Type: Proceedings
Publication Acceptance Date: 9/22/2001
Publication Date: 12/28/2001
Citation: MIDDICK, A., GREER, K., BIDLACK, J., RAO, S.C., MACKOWN, C.T. 2001. YEAR THREE OF WEED CONTROL IN PIGEON PEAS. RESEARCH DAY ABSTRACTS: REGIONAL UNIVERSITIES RESEARCH DAY. Abstract p. 76. Interpretive Summary: Abstract only
Technical Abstract: Results from the first two years of pigweed [Amaranthus retroflexus (L.)] control in pigeon peas [Cajanus cajan (L.) Millsp.] justified one more year of 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-check 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 7 July 2000 and harvested, along with weeds, on 13 October. Among pre-emergence herbicide treatments, the low rate of Lexone DF lowered weed biomass, whereas both rates of Authority and Lexone DF maintained weed populations similar to control plots. Both rates of Authority and Lexone DF maintained dpigeon pea populations and total biomass as compared with control plots. Both rates of the post-emergence herbicide, Cadre, were effective in deterring weeds, and maintaining pigeon pea populations and total biomass as the hand-weeded plots, although some damage to pigeon peas was observed. Among treatments used, Authority and Lexone DF displayed greatest potential for weed control without substantially damaging pigeon peas and winter wheat following this crop. These results concurred with results from the previous two years.