WEED CONTROL IN PIGEON PEAS

Authors: BIDLACK, J - UNIV. CENTRAL OKLA.; ELMENDORF, M - UNIV. CENTRAL OKLA.; SUNG, M - UNIV. CENTRAL OKLA.; BARABASH, V - UNIV. CENTRAL OKLA.; Rao, Srinivas; Williams, Robert

Submitted to: Research Day Abstracts: Regional Universities Research Day
Publication Type: Abstract Only
Publication Acceptance Date: 1/15/2000
Publication Date: 2/1/2000
Citation: BIDLACK, J.E., ELMENDORF, M., SUNG, M., BARABASH, V., RAO, S.C., WILLIAMS, R.D. 2000. WEED CONTROL IN PIGEON PEAS. RESEARCH DAY ABSTRACTS: REGIONAL UNIVERSITIES RESEARCH DAY. p. 67.

Interpretive Summary: Abstract Only.

Technical Abstract: Proliferation of persistent spring and summer weeds, such as johnsongrass {Sorghum halepense (L.) Pers.} and pigweed {Amaranthus retroflexus (L.)} introduces an undesirable impediment to pigeon pea production. '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 25 June 1998 and harvested, along with weeds, on 14 October. The most common weed encountered throughout the field was pigweed and thus, those herbicides labeled for control of pigweed were most successful at controlling weed populations. Both rates of the post-emergence herbicide, Cadre, were effective in controlling pigweed populations. High rates of the pre-emergence herbicide, Lexone DF, and the post-emergence herbicide, Cadre, were just as effective in maintaining pigeon pea populations and total DW as the hand-weeded plots. These results indicate that effective herbicide formulations are available for control of pigweed in pigeon pea production systems.