Submitted to: Journal of Pesticide Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/21/2005
Publication Date: 1/26/2006
Citation: Arai, K., Hirase, K., Moriyasu, K., Molin, W.T. 2006. Effect of 4-ethyl-3-(3fluorophenyl)-1-(3-trifluoromethylphenyl) pyrrolidin-2-one on the control of graminaceous and broad-leaf weeds in cotton. Journal of Pesticide Science, 31(1), 29-34. Interpretive Summary: The effects of a new phytoene desaturase inhibitor herbicide, MT 141, were evaluated on weeds of cotton to determine its efficacy and potential as a herbicide. This research was performed at the SWSRU farm in Stoneville, MS, from 2000 to 2002, and thereafter at Mitsui Chemicals, Chiba, Japan. The results show that MT 141 has sufficient efficacy against important weeds as well as safety in cotton to warrant consideration for further development. MT 141 also had good additive activity with glyphosate, and could be used to extend the herbicide range of glyphosate based products, which could benefit farmers by providing alternative weed control programs for difficult to control weeds.
Technical Abstract: The herbicide activity of diphenylpyrrolidinone, MT-141 [4-ethyl-3-(3-fluorophenyl)-1-(3-trifluoromethylphenyl) pyrrolidin-2-one] was examined in the greenhouse. MT-141 controlled barnyardgrass (Echinochloa crus-galli), johnsongrass (Sorghum halepense), green foxtail (Setaria virdis), large crabgrass (Digitaria sanguinalis), fall panicum (Panicum dichotomiflorum), goosegrass (Eleusine indica) and broadleaf signalgrass (Brachiaria platphylla) at 300 g a.i./ha following pre-emergence application (PRE). It also provided greater than 90% control of these weeds at 500 g a.i./ha following post-emergence application (POST). The herbicidal activity of MT-141 was less effective against broad-leaf weeds such as velvetleaf (Abutilon theophrasti) and morningglory (Ipomoea hederacea), but hemp sesbania (Sesbania exaltata) and prickly sida (Sida spinosa) were susceptible to MT-141 POST. MT-141 PRE and 500 g a.i./ha did not injure cotton for at least 5 wk. The most significant herbicidal symptom for this compound was chlorophyll bleaching. MT-141 PRE provided control of barnyardgrass and johnsongrass for 5 weeks. Planting depth and soil type did not affect the herbicidal activity of MT-141 on these weeds at 300 g a.i./ha. MT-141 PRE increased the herbicidal activity of glyphosate against hemp sesbania and morningglory without causing injury to glyphosate-resistant cotton. Also, several surfactants increased the herbicidal efficacy of this compound when applied POST. These results indicate that MT-141 has commercial potential as a PRE or POST herbicide.