Submitted to: Weed Biology and Management
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 27, 2007
Publication Date: March 13, 2008
Citation: Boyette, C.D., Hoagland, R.E., Weaver, M.A., Reddy, K.N. 2008. Redvine (Brunnichia ovata) and Trumpetcreeper (Campsis radicans) Controlled Under Field Conditions by a Synergistic Interaction of the Bioherbicide Myrothecium verrucaria and Glyphosate. Weed Biology and Management 8:39-45. Interpretive Summary: Redvine and trumpetcreeper are troublesome, viney weeds found throughout the Mississippi Delta. The native bioherbicidal fungus, Myrothecium verrucaria, was tested in a naturally infested field site alone, in combination with, prior to, and following treatment with the herbicide glyphosate product ‘Touchdown™’ at recommended usage rates for control of these weeds. We found synergistic interaction occurred between the herbicide and the fungus when tank mixtures were applied to weeds. These results suggest that mixtures of M. verrucaria and some glyphosate products can greatly improve the control of redvine and trumpetcreeper.
Technical Abstract: In field experiments conducted near Stoneville, MS in 2000 and 2001, the bioherbicidal fungus Myrothecium verrucaria (Alb. & Schwein.) Ditmar:Fr. was tested alone and in combination with a glyphosate [N-(phosphonomethyl)glycine] product for controlling natural infestations of the invasive vines, redvine (Brunnichia ovata [Walt.] Shinners), and trumpetcreeper (Campsis radicans (L.) Seem. ex Bureau). Redvine and trumpetcreeper were controlled 88% and 90%, respectively after 12 days through a synergistic interaction between the fungus and the herbicide. Disease symptomatology was characterized by rapid necrosis of leaf and stem tissues, with mortality occurring within 72 h. Neither glyphosate alone, nor M. verrucaria alone, effectively controlled either weed species. No visual disease or herbicide damage occurred on soybeans planted in treated test plots. These results suggest that some formulations of glyphosate, mixed with M. verrucaria, can effectively control redvine and trumpetcreeper.