TITLE:
Interaction of a Myrothecium verrucaria Mycelial Preparation and a Glyphosate Product for Controlling Redvine (Brunnichia ovata) and Trumpet Creeper (Campsis radicans)
AUTHORS:
Clyde Douglas Boyette, Robert E. Hoagland, Charles T. Bryson, Mark A. Weaver, Kenneth C. Stetina
KEYWORDS:
Bioherbicide, Interaction, Mycelial Formulation, Myrothecium verrucaria, Campsis radicans, Brunnichia ovata
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.11 No.2,
February
21,
2020
ABSTRACT: A mycelial formulation of the bioherbicidal fungus Myrothecium verrucaria (Alb. & Schwein.)
Ditmar: Fr.
(MV) was tested alone and in combination with a commercially available
glyphosate [N-(phosphonomethyl)glycine]
(GLY) product for controlling the invasive vines, redvine [Brunnichia ovata (Walt.) Shinners], and trumpet creeper [Campsis radicans (L.) Seem. ex
Bureau] in field experiments conducted near Stoneville, MS. Several application
timing regimens were evaluated (Fall, Spring, Fall + Spring, and Spring +
Fall). We found that a Fall + Spring application of MV + GLY controlled redvine and trumpet creeper by 95%, 12 days
after the second treatment, through a synergistic interaction of the fungus and
glyphosate. Disease symptomatology was characterized by rapid necrosis of leaf
and stem tissues, with mortality occurring within 72 h. Neither glyphosate
alone, nor MV alone, effectively controlled either weed species under any
application timing regimen. No visual disease
or herbicide damage occurred on glyphosate-resistant
soybean plants in the treated test plots. These results suggest that some
formulations of glyphosate, mixed with the bioherbicide MV, can effectively
control redvine and trumpet creeper, two
of the most troublesome weeds in the row crops of the Mississippi Delta region
in the mid-southern U.S.