Materials and methods
2.1. Experiment 1. Effect of glyphosate on M. phaseolina growth
in vitro
Thetreatmentsincludedsixlevelsofconcentrationsof0
e
20mM
of technical grade glyphosate acid (
>
97% purity, Sigma
e
Aldrich, St.
Louis, MO) and twenty one levels of concentrations of 0
e
90 mM of
the glyphosate-potassium salt formulation (48.8% glyphosate, N-
(phosphonomethyl) glycine and 51.2% of other ingredients, Mon-
santo, St. Louis, MO).