Bacterial interference with in vitro assays of tall fescue seeds for Acremonium coenophialum

In vitro embryo-derived callus culture is an efficient and useful technique for determining viable fungal endophyte (Acremonium coenophialum Morgan-Jones & Gams) level in tall fescue (Festuca arundinacea Schreb.) seed lots; however, the presence of a yellow-pigmented bacterium occasionally interferes with detection of the fungus