The interaction between a fungal seed pathogen (Pyrenophora semeniperda) and a deleterious rhizobacterium (Pseudomonas fluorescens strain D7) and its potential use as a biological control for cheatgrass were explored in a series of three greenhouse studies. The first experiment was conducted to determine if P. fluorescens D7 enhances the fungal caused seed mortality caused by P. semeniperda in the spring. The second experiment was conducted to determine their interaction in the fall; if P. semeniperda enhances the effect of P. fluorescens D7 at the germination stage. The third experiment was conducted to determine if P. semeniperda enhances the effect of P. fluorescens D7 at the seedling stage, as opposed to the second experiment which was conducted at the germination stage.
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