1. Determine the population dynamics of sexually reproducing Aspergillus flavus under field conditions. 2. Identify genes in Aspergillus flavus responsible for virulence during the infection process and elucidate the role of fungal gene products for overcoming peanut resistance mechanisms. 3. Determine the role of defensive peanut phytoalexins in mediating natural crop resistance against Aspergillus flavus.