everal fungal species are effective degraders of pectic substances, being able to produce high amounts of pecti- nolytic enzymes [1]. A novel strain of A. niveus was isolated from Brazilian soil, which produces high levels of several hydrolytic enzymes, such as xylanase [5, 6] and amylases [7, 8]. In this work, we demonstrated that this fungus also produced high polygalacturonase levels when grown on agricultural wastes, such as orange peel and passion fruit peel. This work leads to future biotechnological applications, and it also contributes to diminish the environmental pollution consequent of the accumulation of citric residues that are discarded in the environment.