Collins, A. A.
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Penn State Univ, Dept Plant Pathol & Environm Microbiol, University Pk, PA 16802 USA
Penn State Univ, Southeast Agr Res & Extens Ctr, Manheim, PA 17545 USA Penn State Univ, Dept Plant Pathol & Environm Microbiol, University Pk, PA 16802 USA