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p-Fluorophenylalanine Selectively Inhibits Sporulation of Two Wilt Fungi. W. L. Biehn, Assistant Plant Pathologist, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504; Phytopathology 63:421-423. Accepted for publication 2 October 1972. DOI: 10.1094/Phyto-63-421.

The ED₉₀ of DL-p-fluorophenylalanine (FPA) for inhibiting sporulation of Ceratocystis ulmi in shake culture was about 5 µg/ml vs. an ED₉₀ for inhibiting total growth in shake culture and mycelial growth in still culture of >450 µg/ml. The ED₉₀ of FPA for inhibiting sporulation and mycelial growth of Fusarium oxysporum f. sp. lycopersici was about 30 and >200 µg/ml, respectively, after 43-hr incubation. In the presence of FPA in shake culture, growth of these fungi, especially C. ulmi, changed from sporulation to mycelial.