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Effects of Plastic Film as a Closure Method on Cultural Morphology of Fusarium Species. R. P. Kaiser, Graduate Student, Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802; Phytopathology 68:669-671. Accepted for publication 6 October 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-669.

Metal-capped test tubes containing cultures of Fusarium sp. were sealed with a plastic wrap to control mites. Fungal growth in these tubes was characterized by variation in colony morphology and color and slower growth compared with that of the same isolate in nonsealed test tubes. Variability in spore shape was increased and total spore production was reduced. The atmosphere in sealed test tubes containing cultures of Fusarium solani was significantly higher in CO2 and H2O and lower in O2 compared with the atmosphere in tubes not sealed with the plastic wrap.

Additional keywords: Fusarium solani, carbon dioxide, conidia.