Soil Fungistasis: Role of Volatile Inhibitors in Two Soils

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Abstract
Volatile inhibitors were detected in Conover loam and sandy loam soils by incubating spores on double layer cellophane over, but separated from, soil in a Petri dish. Spores of Exserohilum rostratum and Alternaria solani which were not inhibited by the volatile inhibitors did not germinate in soils. Three other inhibitor-sensitive fungi were not affected by the amount of volatile inhibitors emanated from 0.5 g of soils, but they failed to germinate when incubated in that amount of soil. Attempts to remove volatile inhibitors from soils by aeration did not increase spore germination. Results suggested that volatile inhibitors from these soils were of secondary importance and superimposed upon fungistasis caused mainly by nutrient deprivation.
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