Abstract
AbstractConidia of Fusarium oxysporum on membrane filters on a sand bed saturated with a TRIS‐buffer in Conway vessels were exposed to different concentrations of NH3. NH3 was generated by bubbling air through NH4OH‐containing cylinders and pumped through the Conway vessels. Low concentrations of NH3 (15 ppm) stimulated chlamydospore formation in both germinated and ungerminated conidia. Higher concentrations of NH3 (150 ppm) inhibited chlamydospore formation. Ammonia had no apparent effects on the quality of the produced chlamydospores as measured by determining the persistence in soil.
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