Results of the dual culture experiments showed that none of the
isolates tested was able to completely inhibit mycelial growth of A.
tubingensis. In the control treatment A. tubingensis colonized the
entire plates after incubation at 25 C for 7 days (data not shown).
In the dual culture treatments formation of inhibitory zones
between colonies of yeasts and A. tubingensis was not observed
after incubation for 7 days. However, 33 yeasts isolates, representing
60% of the analyzed population, inhibited the sporulation of A.
tubingensis. Although the fungal growth was not fully inhibited by
the yeasts, in some treatments the mycelium growth was confined
compared to the control plates and a zone with spore production
inhibition was evident between the yeasts and the fungus
(Fig. 1). Among the seven species identified, all H. uvarum, R.
mucilaginosa and P. aphidis isolates failed to induce antisporulant
activity on A. tubingensis. After incubation for 9 days, A. tubingensis
grew over the yeasts and colonized the entire surface of the medium
in each dual culture plate. The two C. zeylanoides (2AM6 and
2BM3) and the two C. sake (2AM3 and 2BM2) isolates were active
against A. tubingensis sporulation, whereas two C. magnus isolates
(XM19 and 2ZK2) out of nine isolates (22%) induced a spore inhibition
zone. A high number of A. pullulans isolates, namely 27 out of
the 37 identified (73%), inhibited to various degrees fungal sporulation
(Table 2).