Effect of fungicides on epiphytic yeasts associated with strawberry

Jane Debode, Wendy Van Hemelrijck, Piet Creemers, Martine Maes

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    We studied the effect of two commonly used fungicides on the epiphytic yeast
    community of strawberry. Greenhouse and field experiments were conducted
    applying Switch (cyprodinil plus fludioxonil) or Signum (boscalid plus pyraclostrobin) to strawberry plants. Yeasts on leaves and fruits were assessed on
    treated and untreated plants at several time points via plating and denaturing
    gradient gel electrophoresis (DGGE) analysis. The yeast counts on plates of the
    treated plants were similar to the control plants. Unripe fruits had 10 times
    larger yeast concentrations than ripe fruits or leaves. Some dominant yeast
    types were isolated and in vitro tests showed that they were at least 10 times
    less sensitive to Switch and Signum as compared with two important fungal
    strawberry pathogens Botrytis cinerea and Colletotrichum acutatum, which are
    the targets for the fungicide control. DGGE analysis showed that the applied
    fungicides had no effect on the composition of the yeast communities, while
    the growing system, strawberry tissue, and sampling time did affect the yeast
    communities. The yeast species most commonly identified were Cryptococcus,
    Rhodotorula, and Sporobolomyces. These results point toward the potential
    applicability of natural occurring yeast antagonists into an integrated disease
    control strategy for strawberry diseases.
    TaalEngels
    TijdschriftMicrobiologyOpen
    Volume3
    Exemplaarnummer2
    Pagina's (van-tot)482-491
    Aantal pagina's10
    StatusGepubliceerd - jun-2013

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