Effects of «Trichoderma» Treatments on the Occurrence of Decline Pathogens in the Roots and Rootstocks of Nursery Grapevines

Francois Halleen, Johann van der Vyver, Paul Fourie, Wouter Schreuder

Abstract


The growth-stimulating attributes of Trichoderma treatments (dips, soil amendments and drenches with
Trichoderma products containing propagules of selected strains of Trichoderma harzianum) in grapevine nurseries,
and their effect on the occurrence of fungi in roots and rootstocks of nursery grapevines, in particular fungi causing
Petri disease (Phaeomoniella chlamydospora and Phaeoacremonium spp.) and black foot rot (Cylindrocarpon spp.),
were compared with quintozene/procymidone treated (standard) vines. Early shoot growth of Trichoderma treated
vines was visibly better than that of the control vines. Eight months after planting, at uprooting, percentage take and
shoot mass of Trichoderma and standard treated vines were similar, but total root mass was significantly higher for
Trichoderma treated vines. Low percentages of Cylindrocarpon spp. were isolated from the rootstocks of treated and
untreated vines, while less Petri disease fungi were isolated from rootstocks of Trichoderma treated vines. Markedly
fewer fungi were also isolated from the roots of Trichoderma treated vines. Incidences of Petri disease fungi in roots
of Trichoderma and standard treated vines were similar, but fewer Cylindrocarpon spp. were isolated from Trichoderma
treated vines. These results indicate the potential of Trichoderma treatments in grapevine nurseries for the production
of stronger vines with lower Phaeomoniella/Phaeoacremonium and Cylindrocarpon infection levels.

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DOI: http://dx.doi.org/10.14601/Phytopathol_Mediterr-1619



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