Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 499093
Title Twenty-four years of Dutch Trig® application to control Dutch elm disease
Author(s) Postma, Joeke; Goossen-van de Geijn, Helen
Source BioControl (2016). - ISSN 1386-6141 - p. 305 - 312.
DOI http://dx.doi.org/10.1007/s10526-016-9731-6
Department(s) PRI Bioint Entomology & Disease Management
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Biological control agent - Commercial application - Induced resistance - Verticillium albo-atrum
Abstract

Since 1992 elm trees have been treated with a biological control product Dutch Trig® to protect them from infection by Ophiostoma novo-ulmi causing Dutch elm disease (DED). The active ingredient of the biocontrol product consists of the fungus Verticillium albo-atrum strain WCS850. A conidiospore suspension of this fungus is injected into the vascular system of elm trees at a height of 1.3 m. This biocontrol product prevents healthy elm trees from fungal infection transmitted by elm bark beetles. Dutch Trig®, however, does not protect already infected trees or trees connected with diseased trees via root grafts. Since 2010, only 0.1 % of the injected elms became infected with DED through beetle transmission and an additional 0.4 % of the treated elms were infected through root contact in the Netherlands. Regression analysis considering all injected elm trees in the Netherlands since 1992 indicated that DED infection through beetle transmission had significantly decreased during the 24 years application of Dutch Trig®. In 2015, approximately 28,300 trees in five countries (Netherlands, USA, Germany, Canada and Sweden) were treated with Dutch Trig® to protect valuable susceptible elm trees, mainly in urban environments.

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