Strategic irrigation against apple scab (Venturia inaequalis)

Publikation: Bidrag til bog/antologi/rapportKonferencebidrag i proceedingsForskning


In Denmark there are several organic orchards, that do not spray at all, and they seek non-spraying methods to prevent apple scab. In this pilot trial, irrigation with water at strategic moments was tested to prevent scab-infection. In April-June 2011 in five organic orchards we irrigated the orchard floor, to force the ascospores to be released. We irrigated with at least 0.2 mm of water in dry periods, at least 12 hours before rain forecast. The idea was to empty the stock of ascospores during dry spells, so they would dry out without infecting the leaves. To find the best strategic times for irrigation, we used the local weather forecast and the scab-warning programme Rimpro based on data from climate stations located in the orchards. In this first year of trial we experienced difficulties in spreading the water evenly. A water wagon turned out to work better than sprinklers. We found, that the irrigation did result in ascospore-release, but the effect on the scab-attack was not significant. We also experienced, that the fruit growers found this way of preventing scab very interesting and easy to carry out. The pilot-trial was financed by “Fonden for Oekologisk Jordbrug” and in 2011 it was conducted by the organic advisory-service. It is continued in 2012 and 2013 at the University of Copenhagen.
Titel15th International Conference on Organic Fruit-Growing : Proceedings to the Conference
Antal sider4
ForlagFoerdergemeinschaft Oekologischer Obstbau e.V. (FOEKO)
ISBN (Trykt)978-3-98 04883-6
StatusUdgivet - 2012
Begivenhed15th International Conference on Organic Fruit-Growing - Universität Hohenheim , Stuttgart, Tyskland
Varighed: 20 feb. 201222 feb. 2012


Konference15th International Conference on Organic Fruit-Growing
LokationUniversität Hohenheim

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