文献类型： 会议论文

第一作者： M. Korsgaard

作者： M. Korsgaard ¹ ;

作者机构： 1.University of Copenhagen, Faculty of Science, Department of Plant and Environmental Sciences, Hoej-bakkegaard Alle 13, DK-2630 Taastrup, Denmark

关键词： Venturia inaequalis;non-spraying;irrigation;prevention;organic apple production

会议名称： International Conference on Organic Fruit-Growing

主办单位：

页码： 52-58

摘要： Several Danish organic orchards seek methods to prevent apple scab without spraying. In the years 2011-2013 a new strategy was tested: Irrigation with water at strategic moments to prevent scab infection.In the period from late April to late June 2011 and 2012, five organic orchards were irrigating the orchard floor to elicit the release of ascospores. The irrigation took place in dry periods 12 to 24 hours before rain forecast.The goal was to empty the stock of ripe ascospores during dry spells, leaving them on the dry leaves to dry out, subsequently causing no infection. The best strategic moments for irrigation, was defined by using the local weather forecast and the scab-warning programme Rimpro based on data from climate stations located in the orchards. The experiments showed that irrigation can cause the release of ascospores. In one orchard in 2012 the effect on the scab-attack was significant. Irrigation five times during spring reduced the percentage of apple scab from 47% to 12% in the apple cultivar 'Rubens'. This significant result was achieved in an orchard using both the strategic irrigation and preventive sprays with sulphur. In totally unsprayed orchards there was no significant effect of the strategic irrigation.Closer studies of the ascospores took place at the University of Copenhagen in 2012 and 2013. The ascospore reaction to amount of water, water quality, drop size and the sound of rain was studied.The pilot-trial was financed by "The foundation for Organic Agriculture" in 2011 and 2012. In 2012 and 2013 the investigations continued at the University of Copenhagen, financed by the Ministry of Food, Agriculture and Fisheries of Denmark.

分类号： s66-532