http://orgprints.org/9449/ Field efficacy of new compounds to replace copper for scab control in organic apple production Heijne, B. de Jong, P.F. Lindhard Pedersen, H. Paaske, K. Bengtsson, M. Hockenhull, J. Crop health, quality, protection Efficacy of compounds was investigated in field experiments in Denmark and the Netherlands according to EPPO guidelines. Some Yucca extracts and potassium bicarbonate had an efficacy similar to sulphur on leaves. Addition of sulphur to Yucca 1 and to potassium bicarbonate increased the level of efficacy to that of copper. This confirms results from earlier years. Although a dose increase resulted in better efficacy, this was more prominent for Yucca1 than for potassium bicarbonate. 2007 Conference paper, poster, etc. NonPeerReviewed application/pdf http://orgprints.org/9449/1/heijne-etal-2007-scab-control_apple-production.pdf Heijne, B.; de Jong, P.F.; Lindhard Pedersen, H.; Paaske, K.; Bengtsson, M. and Hockenhull, J. (2007) Field efficacy of new compounds to replace copper for scab control in organic apple production. 3rd QLIF Congress: Improving Sustainability in Organic and Low Input Food Production Systems, University of Hohenheim, Germany, March 20-23, 2007. http://orgprints.org/9449/http://orgprints.org/9449/1/