Weibel, Franco P.; Chevillat, Véronique S.; Tschabold, Jean-Luc and Stadler, Walter (2006) Fruit thinning in organic apple growing with optimized timing and combinations strategies including (new) natural spray products and mechanical rope-divices. In: Fördergemeinschaft Ökologischer Obstbau e.V., FÖKO (Ed.) Proceeedings of the 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing, Weinsberg/Germany, Jan 31 - Feb 2 2006, FÖKO, Weinsberg, Germany, pp. 183-197.