The aim of this master thesis was to investigate various thinning methods that may be of relevance in organic farming. Important questions, additionally to the thinning effect, were the impact on fruit size, fruit quality and crop health. Both, mechanical and sprayed variants were tested. The mechanical variants included the Effleureuse, hand thinning (removing young cherries by hand) and a manual flower thinning. The applied sprayed variants included wettable sulfur (4%), lime sulfur (3%), whey (5%), vinasse (6%), potassium soap (Neudosan 6%) and copper (Cuprofor 0,5 %) as well as ATS (1,8%) as IP- standard. The mechanical variants were carried out once, the sprayed variants twice between flowering and full flowering, only the hand thinning at the fruit stage of pea size. Furthermore, vegetative parameters, generative parameter and internal fruit quality parameters were observed. The results revealed that in some variants a thinning effect was observed. The best results were achieved by the Effleureuse where the thinning effect was associated with an increase in fruit size. The sprayments with lime sulfur, wettable sulfur and copper showed also a good effect on Monilinia laxa. Internal fruit quality parameters were indifferent to the variants used.