Comparison of Rootstocks Geneva 16, M9 and CG11 under organic cultivation at the LVWO Weinsberg 2009-2013

摘要

A comparison of the cultivar 'GoldRush' grafted on the rootstocks Geneva 16 (weaker than M9), M9 (as standard) and Geneva CG11 (stronger than M9) is going on in the organically cultivated part Q 624 of the LVWO Weinsberg since February 2008. Data wereevaluated about growth of the stem, flower setting, fruit-setting, effort for thinning by hand, yield, colour- and size-sorting. Over five years the rootstock Geneva 11 had a positive effect on the yield, size and colour of the fruits, the yield was slightly more balanced (better relation growthiyield). 2013 was the first year, when differences were seen at russeting, trees on CG16 had about 10 % more apples with middle russeting. Breakdown of scab-resistance has been watched in the organic orchard ofthe LVWO Weinsberg since 2008, 2013 was a year with an extreme infection level of Venturia inaequalis. Sprayed with the same organic scab-strategy, the trees onCG11 had some more scab-infections on the leaves and on the fruits in 2013 because of strongergrowth, so additional evaluations were done about the infestation level of scab and sooty blotch.