An apple replant disease (ARD) infested orchard site was replanted with five different apple rootstocks: the widely used Malling series, M.7 and M.26, and three breeds from the Cornell-Geneva series G.16, G.30 and CG.6210. The development of microbial rhizosphere community composition has been monitored for over 2 years. The bacterial rhizosphere community composition as assessed with PCR-DGGE did not differ between the rootstocks. However, plate counts for bacteria and fungi for the rootstocks M.7 and M.26 were higher than for the CG-rootstocks. The community composition changed in response to orchard planting position and within and between seasons.
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