ISHS Acta Horticulturae 233: Workshop on Replant Problems with Fruit Trees
THE ROLE OF FUNGI, BACTERIA, AND THEIR INTERACTIONS IN APPLE REPLANT DISEASE COMPLEX IN SOILS OF BRITISH COLUMBIA |
| Authors: | R.S. Utkhede, T.S.C. Li |
| Abstract:
Seventy seven fungi and 26 bacteria were isolated from orchard soil in British Columbia known to have apple replant disease (ARD). Two isolates of Pennicillium janthinellum, and one isolate each of Costantinella terrestris and Trichoderma sp individually stunted the growth of McIntosh apple seedlings while their combinations had variable responses. Interactions of fungi in orchard soils may also be contributing to ARD. In addition, two isolates of Bacillus subtilis (B1 and B2) significantly reduced apple seedling height by 68 and 70%, respectively. B5, B10, B21 and B25 isolates grown on potato dextrose agar showed antagonism against 60 of the fungi isolated from ARD soils. But under greenhouse conditions none of these antagonists improved apple seedling growth in soils amended with four ARD fungi. These results suggest that fungi, bacteria and their interactions may be involved in ARD complex in British Columbia. | |
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