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Title:   Author  item
                                            Browne, Gregitem
                                            TROUT, T - UC DAVIS PLANT PATHitem
                                            Becherer, Harolditem
                                            MCLAUGHLIN, S - UC DAVIS PLANT PATHitem
                                            LEE, R - UC DAVIS PLANT PATHitem
                                            GARTUNG, J - UC DAVIS PLANT PATHitem
                                            GILLIS, M - UC DAVIS PLANT PATHitem
                                            SCHNEIDER, S - UC DAVIS PLANT PATHitem
                                            BULLOCK, R - UC DAVIS PLANT PATH
  Submitted to: Proceedings of Methyl Bromide Alternatives Conference
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 6/1/2003
                                    Publication  Date: 7/1/2003
                                    Citation: Browne, G.T., Trout, T., Becherer, H.E., Mclaughlin, S., Lee, R., Gartung, J., Gillis, M., Schneider, S., Bullock, R. 2003. Pre-plant cropping and fallowing effects on severity of prunus replant disease. Proceedings of Methyl Bromide Alternatives Conference.Interpretive Summary: Almond, peach, and other commercially cultivated Prunus species are subject to replant disease (RD) when planted without precautions at orchard sites previously devoted to a closely related crop.  We determined effects of short-term fallow and cover crop treatments as well as long-term cropping history on severity of RD on Nemaguard peach.  In a 2003 experiment in field microplots, Nemaguard peach seedlings planted without pre-plant fumigation after removal of the almond trees on Nemaguard peach rootstock grew significantly less than those planted after pre-plant fumigation, or after culture with wheat cultivar Penewawa, or after culture with sudan grass or sudan grass followed by wheat; pre-plant fallowing without fumigation did not improve seedling growth.  These results indicated that certain short-term crop rotations may be used to help prevent replant disease on Nemaguard peach rootstock.  In long-term cropping / cross specificity tests in the greenhouse, relatively high percentages of root cortex necrosis occurred on grape and peach root systems grown in non-fumigated soil from grape and peach sites, respectively.  Comparatively less root damage occurred on peach when it was grown in non-fumigated grape soil.  Grape cuttings sustained moderate root damage in non-fumigated peach as well as non-fumigated grape soil, but severity of the damage was slightly less in peach than in grape soil.  Repeat experiments in a field setting are needed to conclusively test effects of crop specificity and long-term cropping history on Prunus RD.
                                Technical Abstract: Almond, peach, and other commercially cultivated Prunus species are subject to replant disease (RD) when planted without precautions at orchard sites previously devoted to a closely related crop.  We determined effects of short-term fallow and cover crop treatments as well as long-term cropping history on severity of RD on Nemaguard peach.  In a 2003 experiment in field microplots, Nemaguard peach seedlings planted without pre-plant fumigation after removal of the almond trees on Nemaguard peach rootstock grew significantly less than those planted after pre-plant fumigation, or after culture with wheat cultivar Penewawa, or after culture with sudan grass or sudan grass followed by wheat; pre-plant fallowing without fumigation did not improve seedling growth.  These results indicated that certain short-term crop rotations may be used to help prevent replant disease on Nemaguard peach rootstock.  In long-term cropping / cross specificity tests in the greenhouse, relatively high percentages of root cortex necrosis occurred on grape and peach root systems grown in non-fumigated soil from grape and peach sites, respectively.  Comparatively less root damage occurred on peach when it was grown in non-fumigated grape soil.  Grape cuttings sustained moderate root damage in non-fumigated peach as well as non-fumigated grape soil, but severity of the damage was slightly less in peach than in grape soil.  Repeat experiments in a field setting are needed to conclusively test effects of crop specificity and long-term cropping history on Prunus RD.


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