Articles
EVALUATING APPLE REPLANT STRATEGIES IN THE SOUTHEASTERN UNITED STATES
Article number
1058_84
Pages
645 – 650
Language
English
Abstract
Apple replant disorders, which reduce orchard productivity, have been docu-mented.
However, strategies to mitigate these disorders may vary from region to region.
Two replicated studies were established in North Carolina to evaluate strategies for managing replant issues.
The first trial was established in 2005 in a replant site and is evaluating the effects of a pre-plant soil treatment (1,3-dichloro-propene + 35% chloropicrin) and rootstock selection on tree survival, trunk cross-sectional area (TCSA) and cropping.
Seven dwarf rootstocks (B.9, M.9T337, M.9 Pajam 2, M.26, G.935, G.11 and G.16) and three semi-dwarf rootstocks (M.7, G.30 and G.210) were included in the study.
Differences in trunk cross-sectional area (TCSA) among both the dwarf and semi-dwarf rootstocks were measured with the fumigation main effect being non-significant at the P≤0.05 level.
Significant rootstock differences were detected in the cumulative crop yield for the dwarf rootstocks, which did not occur in the semi-dwarf rootstocks.
In the semi-dwarf rootstocks there was a significant fumigation effect for 2012 yield and 2012 yield efficiency.
The second trial was established in 2007 in an Adams Apple red delicious commercial orchard evaluating the effect of three pre-plant soil treatments (dazomet, chloropicrin and 1,3-dichloropropene + 35% chloropicrin) and an untreated control on tree growth and productivity.
The treatments were applied in the fall of 2007 with planting in March 2008. Although early in the life of this study, numerical differences have been detected in tree growth as measured by TCSA and cumulative yield.
This manuscript will include completed data through the 2012 season.
However, strategies to mitigate these disorders may vary from region to region.
Two replicated studies were established in North Carolina to evaluate strategies for managing replant issues.
The first trial was established in 2005 in a replant site and is evaluating the effects of a pre-plant soil treatment (1,3-dichloro-propene + 35% chloropicrin) and rootstock selection on tree survival, trunk cross-sectional area (TCSA) and cropping.
Seven dwarf rootstocks (B.9, M.9T337, M.9 Pajam 2, M.26, G.935, G.11 and G.16) and three semi-dwarf rootstocks (M.7, G.30 and G.210) were included in the study.
Differences in trunk cross-sectional area (TCSA) among both the dwarf and semi-dwarf rootstocks were measured with the fumigation main effect being non-significant at the P≤0.05 level.
Significant rootstock differences were detected in the cumulative crop yield for the dwarf rootstocks, which did not occur in the semi-dwarf rootstocks.
In the semi-dwarf rootstocks there was a significant fumigation effect for 2012 yield and 2012 yield efficiency.
The second trial was established in 2007 in an Adams Apple red delicious commercial orchard evaluating the effect of three pre-plant soil treatments (dazomet, chloropicrin and 1,3-dichloropropene + 35% chloropicrin) and an untreated control on tree growth and productivity.
The treatments were applied in the fall of 2007 with planting in March 2008. Although early in the life of this study, numerical differences have been detected in tree growth as measured by TCSA and cumulative yield.
This manuscript will include completed data through the 2012 season.
Publication
Authors
M.L. Parker, T. Hoyt, B. Clark
Keywords
soil treatment, apple rootstocks, Malus domestica, trunk cross-sectional area, yield
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