Articles
Prunus rootstock testing for peach tolerance to Pseudomonas and Armillaria diseases in South Carolina
Article number
1242_50
Pages
357 – 362
Language
English
Abstract
New commercial rootstocks for peach include P. persica seedlings as well as many Prunus interspecific hybrids and plum species.
However, no rootstock has been successful in replant infected soils that have the Peach Tree Short Life Syndrome (PTSL) that includes both Pseudomonas syringae canker disease and Armillaria spp. root rot.
Four rootstock trials consisting anywhere from 5 to 16 out of 18 total rootstocks were budded with 4 scion cultivars, Flameprince, Crimson Lady, Julyprince and Fireprince and planted in 2012, 2013, 2013, 2015, respectively, in either Edgefield or Oconee Counties in South Carolina, USA. Tree death from bacterial canker (P. syringae) occurred in all sites planted before 2015. Trees on the hybrid or plum species rootstocks except MP-29 had the highest mortality. P. munsoniana selections 1, 2, 3, and 4 had tree death of (24-63%) from either incompatibility or bacterial canker in the 2012 test.
Trees on these rootstocks were also ~40 to 50% smaller than the controls after 4 years.
Hybrid rootstocks Replantpac, Tempropac, Densipac and Purplepac had PTSL-related mortality of 50, 63, 67, and 33%, respectively for the 2013 Crimson Lady planting.
Several Julyprince trees on Densipac and Tempropac rootstocks have also died from PTSL. The plum hybrid MP-29 had a high survival and semi-dwarfing effect (~50% standard) on the 2 test sites in which it was planted in 2013. Lovell and Guardian® have had minimal PTSL death from bacterial canker but Armillaria has started to kill trees in the 2012 planting site.
Another 3-5 years will be necessary to determine Armillaria tolerance, but the new rootstocks appear to have less resistance to bacterial canker than their commercial standard counterparts.
However, no rootstock has been successful in replant infected soils that have the Peach Tree Short Life Syndrome (PTSL) that includes both Pseudomonas syringae canker disease and Armillaria spp. root rot.
Four rootstock trials consisting anywhere from 5 to 16 out of 18 total rootstocks were budded with 4 scion cultivars, Flameprince, Crimson Lady, Julyprince and Fireprince and planted in 2012, 2013, 2013, 2015, respectively, in either Edgefield or Oconee Counties in South Carolina, USA. Tree death from bacterial canker (P. syringae) occurred in all sites planted before 2015. Trees on the hybrid or plum species rootstocks except MP-29 had the highest mortality. P. munsoniana selections 1, 2, 3, and 4 had tree death of (24-63%) from either incompatibility or bacterial canker in the 2012 test.
Trees on these rootstocks were also ~40 to 50% smaller than the controls after 4 years.
Hybrid rootstocks Replantpac, Tempropac, Densipac and Purplepac had PTSL-related mortality of 50, 63, 67, and 33%, respectively for the 2013 Crimson Lady planting.
Several Julyprince trees on Densipac and Tempropac rootstocks have also died from PTSL. The plum hybrid MP-29 had a high survival and semi-dwarfing effect (~50% standard) on the 2 test sites in which it was planted in 2013. Lovell and Guardian® have had minimal PTSL death from bacterial canker but Armillaria has started to kill trees in the 2012 planting site.
Another 3-5 years will be necessary to determine Armillaria tolerance, but the new rootstocks appear to have less resistance to bacterial canker than their commercial standard counterparts.
Authors
G.L. Reighard, W.G. Henderson, D.R. Ouellette
Keywords
Prunus persica, interspecific hybrids, peach tree short life, bacterial canker
Groups involved
- Division Temperate Tree Nuts
- Division Temperate Tree Fruits
- Division Vine and Berry Fruits
- Division Tropical and Subtropical Fruit and Nuts
- Division Ornamental Plants
- Division Vegetables, Roots and Tubers
- Division Precision Horticulture and Engineering
- Division Plant Genetic Resources, Breeding and Biotechnology
- Division Sustaining Horticulture in a Changing World
- Division Plant-Environment Interactions in Field Systems
- Division Postharvest and Quality Assurance
- Division Greenhouse and Indoor Production Horticulture
- Division Landscape and Urban Horticulture
- Division Horticulture for Human Health
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