Peach Tree Short Life in Rio Grande do Sul State, Brazil
The Peach Tree Short Life (PTSL) is a syndrome that causes severe damage to peach trees, usually between one and eight-years-old, which can lead to the scion death. In Brazil, it has importance mainly in the Rio Grande do Sul State, which is the largest Brazilian peach producer. First reported in the Pelotas area, in late 1970s, the syndrome continues to cause damage, with varying intensities among years. Several causes have been reported in national and international literature, involving biotic and abiotic factors. In Rio Grande do Sul, due to the predominant use of mixtures of scion peach pits from canning industry for rootstock production, it is not possible to know varietal identity of tree root system in commercial orchards. This genetic variability which causes heterogeneity among trees, can at the same time under the environmental selection pressure, be used in a clonal selection program in situ, in search for tolerant sources. In another strategy developed by Embrapa Clima Temperado, evaluation of cultivars, species and interspecific hybrids as rootstocks are also underway. In the present paper, we report main technical and scientific advances on PTSL in Rio Grande do Sul and the focus on search for tolerant rootstocks and quality of nursery trees.
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