'Clapp's Favorite' as interstock on Pyrus calleryana rootstock increases 'Packham's Triumph' fruit weight
Pear is the main imported fresh fruit in Brazil, but this country has potential to be a prominent producer in pear trees, mainly in its southern region. Deficiencies found for this fruit crop are the insufficient studies on rootstocks and adaptability of canopy cultivars for this region where favorable soil and climatic conditions are found. This study evaluated agronomic performance of European pear tree cultivars in southern Brazil in the 2016/2017 season, in CAV-UDESC, Santa Catarina State. Training system was central leader, spacing 3.5 m between rows and 1.5 m between plants. Orchard implantation was in 2013 with cultivars Packhams Triumph and Williams grafted on Pyrus calleryana rootstock with and without Clapps Favorite interstock. Analyzed variables were: plant height, stem cross-sectional area, internode length, fruit diameter and weight, soluble solids and pulp firmness. There was no effect of cultivars or interstock in plant height, internode length and pulp firmness. Agronomic performance of Packhams Triumph and Williams on Pyrus calleryana rootstock was influenced by the presence of interstock as seen by differences in trunk cross section area, fruit diameter and weight, and also in soluble solids content. Trunk cross section area and soluble solids content were larger in Williams cultivar without interstock. Fruit diameter was larger in Packhams with interstock. Fruit weight increased in Packhams with and in Williams without interstock.
Santos da Silva, P., Welter, J.F., Posser, A.J., Fagherazzi, M.M., Fagherazzi, A.F. and Rufato, L. (2021). 'Clapp's Favorite' as interstock on Pyrus calleryana rootstock increases 'Packham's Triumph' fruit weight. Acta Hortic. 1303, 215-220
agronomic performance, fruit quality, 'Williams', tree growth