The lack of studies on compatibility of pear cultivars and rootstocks is one of the limiting factors on the development of the pear crop in Brazil. The use of quinces as rootstocks for pear cultivars has several advantages, among them the reduction in vigor and earlier bearing trees, however, its combination with some scions cultivars results in problems of incompatibility , such as lost of trees of the orchard due to break of the graft union. The objective of this study was to determine the compatibility between pears cvs. Packham's Triumph and Kieffer on the rootstocks Quince Adam's and Quince C. The evaluated variables were: the section of trunk diameter at the graft union, and 5cm above and 5cm under the graft union; the diameter difference between scion and rootstock; plant height; volume and dry mass of canopy and roots. Moreover, it was observed the vascular connection of the graft union by immersion of the base of the plants (under the graft union) in a 0.08% Fuccinic acid solution. It was observed that the pear cv. Packham's Triumph is compatible with the Quince rootstocks cvs. Adams and Quince C, whereas the pear cv. Kieffer had morphological incompatibility symptoms with the Quince cvs Adams and Quince C.
vascular connection; Pyrus sp; Cydonia oblonga
