In grapevine propagation with cuttings in containers it is important to avoid damages to root system during transplanting to the field. The aim of this research was to determine, by means of root system evaluation, the best period to transplant 'IAC 766' (Campinas) rootstock. The trial was set up in July 2004 in Marialva County (PR). The plants were evaluated 60, 90, 120, 150 and 180 days after the establishment of woody cutting in plastic bags of 20cm wide and 30cm high. The roots were exposed and pictures were taken in lateral and top positions and were evaluated by SIARCS 3.0 software, with determination of the area and the length of the root system. To evaluate the conformation of the root system it was used an architecture diagram attributing scores and counting the number of roots with distortion. The experiment had a randomized complete-block design with ten-plant plots, five treatments and five replications. All characteristics, with exception of the root architecture scores, fitted in a linear crescent regression. The best period for transplanting 'IAC 766' rootstock is around 90 days after the establishment of the cuttings.
cutting; Vitis; container; propagation; root system
