This study aimed to evaluate the occurrence of ground pearl (Eurhizococchus brasiliensis), as well as the vegetative growth and the phenology of 'Isabel', 'Bordô' (Vitis labrusca L.), 'Cabernet Sauvignon', 'Malbec' and 'Merlot' grapes (Vitis vinifera L.) grafted on the rootstocks 'Paulsen 1103' and 'VR 043-43 '. The experiment was carried out at the experimental area of Agronomy Department of Universidade do Centro-Oeste (Unicentro), in Guarapuava, PR, Brazil during the 2010/2011 crop season. The statistical design was randomized blocks in factorial 5 x 2 (cultivar x rootstock), with 10 treatments, five repetitions and three plants per plot. Each block consisted of a plant line. The evaluations were: shoot fresh (SFM) and dry (SDM) mass of material from the production pruning. After harvest, the grapevines were removed from the soil and then the number of ground pearl per plant (GPP), the root fresh (RFM) and dry (RDM) mass, the stem fresh (SFM) and dry (SDM) mass were evaluated. In addition, the duration of the phenological stages was evaluated, according to Eichhorn and Lorenz (1984). It was verified that the vines grafted on 'VR 043-43' had a lower number of cysts of ground pearl, but this factor had a positive effect only on the vegetative development of American cultivars. For the other variables analyzed there was no influence of the rootstock.
Grapevine; Eurhizococchus brasiliensis; organic
