Soria, S.J., Camargo, U.A., Fão, V.M., & Braghini, L.C. 1999 [Field assessment of varietal resistance of American vine rootstocks to the Brazilian ground pearl, Eurhizococcus brasiliensis (Hempel in Wille, 1922) (Homoptera: Margarodidae) in southern Brazil.]. VII Congresso Brasileiro de Viticultura e Enologia. Bento Gonçalves e Garibaldi Brasil 101 pp.

Notes: [Conference held 14 to 16 July, 1993. Original title: Avaliação no campo da resistência de videiras americanas à pérola-da-terra Eurhizococcus brasiliensis, Brasil.] E. brasiliensis is a severe pest of the root system of vineyards in southern Brazil. The objective of this work was to determine the level of varietal resistance of some Vitis sp. rootstocks of American origin to the above-mentioned pest. The method of assessment was by screening several varieties for survivorship under field conditions. The rootstocks were planted in a heavily infested field after being kept for one year in the greenhouse. The level of resistance was determined by counting the number of plants that survived for two years. It was suggested that the mechanism of resistance was through tolerance of the pest.