The objective of this work was to evaluate the effect on citrus (Citrus spp.) rootstocks to Phytophthora parasitica by in vitro inoculation. Seedlings were cultivated in MS media for 40 days, under 18 h of light of photoperiod and at 25 ºC. Inoculation was performed by injecting an infested needle into seedling collars. Evaluation was made by the length of lesions in centimeters. The experimental design was random with 15 replicates of each genotype. Results indicate good correlation between in vitro and orchard reactions genotypes to P. parasitica.
