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Twenty-one rice cultivars were evaluated to determine the difference between populations of Sogatodes oryzicola (Muir) (Homoptera: Delphacidae) in Costa Rica and Colombia. Survival, mortality and population development of S. oryzicola on five selected cultivars was used to determine levels of plant resistance. The importance and potential of the parasitoid-predator Haplogonatopus sp. (Hymenoptera: Dryinidae) on S. oryzicola also was studied. Minor differences were observed among cultivars: Inti, CICA 4 and IR 8, which were resistant in Colombia were intermediate in Costa Rica. Cultivars rated intermediate in Colombia, were rated the same in Costa Rica, except CR-1113 which was susceptible in two Costa Rica colonies. Susceptible ratings in cultivars coincided in both countries, except Tadukan which was resistant t