Scirtothrips dorsalis is known as a pest in mango. Strain C and YT of S. dorsalis coexisted on mango in Kagoshima Prefecture. We investigated the overwintering sites of S. dorsalis in mango under plastic house conditions. Strain YT caught by yellow sticky traps and ground traps were observed at a minimum level of activity for four months from November to late February, so they seemed to overwinter in mango. On the other hand, strain C was observed from a number of adults caught by the traps from October to November, after that they increased until spring. This result establishes strain C seemed to active in mango throughout autumn-winter. Strain C was also observed in flower buds of mango that were not caught by the yellow sticky traps. This result suggests that strain C propagated and emerged from buds throughout the autumn-winter.