This study was conducted from 2004 to 2006 in La Yerba (Tepic) and Emiliano Zapata (Xalisco), Nayarit, Mexico. The objectives were: To know the thrips species associated to leaves and flowers, and to determine their population dynamics. The identified thrips species were: Family Aeolothripidae, Aeolothrips major Bailey, Erythrothrips durango Watson, and Franklinothrips vespiformis (D. L. Crawford). Family Phlaeothripidae, Pseudophilothrips perseae (Watson), and Leptothrips mcconelli (D. L. Crawford). Family Thripidae, Frankliniella minor Moultou. The predator species E. durango, F. vespiformis and L. mcconelli along with P. perseae, were recorded for the first time in avocado in Nayarit. In La Yerba, the highest thrips population was in June (2.09 thrips/leave), in E. Zapata this was in July (4.10 thrips/leave). Higher thrips population occurred during periods of high temperatures or during flowering, and vegetative growth, but not during rainfall period. As an average (both years), density of thrips was 60 % significantly higher in E. Zapata than in La Yerba, Nayarit.