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The study was conducted in 2013 and 2014, at Xmatkuil Merida, Yucatan, Mexico to survey natural enemies and their effects on the population dynamics of Leucaena leucocephala (Lam.) de Wit pests: Leucaena Psyllids, Heteropsylla cubana, Crawford (1914) (Homoptera: Psyllidae) and Onion Thrips, Thrips tabaci, Lindeman (1889) (Thysanoptera: Thripidae) on four Leucaena genotypes: Cunningham, K636, Nativa and KX2. The juvenile leaves were collected, examined and the natural enemy's counts were correlated with each pest numbers. Nine predators related to 5 orders, and one parasitoid controlled the populations of both pests. In the first season Nativa had the largest densities of Psyllid, and Cunningham for Thrips. In the second season, Nativa for both pests. The least numbers recorded in KX2 for both pests. The coefficient of correlation (r) was stronger between natural enemies and H. cubana than T. tabaci. In the first season three peaks of Psyllid were occurred, two before the first harvest during May and June and one after at December. Otherwise, four peaks of Thrips were recorded on Cunningham, Nativa, and K636 during May to Aug. and only two occurred on KX2 at May and June. In the second season the largest population of pests was recorded in Nativa, and the lowest were in KX2 for both pests (r) was negative

Evaluar los enemigos naturales de Leucaena Psyllid y Onion Thrips en los procesos de cosecha en diferentes genotipos de Leucaena