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Tritrophic Relationships: Citrus varieties x Diaphorina citri Kuwayama, 1908 (Hemiptera: Psyllidae) x Tamarixia radiata (Waterson, 1922) (Hymenoptera: Eulophidae) This research‟s aim was to evaluate the influence of commercial citrus varieties and orange jessamine on the development of Diaphorina citri Kuwayama, 1908 and the parasitoid Tamarixia radiata (Waterson, 1922) preference on the Asian Citrus Psyllid (ACP), reared on different citrus varieties and on orange jessamine, by the means of biological and behavioral studies, in order to establish strategies of pest control in Integrated Pest Management (IPM) citrus programs. Free-choice and nochoice tests were carried out to evaluate the citrus varieties effects on the feeding and fertility of D. citri, as well as the biology of this psyllid species on different hosts. It was evaluated the citrus variety effect on the T. radiata parasitization, as well as its biology with D. citri reared on different hosts. It can be concluded that: D. citri preferred laying eggs and feeding, in free-choice tests, on „Natal‟, while in the nochoice test, the laying-eggs behavior was the same on „Natal‟, „Valência‟ and „Pêra‟. In the both tests, „Hamlin‟ was the least suitable for D. citri. According to the other biological characteristics evaluated, the grouping analysis identified 3 different groups, being „Valência‟ and orange jessamine the best hosts for D. citri development. In the second group („Natal‟, „Pêra‟ e „Ponkan‟) are the varieties that provided a reasonable development to the psyllid, being „Hamlin‟ the least suitable for the insect development. According to the fertility life table, the reproduction net rate (Ro) of D. citri was 2,5 times bigger if reared on „Valência‟ compared to „Hamlin‟. The other life table parameters (T, λ e rm) also supported the results when it was reared on „Valência‟. The studied hosts did not affect the parasitization and the development of T. radiata on D. citri. The results obtained will provide information for planting planning of citrus varieties in new groves considering the HLB incidence and management.

Relações tritróficas: Variedades de Citros x Diaphorina citri Kuwayama, 1908 (Hemiptera: Psyllidae) x Tamarixia radiata (Waterson, 1922) (Hymenoptera: Eulophidae)