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Resistance of citrus genotypes to the Citrus leafminer Phyllocnistis citrella Stainton, 1856 (Lepidoptera: Gracillariidae) The objective this study was to evaluate the effect of different cultivars, hybrids and genera related to Citrus on behavior and biology of the citrus leafminer (CLM), Phyllocnistis citrella. The effect of the host plant on feeding (nutritional) and oviposition behavior, and/or the biology of CLM was assessed to find resistant or tolerant genotypes.The insects were maintained in laboratory in cages. Lemon (Citrus limonia L. Osbeck) ‘Cravo’ seedlings were used as host plant. Initially, 23 genotypes of citrus were screened by exposing the seedlings of these plants to adults of this pest. The susceptible lemon (C. jambhiri) ‘Rugoso’ was used as control. Based on the number of eggs and pupae obtained on each plant, five genotypes were selected as the most promising: tangerina ‘Sunki’ (Citrus sunki Hort. ex. Tanaka), the hybrids C x R4 (C. sunki x Poncirus trifoliata), C x R315 (C. sunki x P. trifoliata), M x P222 (C. sinensis x Tangor Murcott) and P. trifoliata (Trifoliata Limeira). So, the oviposition preference, and the development and reproduction of the insect were evaluated on these six genotypes. In the free-choice oviposition preference test the hybrid C x R315 and Trifoliata Limeira were the least preferred by CLM. In the no-choice test, the effect of genotypes was less evident occurring less oviposition in Trifoliata Limeira than in lemon ‘Rugoso’. The different genotypes of citrus did not influence the duration and viability of egg, larval and pupal stages of P. citrella. It was therefore observed that genotypes influenced size and pupal weight, being the hybrid C x R4 the least adequate. Females from larvae reared on hibrids C x R4 and C x R315 oviposited the least numbers of eggs. In the tolerance test, it was concluded that leaf damage was the better parameter for discriminating the genotypes in relation to attack by P. citrella. The fresh and dry weight were not adequate parameters for tolerance study. The genotypes Trifoliata Limeira and its hybrid C x R4 were tolerants to CLM while tangerina ‘Sunki’ and the lemon ‘Rugoso’ were susceptible.

Resistência de genótipos de citros a lagarta-minadora-dos-citros Phyllocnistis citrella Stainton, 1856 (Lepidoptera: Gracillariidae)