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SEASONAL ABUNDANCE OF Dione juno juno (Cramer, 1779) (Lepidoptera: Nymphalidae) IN Passiflora spp., SAMPLING METHODS AND GENOTYPES RESISTANCE

This research was developed during three years (1991/94), under field conditions, in Jaboticabal, SP, Brazil to study the seasonal abundance of Dione juno juno, to evaluate sampling methods and the resistance of Passiflora spp. genotypes. Twelve genotypes were used among species and hybrids. The surveys were conducted at two- week intervals, estimating the number of larvae, the number of leaves and the number of leaves attacked in 0.25 m2, and also in 1.5 linear meters. The results showed that the occurrence of D. juno juno was higher during the winter, with populational peak in July, followed by spring and summer, with another peak in December. The sampling of number of leaves attacked by D. juno juno/0.25 m2 and percentage of leaves attacked/0.25 m2 were the most suitable criteria for genotype evaluation. The genotypes P. alata, P. setacea, P. coccinea, P. nitida, P. alata2 x P. macrocarpa were not attacked and the P. edulis x P. setacea was lightly attacked, while P. cincinnata, P. edulis, P. edulis x P. alata, P. edulis x P. giberti and P. caerulea were the most infested.

insecta; host plant resistance; seasonal abundance

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