Field infestation and spatial distribution of introduced Bactrocera carambolae Drew and Hancock and native species of Anastrepha in common guavas [Psidium guajava (L.)] were investigated in the eastern Amazon. Fruit sampling was carried out in the municipalities of Calçoene and Oiapoque in the state of Amapá, Brazil. The frequency distribution of larvae in fruit was fitted to the negative binomial distribution. Anastrepha striata was more abundant in both sampled areas in comparison to Anastrepha fraterculus (Wiedemann) and B. carambolae. The frequency distribution analysis of adults revealed an aggregated pattern for B. carambolae as well as for A. fraterculus and Anastrepha striata Schiner, described by the negative binomial distribution. Although the populations of Anastrepha spp. may have suffered some impact due to the presence of B. carambolae, the results are still not robust enough to indicate effective reduction in the abundance of Anastrepha spp. caused by B. carambolae in a general sense. The high degree of aggregation observed for both species suggests interspecific co-occurrence with the simultaneous presence of both species in the analysed fruit. Moreover, a significant fraction of uninfested guavas also indicated absence of competitive displacement.

ResumoEugenia stipitata McVaugh (Myrtaceae): recurso alimentar para moscas frugívoras no estado do Amapá, Brasil. Este trabalho foi realizado com o intuito de avaliar a infestação de frutos de Eugenia stipitata McVaugh (Myrtaceae) por moscas frugívoras no estado do Amapá, Brasil. Exatamente 95% dos frutos verdes e maduros apresentaram infestação. Porém, a infestação (pupários/fruto) foi maior em frutos maduros que em frutos verdes. Foram obtidas quatro espécies de Tephritidae e quatro de Lonchaeidae. Bactrocera carambolae (Tephritidae) predominou em frutos maduros. Não houve diferença na infestação por Anastrepha spp. (Tephritidae) e Neosilba spp. (Lonchaeidae) entre frutos verdes e maduros. Palavras-chave: Amazônia; Anastrepha; Bactrocera carambolae; Neosilba AbstractThis work was carried out to evaluate the infestation of fruits of Eugenia stipitata McVaugh (Myrtaceae) by fruit lies in the state of Amapá, Brazil. There was 95% infestation of the green and ripe fruits. However, infestation (puparia/fruit) was higher in ripe fruits than green fruits. Four species of Tephritidae and four species of Lonchaeidae were obtained. Bactrocera carambolae (Tephritidae) predominated in ripe fruits. There was no difference in infestation by Anastrepha spp. (Tephritidae) and Neosilba spp. (Lonchaeidae) between green and ripe fruits.

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