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PARASITISM OF FRUIT FLIES (TEPHRITIDAE) IN FIELD, AFTER THE RELEASES OF Diachasmimorpha longicaudata (ASHMEAD) (HYMENOPTERA: BRACONIDAE) IN RIO GRANDE DO SUL
ABSTRACT Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae) was introduced in 1994, in Northeastern Brazil, to evaluate its use in biological control programs of fruit flies. However, the effects of this specie on parasitism rates on the population of native parasitoids and fruit flies...
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Published in: | Revista Brasileira de Fruticultura 2016, Vol.38 (2) |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | ABSTRACT Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae) was introduced in 1994, in Northeastern Brazil, to evaluate its use in biological control programs of fruit flies. However, the effects of this specie on parasitism rates on the population of native parasitoids and fruit flies in Southern Brazil conditions are unknown. The objective of this study was to evaluate the impact of releases of D. longicaudata on the parasitism rates on loquats, peach trees, strawberry guava trees, and persimmons in an experimental area in the city of Eldorado do Sul, Rio Grande do Sul, in southern Brazil. In the first year of the study, fruits were collected and stored in the laboratory to obtain pupae. The flies or parasitoids that emerged were counted and identified. In the second year, adults of D. longicaudata were reared in the laboratory on Anastrepha fraterculus (Wied.) and larvae were released in the field (1.700 insects/ha) at each harvest time and the parasitism was evaluated in the same manner as in the first year. In the third year, the procedure was the same as the first year, without any releases. A significant increase in the rates of parasitism was recorded in the second year except in the persimmon, in which no parasitoid was recovered in any year. In the second year the number of emerged fruit flies was also lower. In the third year, no D. longicaudata were recorded and parasitism rates of parasitism were statistically similar to those found in the first year. The native parasitoids collected were Aganaspis pelleranoi (Brèthes), Doryctobracon areolatus (Szépligeti), Doryctobracon brasiliensis (Szépligeti) and Utetes anastrephae (Viereck). These species were found in at least one kind of fruit even in the years after the introduction of the exotic parasitoid, indicating that it was not harmful to these species. We conclude that D. longicaudata can help to reduce the population of fruit flies in Eldorado do Sul region, in Rio Grande do Sul.
RESUMO Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae) foi introduzido Nordeste do Brasil em 1994, para avaliar a possibilidade de uso em um programa de controle biológico de moscas-das-frutas. No entanto, os efeitos desta espécie nos índices de parasitismo e nas populações de parasitoides nativos nas condições do Sul do Brasil, são desconhecidos. O objetivo deste trabalho foi avaliar o impacto das liberações de D. longicaudata no parasitismo de moscas-das-frutas em nêsperas, pêssegos, a |
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ISSN: | 0100-2945 1806-9967 0100-2945 |
DOI: | 10.1590/0100-29452016673 |