2002
DOI: 10.1590/s1519-69842002000200011
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Natural enemies of the gall-maker Eugeniamyia dispar (Diptera, Cecidomyiidae): predatory ants and parasitoids

Abstract: Natural enemies of the gall maker Eugeniamyia dispar (Diptera: Cecidomyiidae) were studied on the urban area of Porto Alegre, RS, Brazil from October 1993 to March 1996. Galls and associated arthropods were followed weekly in the field on individual host plants (Eugenia uniflora, Myrtaceae) and also in the laboratory. Three species of ants attacked the galls, the most common being Pseudomyrmex sp. A proportion of galls was parasitised by Rileya sp. (Eurytomidae). The adults of this solitary ectoparasitoid were… Show more

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Cited by 13 publications
(5 citation statements)
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“…Our data indicate that adult gall midge females were either unable to lay eggs due to the presence of patrolling ants, or that midges actively avoided trees with this ant species. Ant workers of a generalist Pseudomyrmex ant have been reported to open leaf galls in Eugenia trees (Myrtaceae) and kill the larvae (Mendonça & Romanowski 2002). In contrast, in myrmecophytic Hirtella myrmecophila , defending Allomerus octoarticulatus ants seem unable to detect gall chemical cues, as gall extracts and galled leaf extracts did not recruit more workers than non‐galled leaf extracts (Izzo et al., 2006).…”
Section: Discussionmentioning
confidence: 99%
“…Our data indicate that adult gall midge females were either unable to lay eggs due to the presence of patrolling ants, or that midges actively avoided trees with this ant species. Ant workers of a generalist Pseudomyrmex ant have been reported to open leaf galls in Eugenia trees (Myrtaceae) and kill the larvae (Mendonça & Romanowski 2002). In contrast, in myrmecophytic Hirtella myrmecophila , defending Allomerus octoarticulatus ants seem unable to detect gall chemical cues, as gall extracts and galled leaf extracts did not recruit more workers than non‐galled leaf extracts (Izzo et al., 2006).…”
Section: Discussionmentioning
confidence: 99%
“…It is important to point out, however, that we could not evaluate whether the parasitoid also consumed gall resources directly (as for example Rileya sp. larvae seem to do in Eugeniamyia dispar galls, Mendonça & Romanowski, 2002), which could also generate an increase in parasitoid size, and consequently on its ovipositor size.…”
Section: Discussionmentioning
confidence: 99%
“…We thus refer to estimated population numbers of gallers instead of galls. The exit hole of the third instar larva could be identified (differing from parasitoid holes, mendonça & Romanowski, 2002a), and open galls were thus also counted.…”
Section: Methodsmentioning
confidence: 99%
“…Eggs are oviposited on developing leaves and shoots of the host. The first instar larva induces the gall, develops within it and leaves it to pupate in the soil (mendonça & Romanowski, 2002b). The gall is a spongy whitish unilocular sphere with 3.5-4 mm in diameter, formed mainly by hypertrophy of the parenchymatous tissue (mendonça et al, 1998).…”
mentioning
confidence: 99%