Rediscovery of Gryon chrysolaum (Walker) (Hymenoptera: Platygastridae)—an egg parasitoid of Holhymenia rubiginosa Breddin and Anisoscelis foliacea Fabricius (Heteroptera: Coreidae)

Abstract

During surveys of natural enemies of the leaf-footed bugs Holhymenia rubiginosa Breddin and Anisoscelis foliacea Fabricius in Rio Grande do Sul State, Brazil, two species of primary egg parasitoids belonging to the genus Gryon were reared from these hosts. One of these Gryon species was identified as G. chrysolaum Walker, a species unknown since its description nearly 170 years ago. The second Gryon species reared was G. vitripenne Masner. These rearings represent the first host records for this species. Levels of parasitism by G. chrysolaum were 35% and 53% on H. rubiginosa and A. foliacea respectively. Additional specimens reared were a Neorileya and a Telenomus species. After examination of unidentified Gryon specimens in the Natural History Museum, London, a further three specimens were located, from Brazil and Mexico. Data on hosts and localities of all known specimens of G. chrysolaum are presented, and the species is redescribed and compared with its closest known relatives. The female is described for the first time.

Gryon vitripenne Masner (Hymenoptera: Platygastridae), new host-parasitoid association with Leptoglossus zonatus (Dallas) (Heteroptera: Coreidae) in corn crop and extension of geographic range

“…The present paper extends the geographic range of G. vitripenne to Sete Lagoas municipality, Minas Gerais State, Brazil, about 7,600 km SE from Brownsville and Harlingen, Texas, EUA, the types localities (Masner 1983), and about 1,200 km SE from Campo Verde, Mato Grosso State and 1,400 km NE from Porto Alegre, Rio Grande do Sul State, the previously known records in Brazil (Polaszek and Kolberg 2008;Margaría 2008;Margaría et al 2009). Based on the results of this study we have increased the knowledge about the associations and distribution of G. vitripenne, a potential agent of biological control of L. zonatus.…”

“…Almost nothing is known about the biology and habits of G. vitripenne: when Masner (1983) described the species he stated that part of the type series was obtained from eggs of an unidentified coreid. Polaszek and Kolberg (2008) reported the primary parasitism of G. vitripenne in Holhymenia rubiginosa Breddin, 1904 and Anisoscelis foliaceus (Fabricius, 1803) (Heteroptera: Coreidae) eggs, Margaría (2008) and Margaría et al (2009) reported that exemplars of G. vitripenne were reared form eggs of unidentified bugs on Oryza sativa (Poaceae).…”

“…The taxonomy of Gryon is currently very poorly known (Polaszek and Kolberg 2008) and there has been no in-depth taxonomic studies on Neotropical Gryon despite the fact of Masner (1983) stated that species of this genus are important biological control agents of some Heteroptera pests by killing their hosts on egg stage.…”

First Parasitism Record of the Eggs of Thlastocoris laetus Mayr, 1866 (Hemiptera: Coreidae) and New Host and Distribution Records for Hadronotus vitripennis (Masner, 1983) (Hymenoptera: Scelionidae)

“…The wasp species has been recorded parasitizing eggs of Holhymenia rubiginosa Breddin, 1904 (Hemiptera: Coreidae) in passionfruit crops (Paloszeck & Kolberg 2008), eggs of Leptoglossus zonatus Dallas, 1852 (Hemiptera: Coreidae) (Perioto et al 2019) and an undetermined species of mealybugs in rice crops (Margaría et al 2009).…”