Research Article |
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Corresponding author: Željko Tomanović ( ztoman@bio.bg.ac.rs ) Academic editor: Jovana M. Jasso-Martínez
© 2025 Željko Tomanović, Korana Kocić, Sofía Belén Forte, Joel Nazareno Lentini, María del Pilar Medialdea, Camila Noemí Villar, Analí Bustos, Ana Lia Gayan-Quijano, Francisco Javier Peris-Felipo, Mariano Devoto.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Tomanović Ž, Kocić K, Belén Forte S, Nazareno Lentini J, del Pilar Medialdea M, Noemí Villar C, Bustos A, Gayan-Quijano AL, Peris-Felipo FJ, Devoto M (2025) Two new aphid parasitoids (Hymenoptera, Braconidae, Aphidiinae) from field crops of South America. Journal of Hymenoptera Research 98: 311-324. https://doi.org/10.3897/jhr.98.144079
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During two seasons of field sampling in crop fields in Argentina, a total of 2,276 Aphidiinae specimens were collected using Malaise traps positioned in maize, soybean, and wheat fields. Eight known species of aphid parasitoids were identified (Aphidius platensis Brethes, 1913, A. ervi Haliday, 1834, A. rhopalosiphi de Stefani-Perez, 1902, A. uzbekistanicus Luzhetzki, 1960, A. matricariae Haliday, 1834, Diaeretiella rapae (McIntosh, 1855), Lysiphlebus testaceipes (Cresson, 1880), and Praon gallicum Starý, 1971). Additionally, two new species of aphid parasitoids were discovered, bringing the total to ten species reported from these crops in the country. Here, we describe and provide diagnoses for Aphidius brethes sp. nov. and Trioxys pampas sp. nov., which is the first record of winged species of the genus Trioxys in South America.
A. brethes sp. nov., Argentina, Malaise trap, parasitoid wasps, T. pampas sp. nov.
Cereal crops are among the most widespread in the world. Many different biological control programs have been used against various cereal pests, that range from fungal pathogens (
Systematic Aphidiinae trapping was conducted in agricultural fields within the Rolling Pampas of Argentina (Fig.
Initially, the study involved 12 fields, each with ten Malaise traps systematically positioned at specific distances from the field edge (10, 50, 100, and 150 meters) (Fig.
Traps were only active during periods when crops were present in the fields. They were removed immediately prior to harvest and reinstalled a few days after sowing, with no sampling conducted during fallow periods. Trapping occurred over two years (July 2022 to April 2024). During the first year (July 2022 to May 2023), traps were continuously active and emptied twice monthly. In the second year (August 2023 to April 2024), traps operated for 15 days each month. A total of 976 samples were analyzed for Aphidiinae and other agronomically relevant arthropods. Average field size was 77.25 ha (range: 40–213 ha).
The region experiences distinct seasonal variations, with summer temperatures often exceeding 30 °C and winter temperatures dropping below freezing. The diurnal temperature range is particularly significant in summer, with average annual temperatures between 13 °C and 17 °C. Most precipitation occurs during summer months (
Specimens were preserved in 70% alcohol and later identified to the species level. External morphology was examined using a ZEISS Discovery V8 stereomicroscope, with several specimens dissected and slide-mounted in Berlese medium. Morphological terminology follows
In total we collected 2276 aphid parasitoid specimens, from eight species: Aphidius platensis Brethes, 1913 [866 specimens (842♀ 24♂); 38.05%], A. ervi Haliday, 1834 [731 (588♀ 143♂) (32.12%)], A. rhopalosiphi de Stefani-Perez, 1902 [2 (2♀); below 1%], A. uzbekistanicus Luzhetzki, 1960 [7 (5♀2♂); below 1%], A. matricariae Haliday, 1834 [5 (5♀); below 1%], Diaeretiella rapae (McIntosh, 1855) [621 (584♀ 37♂); 27.28%], Lysiphlebus testaceipes (Cresson, 1880) [30 (26♀4♂); 1.32%], and Praon gallicum Starý, 1971 [6 (5♀1♂); below 1%]. All collected parasitoid species are associated with pest aphids from investigated crops.
Additionally, we collected two unknown species: six specimens (5♀ 1♂) of Aphidius (Lysaphidus) sp. and two individuals of Trioxys sp. (2♀). After their examination, we found that they are new to science. Unfortunately, DNA extraction was unsuccessful, probably due to bad preservation of specimens.
Order Hymenoptera L., 1758
Family Braconidae Nees, 1811
Subfamily Aphidiinae Haliday, 1833
Holotype
: • 1 ♀, Argentina, sample 85APHI, 34°27'35"S, 61°48'46"W (Leandro N. Alem County), 29.XI.2022, collected by Malaise traps in field margin of first-crop soybean, leg. M. Devoto & collabs. Holotype deposited in coll. Museo Argentino de Ciencias Naturales ”Bernardino Rivadavia”, Argentina (
Paratypes
: • 1 ♀, sample 540APHI, Argentina, 33°56'16"S, 59°37'04"W (Baradero County), 28.IV.2023, collected by Malaise traps in field margin of first-crop soybean, leg. M. Devoto & collabs. (
By wing venation pattern (M+m-cu vein partly developed under r-m vein) (Fig.
Female (holotype). Length. Body 1.5–1.7 mm; fore wing 1.6 mm; hind wing 1.2 mm.
Head
(Fig.
Mesosoma. Mesoscutum (Fig.
Metasoma. Petiole (Fig.
Coloration. General body color yellow to light brown (Fig.
Male (Figs
Aphidius brethes sp. nov. was collected in Argentina and currently it is its only known distribution.
Unknown, collected by Malaise traps within field crops.
The new species takes its name by Juan Brèthes, an Argentine scientist, naturalist, entomologist who has described several aphid parasitoid species.
Holotype
: • 1 ♀, Argentina, sample 122APHI, 34°29'30"S, 61°44'39"W (Leandro N. Alem County), Argentina, 31.X.2022, collected by Malaise traps in margin of maize field, leg. M. Devoto & collabs. Holotype deposited in coll. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina (
Paratypes : • 1 ♀, 8APHI, 34°28'56"S, 61°47'18"W (Leandro N. Alem County), Argentina, 11.XI.2022, collected by Malaise traps in wheat field, leg. M. Devoto & collabs. (NMB).
The new species is distinguishable from its congeners by combination of characters: apical clawlike bristle and two short setae at the tip of prongs (Fig.
Female (holotype). Length. Body 1.3 mm; fore wing 1.2 mm; hind wing 1.0 mm.
Head. Eye large (Fig.
Mesosoma. Mesoscutum with short notauli distinct anteriorly with 1–2 rows of sparse long setae at each side (Fig.
Metasoma. Petiole (Fig.
Coloration. Head brown, gena, face, clypeus, mouthparts light brown. Pedicel and scapus light brown to brown, annellus yellowish, flagellomere 1 and flagellomere 2 light brown, remaining part of antennae brown. Mesonotum and propodeum light brown, the rest of mesosoma yellow. Legs light brown with yellow trochanters. Petiole yellow to light brown, the rest of metasoma light brown to brown. Ovipositor sheaths and prongs light brown.
Male. Unknown.
Trioxys pampas sp. nov. was collected in Argentina and it is only known species distribution at the moment.
Unknown, collected by Malaise traps within maize field and wheat fields margin.
The new species takes its name by Rolling Pampas of Argentina where was collected.
Species composition and diversity of aphid parasitoids as important natural enemies of aphids in cereal and soybean crops are well known. The recent study on parasitoids parasitizing aphids from cereal crops in Europe reported 26 parasitoid species (
We express our sincere gratitude to MSU and Adecoagro, and Santa Ines, Los Montes and La Casualidad farms for graciously permitting us to carry out this study. Additionally, our heartfelt thanks go to Julio Muriel, Hernan Barbero and Federico Pandol for their invaluable contributions to this project. The present work was funded by the project LivinGro® (Syngenta) and partially funded by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia (Grant numbers 451-03-65/2024-03/ 200178 and 451-03-66/2024-03/ 200178) and the Serbian Academy of Sciences and Arts (grant no. F131).