Protopolybia exigua (Hymenoptera: Vespidae) nesting on Citrus grandis (Rutaceae).
Two nests were collected with an entomological net in Divinopolis, Minas Gerais State, Brazil (20.149904[degrees]S, 44.895827[degrees]W) on pomelo (Citrus grandis [L.]) (Rutaceae) in Jul of 2017. One of the P. exigua nests found under pomelo leaves (Fig. 1) was active and another was abandoned. These insects were killed in ether vapor and preserved in 70% ethanol for identification. The numbers of pedicels, brood, and adults in the colony were determined.
The active colony of P. exigua had 12 pedicels, 600 brood cells, and 15 adult wasps. The number of pedicels, brood, and adults of this wasp in this colony were higher than those of this wasp collected in Pedregulho (southeastern Brazil), which was a younger nest, possessing 1 pedicel and 307 brood cells with 46 eggs, 28 workers, 37 intermediaries, and 30 queens (Noll et al. 1996). The high cell count but low numbers of active wasps in the P. exigua nest in this study indicate a declining stage. The life expectancy of queens of this wasp is up to 1 yr, but their nests are abandoned after about 6 mo due to the invasion by parasitoids of P. exigua wasp larvae, as reported for Pachysomoides sp. (Hymenoptera: Ichneumonidae: Cryptinae), and Megaselia scalaris (Loew) (Diptera: Phoridae) in nests of Mischocyttarus cassununga (von Ihering) (Hymenoptera: Vespidae) (Soares et al. 2006). In addition, the study was conducted in a cold, dry season, when foraging activity of P. exigua is lower, and few nests of this species are active (Ribeiro-Junior et al. 2006).
The pedicel number of the P. exigua colony is common for the genus Protopolybia, whose species build nests supported by a central pedicel or several smaller ones (Wenzel 1998). The nests of these wasps are found underneath or between leaves, in the first case with a fragile and whitish wrapping, and in the second, supported by 1 leaf and several others glued to each other by oral secretion, functioning as an envelope (Somavilla et al. 2012).
The identification of nesting habits of social wasps in agroecosystems can be used to justify transferring or maintaining their colonies for biological control; moreover, there were no previous reports of P. exigua nesting on C. grandis plants.
We express our thanks to the Brazilian agencies "Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES/PELD), Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)," and "Programa Cooperativo sobre Protecao Florestal/ PROTEF" of the "Instituto de Pesquisas e Estudos Florestais/IPEF" for scholarships and financial support. We also are grateful to Andressa Vinha Zanuncio of the "Universidade Federal de Sao Joao Del Rey" for providing the nests studied.
Social wasps are predators. Two nests of Protopolybia exigua (Saussure) (Hymenoptera: Vespidae) were collected on pomelo (Citrus grandis [L.]) (Rutaceae) leaves, 1 active and another abandoned. The colonies of P. exigua were located under pomelo leaves, providing protection against adverse environmental conditions. The active nest had 12 pedicels, 600 brood cells, and 15 adult wasps. The knowledge of nesting habits of wasps in agroecosystems favors the management of these insects for biological control.
Key Words: biological control; foraging; grapefruit
Vespas sociais sao predadores. Dois ninhos de Protopolybia exigua (Saussure, 1854) (Hymenoptera: Vespidae) foram coletados em folhas de grapefruit (Citrus grandis [L.]) (Rutaceae), um ativo e outro abandonado. As colonias de P. exigua estavam localizadas sob folhas de pomelo, proporcionando protecao contra condicoes ambientais adversas. O ninho ativo tinha 12 pedicelos, 600 celulas de cria e 15 vespas adultas. O conhecimento dos habitos de nidificacao de vespas em agroecossistemas favorece o manejo desses insetos para o controle biologico.
Palavras Chave: controle biologico; forrageamento; pomelo
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Bruno Pandelo Brugger (1,*), Antonio Jose Vinha Zanuncio (2), Carlos Frederico Wilcken (3), Marcus Alvarenga Soares (4), and Jose Cola Zanuncio (1)
(1) Departamento de Entomologia/BIOAGRO, Universidade Federal de Vicosa, 36570-900, Vicosa, Minas Gerais, Brazil; E-mail: email@example.com (B. P. B.); firstname.lastname@example.org (J. C. Z.)
(2) Departamento de Engenharia Florestal, Universidade Federal de Vicosa, 36570-900 Vicosa, Minas Gerais, Brazil; E-mail: email@example.com (A. J. V. Z.)
(3) Departamento de Protecao Vegetal, Universidade Estadual Paulista (UNESP, FCA), Botucatu, Botucatu, Sao Paulo, Brazil; E-mail: firstname.lastname@example.org (C. F. W.)
(4) Programa de Pos-Graduacao em Producao Vegetal, Universidade Federal dos Vales Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil; E-mail: email@example.com(M. A. S.)
(*) Corresponding author; E-mail: firstname.lastname@example.org
Caption: Fig. 1. Protopolybia exigua (Hymenoptera: Vespidae) nest under Citrus grandis (Rutaceae) leaf.
Please Note: Illustration(s) are not available due to copyright restrictions.
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|Author:||Brugger, Bruno Pandelo; Zanuncio, Antonio Jose Vinha; Wilcken, Carlos Frederico; Soares, Marcus Alva|
|Date:||Mar 1, 2019|
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