Neoscapteriscus borellii and Neoscapteriscus tenuis (Orthoptera: Gryllotalpidae): first record in tobacco plantations in the state of Bahia, Brazil.

Species of Gryllotapidae are commonly known as mole crickets. These solitary crickets (Bailey et al. 2015) are differentiated from other crickets by their morphological and behavioral adaptations related to their subterranean lifestyle (Ulagaraj 1975; Howard et al. 2008; Bailey et al. 2015). All species of Neoscapteriscus (Orthopera: Gryllotalpidae) occur naturally in the Neotropical region (Cadena-Castaneda 2015; Cigliano et al. 2016), but since the mid-eighteenth century, some species have been accidently introduced elsewhere and cause damage to several crops in the Americas (Nickle 2003) and Australia (Rentz 1995), and sometimes are considered important pests where they occur (Heads et al. 2013).

These insects are included among pests of pasture, turfgrass and vegetable crops (Walker 1982; Schuster & Price 1992; Adjei et al. 2003; Bailey et al. 2015). They cause direct loss by feeding on roots from within tunnels, and indirectly by mechanical damage when they dig tunnels in the soil around plants (Walker 1982; Schuster & Price 1992; Xu et al. 2012). The species Neoscapteriscus borellii (Giglio-Tos) and Neoscapteriscus tenuis (Scudder) are thought to have originated in South America (Nickle 2003) and aside from their status as pests, distribution and biological information on these insects are needed. Neoscapteriscus tenuis is an omnivorous species and is considered to be plant pests when occurring in high population densities (Fowler et al. 1985). Neoscapteriscus borellii nymphs feed on both vegetative and animal materials, but adults are primarily herbivorous (Silcox & Brandenburg 2011). In Brazil, S. tenuis was reported in the states of Ceara, Para, Piaui, Mato Grosso do Sul, and Rio Grande do Norte, and S. borellii in Ceara, Goias, Minas Gerais, Mato Grosso, Para, Paraiba, Pernambuco, Rio de Janeiro, Rio Grande do Norte, Rio Grande do Sul, Sao Paulo, and Santa Catarina (Nickle 2003).

There are few surveys of Neoscapteriscus species in Brazilian agricultural systems. The only surveys were in Ceara (Vieira et al. 1976; Bastos 1977) in vegetables, and (Bastos 1977); in Sao Paulo (Fowler et al. 1985, 1986, 1989), and in Rio Grande do Sul, (Canhedo-Lascombe & Corseuil 1996) in vegetables, rice plantations, and golf courses. Thus, there is a lack of information about the distribution and biology of these insects. Here we present the first records of N. borelli and N. tenuis in tobacco plantations in Bahia State, Brazil.

Adults and nymphs of mole cricket were captured using pitfall traps placed in tobacco plantations (Fig. 1A) from Dec 2011 to Jun 2012 in the municipalities of Cruz das Almas (12.6670[degrees] S, 39.1000[degrees] W), Governador Mangabeira (12.5600[degrees] S, 39.8000[degrees] W), and Muritiba (12.6100[degrees] S, 38.5900[degrees] W) in the Reconcavo Baiano, Bahia, Brazil. The traps were buried in the soil, and consisted of polystyrene cups (15 cm height, 7 cm diam) containing 150 mL of 50% ethanol. The sampling was conducted in 1 tobacco plantation in each municipality. In each site, 10 traps were positioned in a 100 m transect with the traps equally spaced (10 m apart). Each of the sites was sampled on 14 different dates at 15 d intervals using traps that remained in field for 48 h. The insects were stored in 70% ethanol, mounted on entomological pins, identified and deposited at the Entomology Museum of the Universidade Federal do Reconcavo da Bahia. The identification was based on taxonomic key of Nickle (2003).

We collected a total of 169 specimens of Neoscapteriscus, of which 104 were nymphs. The available keys and descriptions for the identification of Scapteriscus Scudder (Orthopera: Gryllotalpidae) species present only characteristics of adults and, therefore, nymphs were not identified to the species level. Twenty four individuals of N. borellii and 41 of N. tenuis were collected from the tobacco plantations. This is the first record of N. borellii and N. tenuis in Bahia State (Fig. 1B, C). This finding expands the area of distribution of these species in Brazil. Clearly, both species are well distributed in Brazil and well adapted for the Neotropical region (Nickle 2003). Also, due to their vast dietary diversity (Xu et al. 2013) they can spill over and establish in other regions. For example, N. borellii was introduced accidentally in North America via commercial sailing vessels from South America (Walker & Nickle 1981), and now is one of the most common species of mole crickets in the southeastern United States (Nickle 2003; Bailey et al. 2015). Adults are long-winged and can fly, dispersing readily to new areas (Ulagaraj 1975; Dillman et al. 2014), which might be one of the reasons that explain their extensive distribution in Brazil.

The species of Gryllotalpidae previously known from Bahia State are: Neoscapteriscus abbreviatus (Scudder), Neoscapteriscus didactylus (Latreille), Neocurtilla hexadactyla (Perty), and Neoscapteriscus vicinus (Scudder). However, except in the studies of Nickle (2003) and Nickle & Castner (1984) the occurrence of these species is not well documented, and the taxonomy and bio-ecology of these species have not been studied. Previous records of Neoscapteriscus species in Bahia State include: N. abbreviatus (8 specimens) collected in the municipality of Salvador in 1951 (Nickle & Castner 1984); N. didactylus, reported as pests of tobacco plants in Bahia, but with information that makes it impossible to differentiate them from the other species of the same genus (Costa 1967); and records of N. hexadactyla and N. vicinus, without any other information (Silva et al. 1968).

It is likely that N. borellii and N. tenuis might be causing mechanical damage to Nicotiana tabacum L. (Solanaceae) roots due to their extensive gallery construction in the soil. Although these plants produce alkaloids that are toxic to some herbivorous insects (Pakdeechanuan et al. 2012; Sagheer et al. 2013), species of mole crickets are reported to damage tobacco seedlings by feeding (Barret 1902; Walker 1982; Schuster & Price 1992) and N. didactylus was designated a pest in tobacco plantations in the state of Bahia (Costa 1967). The herbivorous habits of N. borellii and N. tenuis (Fowler et al. 1985; Adjei et al. 2003; Silcox & Brandenburg 2011) suggests that they may also consume tobacco, however, this needs to be confirmed. Furthermore, high density of these species might cause economic damage through tunneling activity (Fowler et al. 1985; Silcox & Brandenburg 2011). Thus, the occurrence of N. borellii and N. tenuis in tobacco plantations in the region of Reconcavo Baiano deserves attention due to their possible direct or indirect damage. Tobacco has great socioeconomic importance due to the generation of employment and income in agriculture and industry (Specht et al. 2006). Brazil is the second largest producer and largest global exporter of tobacco (Meucci et al. 2015), and Bahia has tobacco as its principal export product (Baud & Koonings 1999). In particular, tobacco is socially and economically important in the area of Reconcavo Baiano.

We thank to Carlos Daniel Seifert Schmidt (Danco Comercio e Industria de Fumos Ltda, Cruz das Almas, Bahia, Brasil) for collecting the insects. PROTAX/CNPq (Proc. n[degrees] 440664/2015-2 and FAPES (TO n[degrees] 0834/2015). MRP was supported by DCR research grant from CNPq/FAPES (Proc. n[degrees] 312553/2015-3), Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG), and Programa Cooperativo sobre Protecao Florestal/PROTEF do Instituto de Pesquisas e Estudos Florestais/IPEF for financial support.

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Kleber de Sousa Pereira (1,4*), Oton Meira Marques (1), Anderson Puker (2), Marcelo Ribeiro Pereira (3), and Jose Cola Zanuncio (4)

(1) Federal University of Reconcavo of the Bahia, Center of Agrarian, Environmental and Biological Sciences, Cruz das Almas, Bahia, 44380-000, Brazil, E-mail: [email protected] (K. d. S. P.); [email protected] (O. M. M.)

(2) Faculdades Integradas Aparicio Carvalho, Porto Velho, Rondonia, 76811-678, Brazil, E-mail: [email protected] (A. P.)

(3) Federal University of Vicosa - Campus of Rio Paranaiba, Institute of Biological Sciences and Health, Rio Paranaiba, Minas Gerais, 38810-000, Brazil. E-mail: [email protected] (M. R.)

(4) Federal University of Vicosa, Department of Entomology, Vicosa, Minas Gerais, 36570-900, Brazil, E-mail: [email protected] (J. C. Z.)

(*) Corresponding author; E-mail: [email protected]

Caption: Fig. 1. Traps and collected species. (A) Pitfall traps in tobacco plantation, (B) Neoscapteriscus borellii (Giglio-Tos), dorsal view (C) Neoscapteriscus tenuis (Scudder), dorsal view.

Please Note: Illustration(s) are not available due to copyright restrictions.

Article Details

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Title Annotation:	Scientific Notes
Author:	de Sousa, Kleber Pereira; Marques, Oton Meira; Puker, Anderson; Pereira, Marcelo Ribeiro; Zanuncio,
Publication:	Florida Entomologist
Article Type:	Report
Geographic Code:	3BRAZ
Date:	Mar 1, 2018
Words:	2188
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Topics:	Crickets Grylloidea Distribution Identification and classification Plantations Tobacco (Plant) Diseases and pests