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14 June 2019 Maconellicoccus hirsutus (Hemiptera: Pseudococcidae) in Brazil: Recent Spread, Natural Enemies, and New Hosts
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Abstract

Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae) is an invasive and highly polyphagous pest with a worldwide distribution in tropical and subtropical regions. This study reports the geographical distribution, natural enemies, and host plant species of M. hirsutus in Brazil 8 years after its first report in this country. Maconellicoccus hirsutus is now distributed in 11 Brazilian states, in all major geographic regions of the country. Samples (n = 103) of plants infested by M. hirsutus were collected in the state of Espírito Santo, Brazil, with 96% of them found within the isotherm 23 to 27 °C. Hevea brasiliensis (Euphorbiaceae), Theobroma bicolor (Malvaceae), and T. speciosum (Malvaceae) are reported for the first time as hosts of M. hirsutus, and Coccoloba uvifera (Polygonaceae), Morus alba (Moraceae), Punica granatum (Lythraceae), and Talipariti tiliaceum (Malvaceae) are new hosts of M. hirsutus in Brazil. Thirty-seven host plant species of M. hirsutus are now confirmed in Brazil.

Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae), the pink hibiscus mealybug, is an invasive pest from southern Asia or Australia that now has a worldwide distribution in tropical and subtropical regions (Sagarra & Peterkin 1999; Chong et al. 2008; Garcia Morales et al. 2016). In the Americas, this mealybug was first detected in 1993 on the island of Grenada (Michaud & Evans 2000). It was first noted in South America in Guyana (Tambasco et al. 2000), and it now also is present in Brazil, Colombia, French Guiana, Suriname, and Venezuela (Culik et al. 2013a, b; García Morales et al. 2016). In Brazil, it was first detected in 2010 in the state of Roraima in northern Brazil, bordering Guyana and Venezuela (Marsaro Junior et al. 2013). By 2012, it had spread to the southern part of the state of Espírito Santo, in southeastern Brazil, about 3,400 km from Roraima (Culik et al. 2013a). Since 2010, M. hirsutus has spread to 9 other Brazilian states, including Pará (northern region) (Morais 2016; Peres-Filho et al. 2017); Alagoas, Bahia, Maranhão, and Pernambuco (northeastern region) (Silva et al. 2013a, b; Nakayama & Virgens Filho 2014; Oliveira et al. 2014; Souza et al. 2014; Broglio et al. 2015; Fornazier et al. 2017; Ramos et al. 2018); Mato Grosso (central-western region) (Morais et al. 2015; Peres-Filho et al. 2017); São Paulo (southeastern region) (Morais et al. 2015; Peronti et al. 2016); Rio Grande do Sul, and Santa Catarina (southern region) (Alexandre et al. 2014; Morais 2016). Based on these records, M. hirsutus was removed from the Brazilian List of Absent Quarantine Pests (A1) on 18 Dec 2013 (Brasil 2013). Maconellicoccus hirsutus is considered to be a quarantine pest, and may be a threat to agriculture in countries where it has been introduced because of its polyphagous behavior, invasiveness, and high reproductive potential (Cermeli et al. 2002; Martínez Rivero 2007). It has been reported from more than 350 species of host plants, in 222 genera and 78 botanical families, and may be a potential pest of many economically important crops, including fruits, fibers, grains, ornamental, and timber species (Garcia Morales et al. 2016).

This note summarizes recent research on the geographical spread, host plants, and natural enemies of M. hirsutus in Brazil since its reported establishment in this country 8 years ago (Marsaro Junior et al. 2013), and its dissemination and hosts in Espírito Santo State, southeastern Brazil, since it was first noted in this region in 2012 (Culik et al. 2013a). One hundred and three M. hirsutus-infested host plant samples were collected and geo-referenced (longitude, latitude) from 34 municipalities of Espírito Santo by professionals of the State Inspection Service of Agricultural and Forest Defense Institute of Espírito Santo (Idaf), the Capixaba Institute for Research and Technical Assistance and Rural Extension (Incaper), and the Executive Committee for the Planning of Cacao Crops (Ceplac/ES). Mealybug specimens were preserved in Eppendorf tubes (5 mL) with 70% alcohol, and mounted on microscope slides (Gullan 1984), with identification of the species made based on morphological characteristics of the adult female (Miller 1999; Miller et al. 2014) at the Laboratory of Entomology, Universidade Estadual Paulista “Júlio de Mesquita Filho” (FCAV/UNESP). A map with isotherms and M. hirsutus sampling points in Espírito Santo was prepared using ESRI ARCGIS 10.0, Arcmap software (ESRI 2011) and the Meteorological Information System/Incaper climatological database (Incaper 2018).

In Espírito Santo, M. hirsutus was found only in regions with annual mean temperatures from 20 to 27 °C, with 96% of M. hirsutus samples found in the isotherm 23 to 27 °C (Fig. 1). This annual mean temperature range (20 to 27 °C) is found in 87.6% of the area of the state. These results are consistent with previous research which indicates that temperatures most favorable for the development and reproduction of M. hirsutus are 25 to 27 °C, and the thermal thresholds for female development are 14.5 °C (Tmin) and 29 °C (Tmax) (Chong et al. 2008). In Espírito Santo, only 0.2% of its territory has annual mean temperatures below 14.5 °C, and none with annual mean temperature above 27 °C (Fig. 1). Therefore, temperatures in Espírito Santo do not represent a barrier to M. hirsutus population development.

Seventeen species of M. hirsutus host plants in 9 families were collected in Espírito Santo (Table 1). Hevea brasiliensis (Euphorbiaceae), Theobroma bicolor and T. speciosum (Malvaceae) are reported for the first time as hosts of M. hirsutus (García Morales et al. 2016). Coccoloba uvifera (Polygonaceae), Morus alba (Moraceae), Punica granatum (Lythraceae), and Talipariti tiliaceum (Malvaceae) are new M. hirsutus host records for Brazil. Abelmoschus esculentus (L.) Moench (Malvaceae), Theobroma cacao L. (Malvaceae), and Solanum americanum Mill. (Solanaceae) have been reported previously as M. hirsutus hosts in Espírito Santo (Culik et al. 2013a; García Morales et al. 2016; Fornazier et al. 2017), and the other 13 host species found are new M. hirsutus records for this state (Table 1). Highest populations of M. hirsutus were found associated with apical buds of young plants, resulting in deformation of shoots, leaves, and fruits, and death of inflorescences. Deformation of shoots and atrophy of terminal buds associated with high infestations of this mealybug observed in this study are similar to damage by the pest described in other studies (Martínez Rivero 2007; Morais et al. 2015; Fornazier et al. 2017). Hibiscus (n = 30) and cocoa (n = 30) were the most common plants found infested by M. hirsutus, and ornamental hibiscus plants (Hibiscus rosa-sinensis L.; Malvaceae) may be the most important hosts for dissemination of this mealybug in Espírito Santo. Talipariti tiliaceum (L.) Fryxell (Malvaceae) (n = 8) (sea hibiscus) and Coccoloba uvifera (L.) Crantz (Polygonaceae) (seagrape) are other hosts that may be important species for M. hirsutus dissemination because of their use as ornamental plants. Currently Talipariti is composed of 22 taxa that are found from southeastern Asia to Central and South America. Sea hibiscus was previously described as a species of the genus Hibiscus (Malvaceae) (Fryxell 2001), and it occurs from the southern to northeastern Brazilian coast (Moraes & Magenta 2014). Seagrape (Coccoloba uvifera) is widely grown on coastal beaches throughout tropical America and the Caribbean, including southern Florida, where it is also used as a seaside hedge in commercial landscapes (Gilman & Watson 2014).

Fig. 1.

Geographic distribution of Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae) in Brazil, and M. hirsutus collection locations in the state of Espírito Santo, Brazil.

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Plant species from 19 families have been reported as hosts of M. hirsutus in Brazil, including those of economic importance, such as Malvaceae (n = 7) and Fabaceae (n = 6), which are the most important host plant families in Brazil based on number of host plant species (Table 1), although Moraceae and Euphorbiaceae have the highest number of M. hirsutus host species worldwide (García Morales et al. 2016). Thirty-seven plant species are now reported as hosts of M. hirsutus in Brazil.

Although M. hirsutus has a large number of natural enemies (Culik et al. 2013b; Garcia Morales et al. 2016), none were observed in the present study. In Brazil, Anagyrus kamali Moursi (Hymenoptera: Encyrtidae), and Gyranusoidea indica Shafee, Alam & Agarwal (Hymenoptera: Encyrtidae) are reported as parasitoids of M. hirsutus, and Chilocorus nigrita (F.), Cryptolaemus montrouzieri Mulsant, Cycloneda sanguinea (L.), Eriopis (Germar), Exoplectra sp., Harmonia axyridis (Pallas), Tenuisvalvae notata (Mulsant) (all Coleoptera: Coccinellidae), and Ceraeochrysa sp. (Neuroptera: Chrysopidae) are listed as M. hirsutus predators (Culik et al. 2013a). Anagyrus kamali and C. montrouzieri have been the most common natural enemies associated with M. hirsutus in Brazil (Marsaro Junior et al. 2013; Peronti et al. 2016; Negrini et al. 2018). However, there have been no studies in Brazil to evaluate the establishment and efficiency of these natural enemies in agroeco-systems where M. hirsutus has caused damage (Morais 2016).

We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and the Fundação de Amparo à Pesquisa e Inovação do Espírito Santo (FAPES) for financial support.

Table 1.

Maconellicoccus hirsutus (Green) (Hemiptera: Pseudococcidae) host plants in Brazil including new records and references.

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(Continued)

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David dos S. Martins, Maurício J. Fornazier, Ana Lúcia B. G. Peronti, Mark P. Culik, Carlos Alberto S. Souza, Renato C. Taques, José S. Zanuncio Junior, and Renan B. Queiroz "Maconellicoccus hirsutus (Hemiptera: Pseudococcidae) in Brazil: Recent Spread, Natural Enemies, and New Hosts," Florida Entomologist 102(2), 438-443, (14 June 2019). https://doi.org/10.1653/024.102.0225
Published: 14 June 2019
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