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First report of Lecanodiaspis dendrobii Douglas, 1892 (Hemiptera: Lecanodiaspididae) and the associated parasitoid Cephaleta sp.

1. Introduction

Lecanodiaspis dendrobii (Hemiptera: Coccoidea: Lecanodiaspididae) is a polyphagous scale insect that feeds on many plant species distributed in six botanic families: Euphorbiaceae, Fabaceae, Moraceae, Orchidaceae, Rutaceae and Verbenaceae (Garcia et al., 2015).

Macroscopically the body of the adult female of L. dendrobii is purplish-brown, flattened, covered by a light brown test infused with secondary white wax; test with longitudinal mediodorsal carina intersected by transverse raised lines. Male test similar in texture and appearance, more elongate. Microscopically L. dendrobii is characterized by having 3 to 5 cribriform plates on each side of body; anterior and posterior spiracular setae present; posterior spiracular furrows divided; antennae 7- to 9-segmented; legs rudimentary (Howell and Kosztarab, 1972; Miller et al., 2014).

Studies on the biology of this species have not been conducted yet and information about damages on their host plants are inexistent.

The lecanodiaspidid L. dendrobii was described by Douglas in 1892, collected on Dendrobium calceolaria (Orchidaceae) in Demerara, Republic of Guyana (Douglas, 1892). Later it was recorded in several places in Central and South America: Argentina (Buenos Aires, Cordoba, Corrientes, San Juan and Tucuman), Colombia, Guatemala, Honduras, Uruguay and Venezuela. Recently, it was also recorded in northern Mexico (Nearctic Region) (Garcia et al., 2015). As a consequence of their presence in Mexico, this pest was already included on the list of pests of quarantine importance to the U.S. (Miller et al., 2014).

The state of Roraima is bordered by two countries where L. dendrobii has been reported, Republic of Guyana and Venezuela, thus their occurrence has been expected in Brazil.

The present paper aims to report L. dendrobii for the first time in Brazil, as well as its parasitoid, morphological characters of this scale insect, symptoms presented by the host plants infested by this pest and suggestions for its management are given.

2. Material and Methods

Samples suspected to contain specimens of Lecanodiaspis dendrobii were initially collected in Roraima State, Brazil, by the first author (A.L.M.J), on branches and stems of several host plants in the municipalities: Boa Vista, in a reforestation area on young and mature plants of Acacia mangium Willd. (Fabaceae) and on a young plant of Xylopia aromatica (Lam.) Mart. (Annonaceae), (N 03[degrees]08'04.2", W 60[degrees]49'45.8"), in December 2009; in young plants of Leucaena leucocephala (Lam.) de Wit (Fabaceae), (N 02[degrees]57'41.2", W 60[degrees]42'53.0"), in January 2010; on one mature plant of Morus nigra L. (Moraceae), (N 02[degrees]45'27.5", W 60[degrees]43'48.4"), in February 2010; and Canta, on mature plants of Citrus reticulata Blanco (Rutaceae), (N 02[degrees]18'57.3", W 60[degrees]35'15.8"), in March 2010. Posteriorly, the fourth author (E.G.F.M) collected samples on mature plants of Tectona grandis Lf (Verbenaceae) in the municipality of Alto Alegre, (N 02[degrees]44'24.1", W 61[degrees]17'39.7"), in June 2011, on mature plants of Anacardium occidentale L. (Anacardiaceae) in the municipality of Canta, (N 02[degrees]43'24.4", W 60[degrees]40'37.5"), in March 2012, and on plants of Annona squamosa L. (Annonaceae), also in Canta (N 2[degrees]43'53.3", W 60[degrees]38'14.9"), in May 2014.

Part of the samples of the scale insect were stored in vials filled with 75% ethanol and the other part were placed in glass tubes, closed with cotton until the emergency of the parasitoids, and posteriorly stored in 100% ethanol. The scale insects and the hymenopterous parasitoid were identified respectively by the authors (A.L.B.G.P. and V.A.C.).

The lecanodiaspidids were mounted on microscopic slides following the methodology described by Gullan (1984) and identified according to morphological characteristics of the adult female as described by Howell and Kosztarab (1972) and Miller et al. (2014). The hymenopterous parasitoids were double-mounted on points and identified using Boucek and Heydon (1997) at the genus level and pertinent literature for species. The specimens of coccoids were deposited at the Universidade Federal de Sao Carlos, Sao Carlos, Sao Paulo, Brazil and the hymenopterous parasitoids at the "Colecao de Insetos Entomofagos Oscar Monte", Instituto Biologico, Campinas, Sao Paulo, Brazil.

3. Results

All samples of lecanodiaspidids collected on A. mangium, L. leucocephala, M. nigra and X. aromatica, in Boa Vista; on A. occidentale, C. reticulata and A. squamosa, in Canta; and T. grandis, in Alto Alegre; were identified as Lecanodiaspis dendrobii Douglas, 1892 (Hemiptera: Lecanodiaspididae) (Figure 1); and all these plants are recorded for the first time as host plants for L. dendrobii.

Based on material collected in Roraima, adult females (Figure 2) measure about 2.0-4.5 mm long and 1.5-3.5 mm wide. Eggs (Figure 3), and all instars of females and males (Figure 4) were found.

Mature plants when infested by L. dendrobii showed drying of apical branches (Figure 5), but when infestation occurred in young plants, injuries caused the death of the host (Figure 6). The honeydew excreted on the leaves, by this insect, favored the development of sooty mold (Figure 7), compromising plant photosynthesis and causing premature leaf drop.

The parasitoid associated with L. dendrobii was identified as Cephaleta sp. (Hymenoptera: Pteromalidae) (Figure 8) and it emerged from specimens collected on M. nigra in the municipality of Boa Vista.

4. Discussion

Lecanodiaspis dendrobii is the second species of the genus recorded in Brazil, previously only Lecanodiaspis rugosa Hempel, 1900 was known. The genus includes 54 species distributed in all zoogeographic regions except Antarctica, most restricted to Afrotropical and Australasian regions. For South America only seven of these species are known (Garcia et al., 2015).

According Miller et al. (2014), L. dendrobii and Lecanodiaspis prosopidis (Maskell, 1895), distributed between South Mexico and North USA, may be synonyms. Lecanodiaspis dendrobii differs by having 2 long setae anterior of vulva (absent in L. prosopidis) (Howell and Kosztarab, 1972; Miller et al., 2014). In this case, due to great microscopic similarity between the two species, additional morphological and molecular studies may help to confirm this supposition.

Six years after the record ofL. dendrobii in Brazil, in Boa Vista, it was found in rural areas of the two neighboring municipalities, Canta and Alto Alegre (Figure 1), and on new host plants, showing a good adaptation of the species in the region.

[FIGURE 1 OMITTED]

[FIGURE 2 OMITTED]

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[FIGURE 4 OMITTED]

[FIGURE 5 OMITTED]

At short distances, immature stages of these insects are easily transported by wind, water or animals, whereas the dispersion over long distances is done mainly through transport by the host plants. For monitoring of the distribution of L. dendrobii in Roraima and other states, visual inspection would be the best method and, the main measure to reduce the spread of this insect is to avert that plants or part of plants infested by lecanodiaspidids can be transported to places free of this insect.

[FIGURE 6 OMITTED]

Although damage caused by L. dendrobii on their host plants has not been mentioned, Trelles (1938) reported that this pest was very abundant throughout Argentina, both in wild as cultivated plants, including Citrus spp. More recently, Granara de Willink and Claps (2003) made an inventory of scale insects associated to ornamental plants in Tucuman, Argentina, and they mentioned that L. dendrobii was not abundant on ornamental plants.

In Brazil, significant damage was recorded mainly on A. mangium, M. nigra and L. leucocephala. The injuries presented by these plants as partial or total plant dry is similar with those observed for some species of Diaspididae, differing from damage mentioned by Howell and Kosztarab (1972) to some members of Lecanodiaspididae that typically cause a depression in the host plant's tissues and often distortion of the shoots.

The natural enemies of L. dendrobii known until now are the gregarious endoparasitoids Anisophleps alternata Fidalgo, 1981 and Metaphycus terani Fidalgo, 1981 (Hymenoptera: Encyrtidae), which have been observed on citrus in Tucuman, Argentina (Fidalgo, 1981). Blanchard (1938) also recorded the occurrence of a Signiphora species (Hymenoptera: Signiphoridae). Marietta caridei Brethes, 1918 (Hymenoptera: Aphelinidae) has also been associated to L. dendrobii (De Santis, 1967), but, according to Hayat (1986), Marietta species are secondary parasitoids of Coccoidea. M. caridei, besides Argentina (Massini and Brethes, 1918), also occurs in Brazil (Hayat, 1986) and Cuba (Hernandez and Ceballos, 1991 apud Noyes, 2014).

[FIGURE 7 OMITTED]

[FIGURE 8 OMITTED]

In Roraima state only the parasitoid Cephaleta sp. (Hymenoptera: Pteromalidae) was found in association with L. dendrobii. Interactions between species of Cephaleta, Cephaleta australiensis (Howard, 1896), Cephaleta brasiliensis (De Santis, 1963) and Cephaleta brunniventris Motschulsky, 1859, with species of Asterolecaniidae, Cerococcidae, Coccidae, Eriococcidae and Pseudococcidae have been reported (Noyes, 2014), but with species of lecanodiaspidid is new.

This Cephaleta species is thought to be new because it differs from C. brasiliensis, the only specie of the genus known to occur in Brazil (De Santis, 1963), by the proportions of veins and absence of infumated area in the fore wings. Also, it differs from C. brunniventris and C. australiensis, which are the more widespread species of the genus, by the proportions of funicle segments and color of the gaster, in the case of C. brunniventris.

The potential of Cephaleta sp. in the biological control of L. dendrobii needs to be studied as well as the inventory of other potential predators and parasitoids.

Following the norms for the notification of the occurrence of exotic pest in the country, immediately after the confirmation of L. dendrobii in Boa Vista, Roraima, the Ministerio da Agricultura, Pecuaria e Abastecimento (MAPA) was communicated, according to IN 52 of the MAPA (Brasil, 2007), in order that preventive measures be taken to avert the spread of this pest for other Brazilian states.

Based on the observed damage in plants infested by L. dendrobii in the state of Roraima, this scale insect could become an important fruticulture and silviculture pest in Brazil, if biological control agents are not effective in controlling this exotic species.

http://dx.doi.org/10.1590/1519-6984.20314

Acknowledgements

We are grateful to Dr. Daniel Alejandro Aquino, Museo de La Plata/Universidad Nacional de La Plata, Buenos Aires, Argentina, for the help with the paratypes of Cephaleta brasiliensis; to the "Instituto Nacional de Ciencia e Tecnologia dos Hymenoptera Parasitoides da Regiao Sudeste Brasileira", for financial support to one of the authors and to Dr. Takumasa Kondo (CORPOICA, Palmira, Colombia) for reviewing the manuscript.

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A. L. Marsaro Junior (a) *, A. L. B. G. Peronti (b), V. A. Costa (c), E. G. F Morais (d) and P R. V. S. Pereira (a)

(a) Laboratorio de Entomologia, Embrapa Trigo, BR 285, km 294, CP 451, CEP 99001-970, Passo Fundo, RS, Brazil

(b) Departamento de Fitossanidade, Faculdade de Ciencias Agrarias e Veterinarias - FCAV, Universidade Estadual Paulista "Julio de Mesquita Filho" - UNESP, Rod. Prof. Paulo Donato Castellane, km 5, CEP 14884-900, Jaboticabal, SP, Brazil

(c) Centro Experimental Central, Instituto Biologico, Rod. Heitor Penteado, km 3, CEP 13001-970, Campinas, SP, Brazil

(d) Laboratorio de Entomologia, Embrapa Roraima, BR 174, km 8, CP 133, CEP 69301-970, Boa Vista, RR, Brazil

* e-mail: alberto.marsaro@embrapa.br

Received: September 26, 2014 - Accepted: November 6, 2014 - Distributed: February 29, 2016 (With 8 figures)
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Title Annotation:Original Article
Author:Marsaro, A.L., Jr.; Peronti, A.L.B.G.; Costa, V.A.; Morais, E.G.F.; Pereira, P.R. V.S.
Publication:Brazilian Journal of Biology
Date:Feb 1, 2016
Words:2366
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