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First Record of the Nearctic Zelus Renardii (Heteroptera, Reduviidae, Harpactocorinae) in Europe

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First Record of the Nearctic Zelus Renardii (Heteroptera, Reduviidae, Harpactocorinae) in Europe ENTOMOLOGIA HELLENICA Vol. 20, 2011 First record of the Nearctic Zelus renardii (Heteroptera, Reduviidae, Harpactocorinae) in Europe Petrakis P. N.AG.RE.F., Institute for Mediterranean Forest Ecosystem Research, Laboratory of Entomology, Terma Alkmanos, 11528 Athens, Greece Moulet P. Museum Requien, rue Joseph Vernet, F-84000 Avignin, France https://doi.org/10.12681/eh.11511 Copyright © 2017 P. V. Petrakis, P. Moulet To cite this article: Petrakis, P., & Moulet, P. (2011). First record of the Nearctic Zelus renardii (Heteroptera, Reduviidae, Harpactocorinae) in Europe. ENTOMOLOGIA HELLENICA, 20(2), 75-81. doi:https://doi.org/10.12681/eh.11511 http://epublishing.ekt.gr | e-Publisher: EKT | Downloaded at 29/03/2020 20:50:47 | ENTOMOLOGIA HELLENICA 20 (2011): 75-81 First record of the Nearctic Zelus renardii (Heteroptera, Reduviidae, Harpactocorinae) in Europe P.V. PETRAKIS1* AND P. MOULET2 1 N.AG.RE.F., Institute for Mediterranean Forest Ecosystem Research, Laboratory of Entomology, Terma Alkmanos, 11528 Athens, Greece 2 Museum Requien, rue Joseph Vernet, F-84000 Avignin, France ABSTRACT The Nearctic assasin bug species Zelus reinardii was found for the first time in Attica, Greece, Europe. This species is a generalist predator which can contribute to the control of insect pests. This is also a known predator of several biological control agents of pests. Therefore, its naturalization in Greece is potentially problematic in economic settings since the insect may act as both an intraguild and a beneficial predator. The risky nature of importation in other areas (e.g. Hawaii) showed the possibility of these ecological roles. KEYWORDS: Zelus renardii, distribution, invasive species. Introduction Invasion of assassin bugs in non-native The leafhopper assassin bug Zelus renardii regions usually triggers interception measures Kolenati, 1857 (Hemiptera, Reduviidae, because of their commonly broad diet. Such Harpactocorinae) was found in three predatory heteropterans are known to also localities in Attica, Greece for the first time switch to plant feeding increasing their in Europe. It is native of the Nearctic region survivorship (Stoner et al. 1975, Cohen 1990, (continental USA, Mexico, Guatemala) and Torres and Boyd 2009). has been putatively introduced into Hawaii, Amongst the c. 6900 species of assassin the Philippines and Jamaica (Maldonado bugs known worldwide, including about 110 1990) and recently reported from Chile species in Europe and 40 species in Greece, (Curkovic et al. 2004). This species has been only 3 species (two cryptogenic and one considered as a generalist predator with alien) are adventitious to Europe (Putshkov restricted ability to suppress pests (Frank and and Putshkov 1996, Rabitsch 2008, 2010, Slosser 1996, Rosenheim et al. 2004). Aukema 2011). This work reports on the It was recently discovered that Z. introduction of the Nearctic species, Z. renardii disrupts classical biological control renardii, to Greece. programs by exhibiting strong intraguild predation (IGP) on other intermediate The records predators that cause population reduction of crop pests (Ables 1978, Cohen and Tang Zelus renardii was found in three locations in 1997, Cisneros and Rosenheim 1998, the Attica prefecture in Greece. The first Rosenheim et al. 1999, Howarth and Preston finding was a recently captured dead male 2002, Ponsard et al. 2002, contra Law and insect within the glass housing of a road light Rosenheim 2011). in the area Thracomacedones – Olympiako *Corresponding author, e-mail: [email protected] http://epublishing.ekt.gr | e-Publisher: EKT | Downloaded at 29/03/2020 20:50:47 | 76 ENTOMOLOGIA HELLENICA 20 (2011): 75-81 Chorio (38o 7' 46''N, 23o 46' 25''E) on 15th rostrum thin and elongate; pronotum, August 2010. We also found this species elongate trapezoidal, lateral angles obtuse. eating a Synophropsis lauri (Horváth, 1897) The coloration varies greatly but is generally (Hemiptera: Auchenorrhyncha: Cicadellidae) cryptic. captured in an insect net in the district Zelus renardii is closely related to Z. Alsoupolis – Olympiako Stadio (38o 2' 10''N, luridus and Z. cervicalis but can be 23o 46' 25''E), between August 2nd, 2011 and distinguished from them by the reddish September 2nd, 2011 (Moulet collection); the pronotum, hemielytra and legs (cf. green in Z. prey was immobilized by the sticky raptorial luridus), apex of femora without a large and forelegs of the assassin bug. This assassin dark ring (cf. present in Z. luridus); and bug was also found in the pinewood outside humeral angles of pronotum obtuse (cf, the Forest Entomology laboratory in the elongate and acute tooth in Z. luridus, at most Institute of Mediterranean Forest Ecosystem with minute subtuberculate process in Z. (37o 58' 30'', 23o 46' 40''; August 29th, 2011). cervicalis) and (length) ≥ 5.8 × (width) in It is assumed that a single generation of males [for an identification key see Hart Z. renardii occurs in Greece because of the 1986; a taxonomic description of the genus extensive sampling effort in Attica (i.e. is urgently needed and is undertaken by G. approximately100 fortnightly inspected traps Zhang under the supervision of C. Weirauch]. all over the year). Biology and Distribution Identification Zelus renardii is a commonly encountered Zelus Fabricius, 1803 (Fig. 1) belongs to the species of Reduviidae throughout its most diverse genus of the family Reduviidae. geographic range (Hart 1986) and is usually It is represented by 60 species widely found in alfalfa, sweetpotato, potato and distributed in the American continent but cotton crops where it preys on all types of with the majority of species having restricted insects, even on intermediate predators distribution (Maldonado 1990). Seven (Rosenheim et al. (1999) for the effect of species are widespread and found both in intraguild predation (IGP) on the introduced North and South America [i.e. cervicalis predator Chrysoperla carnea (Stephens) for Stål, 1872; longipes (Linnaeus, 1767); classical biological control; Müller and minutus Hart, 1987; nugax Stal, 1872; Brodeur (2002) for the effect on biological renardii Kolenati, 1857; tetracanthus Stal, control in conservation; Law and Rosenheim 1862; vespiformis Hart, 1987] (Maldonado (2011) when the intermediate predator is 1990). Geocoris pallens Stål and the herbivore is Some species are known to invade Lygus hesperus Knight; Hemptinne et al. southern biotopes where they can become (2011) when the intermediate predator is a harmful to local insects (Funasaki et al. ladybird beetle) and it frequents the catches 1988, Rosenheim et al. 2004). of sweep nettings. In the source region the This species is recognized by the insect is a sit-and-wait predator and has a following characters: body length 12 – 16 population peak in late summer but smaller mm; cryptozoic coloration; body gracile populations exist in mid-summer (Ali and (thin and slender) with thin and long legs; Watson 1978). The same authors conducted the head is elongate and eyes not prominent; http://epublishing.ekt.gr | e-Publisher: EKT | Downloaded at 29/03/2020 20:50:47 | PETRAKIS AND MOULET: Zelus renardii a new American immigrant in Europe 77 FIG. 1. The insect Zelus reinardii, dorsal view. Discussion laboratory experiments for the determination Mediterranean species of true bugs are of optimal temperature conditions for the repeatedly introduced in northern and mid- development and survival of Z. renardii. The latitude European countries but are usually o o greatest longevity occurs at 25 C but at 20 C go unnoticed, rarely reported in the the survival was substantially high except for literature, and do not often become the first instar for which the survival is 46%. established (Rabitsch 2008). In contrast, the Zelus renardii is able to vary many life cycle Nearctic species Z. renardii originated in parameters and morphometric values such as climatic conditions very similar to the the survival in various temperature regimes northern Mediterranean. As a result it is an and the duration of each instar. invasion risk for European countries. With regard to the classical biological In the invaded region the voltinism of Z. control Reduviidae being polyphagous may renardii has not yet been studied. However, not be useful as controlling agents of specific since the insect was trapped in late August – pest species. However, they are useful in early September it can be speculated that the situations where a variety of pest insect insect has an additional spring generation species exist. In all these situations reduviids (Ali and Watson 1978). The low population in general and Z. renardii in particular are levels are shown by the very low captures of suitable because they can kill significantly the insect in the set of more than one more prey than they can consume (Ambrose hundred fortnightly inspected traps. 2001). A problem that may arise when invading Z. renardii become abundant is phytophagy. http://epublishing.ekt.gr | e-Publisher: EKT | Downloaded at 29/03/2020 20:50:47 | 78 ENTOMOLOGIA HELLENICA 20 (2011): 75-81 When the prey is not enough or it cannot be Chagas disease. However, the research in easily captured the insect switches from these groups is scarce and a review is zoophagy to phytophagy to obtain the urgently needed. In addition haematophagy necessary nutrients (Stoner et al. 1975, evolved independently in different groups of Cohen 1990, Rosenheim et al. 1999, Torres Triatominae together with the fact that a and Boyd 2009). Field observations in switch to this feeding
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