Aphids (Hemiptera: Aphididae) are considered among the most important pests all around the world. The total number of aphid species recorded in Argentina between 2003 and 2013 has risen from 200 to 237, which demonstrates the continuous introduction and discovery of new species in the territory. Therefore, faunistic studies should be conducted without interruption in areas of interest. The aim of this study was to establish if there were aphid species in Tucuman Province, Argentina that had not been recorded previously in the province. Aphids were collected with modified Moericke yellow water pan traps in potato crops during 2 seasons in 3 regions of Tucumán. Seventeen species, among the 47 species identified, and the genus Illinoia represent new records for the Province.
Aphids are plant-sucking insects that can produce direct damage by feeding on sap and decreasing plant performance or indirect damage by transmitting viruses that affect several crops. The known world fauna of aphids (Aphidinea) recently reached a total of 5,000 species, of which 250 feed on agricultural and horticultural crops throughout the world (Blackman & Eastop 2000).
There have been 336 species of aphids recorded in South America (Ortego pers. comm. 2014) of which 237 are present in Argentina (Nieto Nafría et al. 1994; Ortego et al. 2004; Ortego et al. 2006; Mier Durante et al. 2011; Mier Durante et al. 2012; Ortego et al. 2014). In Tucumán province, located in northwestern Argentina, 64 different species associated with several crops and ornamental plants have been cited (Ovruski de Martínez & Delfino 1990; Nieto Nafría et al. 1994; Ovruski de Martínez et al. 1997). According to Taylor (cited by Cermeli 1987), the species involved in an agro-ecosystem and their densities are highly variable among seasons and locations. For this reason, the aim of this work was to establish if there were aphid species in Tucuman, Argentina, that have not been previously recorded in the Province.
Materials and Methods
Aphid sampling were conducted in potato crops, during the 2010 to 2012 seasons, in 3agro logical regions of Tucumánprovince that have different geographical and climatic characteristics (Alto Verde: S 27°21′ -W 65°40′ O; Tafí del Valle: S 26 54′ -W 65°45′; Las Talitas: S 26°48′-W 65° 12′).
Every week winged forms of aphids were collected with modified Moericke yellow water pan traps (Moericke 1955). Each pan was made of plastic and was slightly smaller (53 × 35 × 11 cm) than the original. Specimens were preserved in 70% ethanol until identification. Several keys were used to identify the species: Remaudière & Seco Fernandez (1990); Blackman & Eastop (2000) and Taylor & Robert (1984), although sometimes only the genera could be determined. The Remaudière, Stroyan & Quednau extended classification (from Nieto Nafría & Colin 2011) is used in this work.
Literature was consulted to determine which of the species collected were cited previously in Argentina and Tucumán Province (Nieto Nafría et al. 1994; Ortego et al. 2004; Ortego et al. 2006; Ovruski de Martínez et al. 1997; Mier Durante et al. 2011; Mier Durante et al. 2012; Ortego et al. 2014). A table was prepared taking into account the following information for each species: Family, subfamily, tribe, valid name, name of author and first report in Argentina. Voucher specimens were slide mounted and deposited in the EEAOC collection.
Forty-seven species among 56 taxa were identified in this work. All of them had already been cited in Argentina in the past, but 17 of them and the genus Illinoia are mentioned for the first time in Tucumán province. All species belonged to the Aphididae family and within it to 4 subfamilies. Aphidinae was the subfamily with the most species, 10 of which belong to the Macrosiphini tribe (Table 1). An annotated list of the species recorded for the first time in Tucumán is given below.
Capitophorus hippophaes (Walker)
This species is recognized among other members of this genus to present swollen siphunculi. In the spring apterae colonize Elaeagnaceae (Elaeagnus spp., Hippophae spp.). They are pale green, slender, with a faint pattern of green spots. Fundatrices are very different; broadly oval, greenish with reddish spots, and their antennae are dark, 5-segmented and have a short processus terminalis. Alatae, produced in the second and third generations, are grayish-green with a black head and thorax, dark antennae, legs and siphunculi and a large quadrate dark green pat