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First record of Oligosita sanguinea (Girault) (Hymenoptera: Trichogrammatidae) as an egg parasitoid of Hymetta balteata McAtee (Hemiptera: Cicadellidae) in upstate New York.

Key words: wild grape, leafhopper, overwintering egg, natural enemy.

The leafhopper Hymetta balteata McAtee (Hemiptera: Cicadellidae) is a grape-feeding species with a distribution in Central and Eastern USA (Dmitriev and Dietrich, 2007). Although H. balteata is able to feed and possibly reproduce on various Vitis spp., unlike some other leafhoppers, H. balteata is not considered a pest of cultivated grapes in the Finger Lake grape-growing region of Upstate New York or elsewhere. This can be explained perhaps by a combination of factors, such as cultivated grapes, particularly Vitis vinifera, not being the preferred plant host of this leafhopper and the likely good control provided by its natural enemies, particularly egg parasitoids, which has not yet been demonstrated. In Upstate New York, H. balteata is common yet seemingly relatively scarce on wild grape, Vitis riparia, which is integral part of the local native landscape.

In September 2010, authors Triapitsyn and Loeb collected wild grape-feeding leafhoppers in natural areas near the commercial vineyards on both sides of Seneca Lake, which were identified and preserved by author Dmitriev. To determine whether parasitoids attack overwintering eggs of H. balteata, adult leafhoppers were collected by net sweeping V. riparia near Dresden (Yates Co.) at the Keuka Lake Outlet Trail (42[degrees]40'38"N 76[degrees]57'49"W, 152 m) and natural areas adjacent to Doyle Vineyard (42[degrees]41'54"N 76[degrees]9'30"W, 254 m) on 23 September 2010. Three replicates of at least 30 individuals of both sexes were sleeve-caged on second-year growth vines of V. riparia at the Doyle Vineyard forest edge to allow the females to oviposit. After three days, the leafhoppers were collected and preserved for voucher and sleeve cages were removed to allow parasitoids access to the eggs in a natural setting. The cages were marked and left until the next year, when the caged parts of the vines were cut on 20 April 2011 and placed into carton boxes with glass vials screwed into the holes in them. The boxes were stored at Loeb's laboratory in Geneva, New York under a constant light source to attract the emerging parasitoids. The vials were checked daily, and any emerging parasitoids were collected in 80% ethanol, labeled, and sent to Triapitsyn for mounting and identification. Both preserved leafhoppers and parasitoids were deposited at the University of California, Riverside Entomology Research Museum (UCRC).

Within several weeks, two females and two males of the parasitoid Oligosita sanguinea (Girault) (Hymenoptera: Trichogrammatidae) emerged from the overwintered sentinel eggs of H. balteata. The species was described from Illinois as West-woodella sanguinea Girault (Girault, 1911) and later transferred to the genus Oligosita Walker as O. sanguinea (Girault, 1912). Oligosita sanguinea sensu stricto has also been known in the USA from several other states (Peck, 1963), but this is the first record from New York. Several previously reported non-hemipteran host records of O. sanguinea listed by Peck (1963) are clearly incorrect as members of the genus are egg parasitoids of Hemiptera, particularly Cicadellidae (Pinto and Viggiani, 2004). This new, more reliable host record is important for understanding natural components of the vineyard agro-ecosystems in New York that often include neighboring riparian areas frequented by wild grapes, which can serve as reservoirs of both pest and non-pest leafhoppers and their natural enemies.--Serguei V. Triapitsyn, Entomology Research Museum, Department of Entomology, University of California, Riverside, CA. 92521, USA, e-mail: serguei.triapitsyn@ucr.edu; Gregory M. Loeb, Department of Entomology, Cornell University New York State Agricultural Experiment Station, Kennedy Hall, 630 West North Street, Geneva, NY, 14456, USA, e-mail: gruel@ cornell.edu; and Dmitry A. Dmitriev, Department of Entomology, Illinois Natural History Survey, 1816 S Oak St., Champaign, IL, 61820, USA, e-mail: dmitriev@inhs.uiuc.edu.

LITERATURE CITED

Dmitriev, D. A. and C. H. Dietrich. 2007. Review of the New World Erythroneurini (Hemiptera: Cicadellidae: Typhlocybinae). I. Genera Erythroneura, Erasmoneura, Rossmoneura, and Hymetta. Illinois Natural History Survey Bulletin 38(2): i-v + 59 128.

Girault, A. A. 1911. Synonymic and descriptive notes on the chalcidoid family Trichogrammatidae with descriptions of new species. Transactions of the American Entomological Society 37: 43-83.

Girault, A. A. 1912. The chalcidoid family Trichogrammatidae. I. Tables of the subfamilies and genera and revised catalogue. Bulletin of the Wisconsin Natural History Society i0(1-2): 81-100.

Peck, O. 1963. A catalogue of the Nearctic Chalcidoidea (Insecta: Hymenoptera). The Canadian Entomologist, Supplement 30: 1-1092.

Pinto, J. D. and G. Viggiani. 2004. A review of the genera of Oligositini (Hymenoptera: Trichogrammatidae) with a preliminary hypothesis of phylogenetic relationships. Journal of Hymenoptera Research 13(2): 269 294.
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Title Annotation:SCIENTIFIC NOTE
Author:Triapitsyn, Serguei V.
Publication:Entomologica Americana
Geographic Code:1USA
Date:Jan 1, 2013
Words:754
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