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CLIMATE CHANGE AND RANGE SHIFT OF IGUTETTIX OCULATUS Huusela-Veistola, E.1 and Söderman, G.2 1MTT Agrifood Research Finland, Plant Production Research, Finland; 2Finnish Environment Institute, Natural Environment Centre, Biodiversity Unit, Finland E-mail: [email protected] The leafhopper Igutettix oculatus (Lindberg) is a new arrival in Finnish fauna. I. oculatus has adapted to live on lilacs Syringa sp.. The nymphs and adults feed sap on the underside of the lilac leaves and can cause substantial discoloration. Although yellowing of leaves seems to cause no harm to the growth of the lilacs, cosmetic damage and reduction of market value are obvious. I.oculatus originated from the east Palaearctic and has most probably been introduced with lilac plants to Moscow and the St. Petersburg region in European Russia. Its expansion into Finland is likely to be natural. It is first found in Kouvola, south-east Finland, in 1999. Nowadays, it has dispersed to many ornamental gardens in south Finland and is actively spreading onwards. Widening of the distribution area further west- and southward in Europe is quite possible. The future expansion of the leafhopper is not hampered by the host plants, as they are commonly cultivated as garden and park plants. The females oviposit into leaf buds in late autumn and the species hibernates in the egg stage. The nymphs of the first generation occur in early June, and adults in late June and early July. Nymphs of the second generation hatch in the beginning of August, and adults occur from the beginning of September until early October. Only part of the second generation reach adult stage, because many individuals still are in the last nymphal instar at the onset of leaf fall caused by night frosts. Population growth and expansion to the north is limited by early nightfrosts, but along with climate change the pest status and distribution of species could expand. 123 NJF Report • Vol 6 • No 1 • Year 2010 NJF Seminar 430 Climate Change and Agricultural Production in the Baltic SeaRegion - Focus on Effects, Vulnerability and Adaptation Uppsala, Sweden, 4-6 May 2010 Nordic Association of Agricultural Scientists