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Abstract
The data originating from six different points of the Hungarian Light Trap Network (1960–2005) were processed for comprehensive examination of the European corn borer's (ECB) (Ostrinia nubilalis Hübner) flight dynamics. The annual flight diagrams were visually assayed. The annual alteration tendency of the quotients of the total trapped individual numbers (Σ), the relative individual number per day (1RIN) and the flight peak (FQ) were examined by means of linear regression analysis. The period and time of the alterations with comparative assay of five consecutive years series of data with Student's t-probe were revealed. Eventually I investigated the effects of annual average temperature on the examined flight parameters with the help of variance analysis. The change of ecology and flight dynamics of the ECB started in the first and extended to the second part of twentieth century is now continuing. This statement has been confirmed by the increasing number of trapped individuals (regression quotient calculated from Σ, etc.: Velence-Sukoró: 65.58; Tarhos: 131). This phenomenon can be best characterised by the appearance and spreading of the second late summer flight peak (average regression quotient calculated from FQ, etc.: 0.082). According to my experiment the gradually increasing temperature and climate play a part in the background of the national flight changes [significant connection between the annual average temperatures of Hungary and Σ (P = 0.021), - 1RIN (P = 0.043)]. The spreading of the bivoltine ecotype can be predicted from these results and the literary data of Hungary.
Acknowledgements
We are indebted to the Central Plant Protection and Soil Conservation Directorate of Central Agricultural Office, Budapest, Hungary for data from light traps.