Changing of Flight Phenology and Ecotype Expansion OF THE European Corn Borer (Ostrinia Nubilalis Hbn.) in Hungary

Part 1. Biomathematical evaluation

Abstract

The studies aimed to acquire the widest possible information on the annual flight in Hungary of the European corn borer (ECB), Ostrinia nubilalis Hübner (Lepidoptera: Pyralidae). The investigations used biomathematical (Part 1) and graphical (Part 2) evaluation to document changes in the individual population number.

The study was conducted in Hungary using ECB moth capture records from the Plant Protection Information System black light trap system (1991–2004). We have drawn conclusions on the appearance of annual flights and the tendency of alterations in flight direction by means of light trap results in four different areas in Hungary. We calculated the flight peak quotients, the individual population numbers of the second flight peak, the distinctions of individual numbers of two flight peaks in this part.

As previously published, alterations in flight direction of ECB flights began at different times in Hungary. In the current study, a gradual disappearance of the univoltine ecotype and gradual appearance of the bivoltine ecotype ECB in Hungary is confirmed by the data obtained between 1991–2004. Flight peak quotients and data concerning the second flight peak have confirmed change this process, too: the appearance of a second flight peak in Northwestern Hungary from 1995–1996 (FP = 1.27), the more significant appearance of flights in August in Western Hungary (FP = 1.05) and Northeastern Hungary (FP = 1.45), and a three and four times more individual number of the second flight peak in Southeastern Hungary (FP = 3.44). Flight peak quotients, individual population numbers of the second flight peak, the tendency towards a difference in population number of the two peaks, and size of increase of these values demonstrates the southeastern-northwestern presence of the bivoltine ecotype in Hungary.

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Correspondence to S. Keszthelyi.

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Keszthelyi, S., Puskás, J. & Nowinszky, L. Changing of Flight Phenology and Ecotype Expansion OF THE European Corn Borer (Ostrinia Nubilalis Hbn.) in Hungary. CEREAL RESEARCH COMMUNICATIONS 36, 647–657 (2008). https://doi.org/10.1556/CRC.36.2008.4.14

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Keywords

  • European corn borer
  • flight