Spreading examination of European corn borer (Ostrinia nubilalis Hbn.) flight types in the background of Péczely’s climate districts
2006
Keszthelyi, S. | Nowinszky, L. | Puskás, J.
European corn borer (ECB) flight and ecotype spread examinations were made in Hungary with the help of catching results of 44 agricultural Jermy light traps (2004). We wondered about alteration of flight types spread borderline as a function of global climate change. Catching data were evaluated by simple mathematical proportional numbers. Catching results originating from different points of the country were compared with Walter-Lieth climate diagram (2004) and Péczely’s Hungarian climate districts. Latter was to reveal correlations of flight types and different climatic districts.The previously published flight alteration tendency of ECB (Keszthelyi 2003, 2004b) continued in 2004. Generation quotients proved this process too. Average generation quotient of populations in South-eastern Hungary was 6, and the top of the same rate in this district was 10,84. The earlier observed „one peak flight” type was replaced by „two peaks flight” type in North-western Hungary (average generation quotient of this district: 2,5). The 1RIN (relative individual number per one day) shows regressive tendency from South-eastern Hungary to North-western Hungary (1RIN of 1.district: 6,99; 1RIN of 4.district: 4,69; 1RIN of 10.district: 2,78), but unequivocal conclusions cannot be drawn from these values for places of ecotypes. There is no unambiguous connection between Péczely’s Hungarian climate districts and spread of ECB flight types as proved by the statistical examinations.
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