Flight assay of the hungarian European corn borer (Ostrinia nubilalis Hübner) populations on the basis of the light traps data

Abstract

The data originating from 6 different points of the Hungarian Light Trap Network (1960-2005) were processed in the quest of the comprehensive examinations of European corn borer’s (ECB) flight dynamics. The annual flight diagrams were assayed visually. 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 the linear regression analysis. The period and time of the alterations with comparative assay of the consecutive 5 years series of data was revealed by Student t-probe. Eventually the effects of annual average temperature on the examined flight parameters were investigated by variance analysis. The change of ecology- and flight dynamics of the ECB started in the first and extended in the second part of XXth century is continouing nowadays too. This statement has been confirmed by the increasing of the trapped individual number (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). The relationship of annual trapped individual number and annual average temperature is proved by variance analysis (P=0,021). According to my experiment the gradually increasing temperature and climate play a part in the backgroung of the national flight changing too. The spreading of the bivoltine ecotype can be predicted from these results and the literary data of Hungary.