Immigration of western corn rootworm ( Diabrotica virgifera virgifera LeConte) adults into first year corn in Somogy county 2004

Keszthelyi, Sándor (2005) Immigration of western corn rootworm ( Diabrotica virgifera virgifera LeConte) adults into first year corn in Somogy county 2004. Cereal Research Communications, 33 (4). pp. 747-754. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Observations of the flight of the western corn rootworm (WCR) were made necessary by its appearance and settling in 2004 and by the possibilities of control. Therefore studies were carried out using Pherocon AM traps in a 111,1 ha maize stand sown after sunflower. The 6 traps were placed at the edge and in the inside of the field, respectively. The influence of the meteorological elements on flight was determined by comparing the temperature and precipitation to the flight of WCR adults.The results obtained with the traps unambiguously pointed to the late summer, one-peak adult flight of the WCR. The rather late mass flight can be attributed to the influence of climatic factors. Toward the end of the vegetation cycle of maize, beside the appearance in high individual numbers (an average of 141 and 142 adults trapped a week) the proportion of gravid females (25–28% on 29 July; 38–42% on 5 August) was found to increase in the area, which forecasts a mass appearance of the next year’s generation. The traps at the edge of the field caught a higher number of adults than those in the inside [averages of the trapping controls for traps at the edge: 3,00 (trap 1.); 2,67 (trap 2.); 3,44 (trap 3.); 2,78 (trap 4), while for the inner traps: equally 4,56 (trap 5.,6.)] Toward the end of flight the difference decreased.

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