Influence du type de culture et de l'antécédent cultural sur les déplacements des adultes de la Pyrale du Maïs Ostrinia nubilalis
Auteurs : Stockel (Jacques Pierre) et Arnaud (Luc)
Année de publication : 1986
Publication : Entomologia experimentalis et applicata
Volume :
41
Fascicule : 1
Pagination : 45-52
Résumé :
The authors used their light trapping method associated with the release of marked insects. The experiment took place in an agrosystem in Charente (North of Aquitaine [France]) between June 5 and July 15, 1983. The site included four adjoining plots from 1 to 3 ha each: one plot of wheat (previous crop: maize); two plots of maize (previous crop: barley) and a plot of barley (previous crop: wheat). To demonstrate the possible emergence of moths from hibernating larvae, the marked insects (510 .male..male. and 467 .female..female.) were released in the plot of wheat equidistant from the four light traps placed in each plot. The captures of wild insects (1625 .male..male., 786 .female..female.) showed an 8-days protandry and a considerable predominance of males in June/July 1983. This seems to have been caused by their being more mobile than the females. Despite the first males were distributed at random in the different plots, the remainder moved towards the maize. Such behaviour could be associated with that of the females; the latter more very early into the maize and probably lure the males by the release of sex-pheromone. The captures of marked insects (12% of the released population) confirmed the observations obtained with wild insects. The ecological and agronomical consequences of these migrations are discussed. It is suggested that there exists a pattern of two types of movements of European corn borer moths: emergence migration and diurnal migration