Untersuchungen zum Flug und Flugverhalten von Curculioniden

Investigations on the flight and flight behaviour of curculionids . Detail investigations were made to determine the flight of curculionids using Moericke‐ and window‐traps in an area in middle Hessia. The results show that the main flight period occurs during May and June, although some species fly during late summer and autumn. During the day, most species fly around noon and in the afternoon; flight before 8 a.m. and after 5 p.m. is rare. Night flight was not detected in any species. During the specific flight period, each species has a certain lower temperature threshold. In these investigations the values were 9° C for Rhynchaenus fagi , 10° C for Apion virens and A. flavipes , 15° C for Phyllobius maculicornis and 20° C for Sitona sulcifrons. At temperatures above 27° C a general decrease in flight activity could be stated. The ratio of ♂♂ to ♀♀ was mostly 1:1. In some species, however, greater differences were noticed though in the cultures there were equal numbers of each sex. Catches in yellow Moericke‐traps were nearly four times as great as in blue, green and white ones. Catches in traps at different heights suggested that most curculionids (except Ceutor‐hynchinae ) flew over legume fields at a height of greater than 1 m.