The behaviour of 9 stored product beetles at pitfall trap arenas and their capture in millet |
| |
Authors: | D Obeng-Ofori |
| |
Institution: | (1) International Centre for Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya |
| |
Abstract: | Pitfall trap capture forSitophilus oryzae (L.),S. zeamais (Motschulsky),S. granarius (L.),Tribolium confusum (Duval),T. castaneum (Herbst);Oryzaephilus surinamensis (L.),Cryptolestes pusillus (Schonherr),Rhyzopertha dominica (Fabr.), andProstephanus truncatus (Horn) in millet was assessed by visual and time-lapse video recordings. The behaviour of different beetle species in arenas
containing millet was monitored over 24 h and the frequency of encounters with the trap rim resulting in capture recorded.
The capture efficiency of four types of pitfall traps (i.e. polystyrene, polythene, glass and tin-plated steel can) with rims
exposed or submerged below the millet surface level were compared. Capture was related to beetle size, locomotory rate, and
beetle behaviour at the trap rim as well as trap design and placement. The lighter and smaller species were least captured.
Glass jars were more effective than plastic and metal containers. Traps placed with their rims submerged below the grain surface
level were more efficient than those with rims exposed. Capture rate was unrelated to trap size. The frequency of encounters
with trap rims was not correlated with capture rate. Three types of avoidance behaviours at the trap rims i.e. probing, skirting
and spontaneous retreat, were related to capture rate, spontaneous retreat being the most effective escape mechanism and probing
least. |
| |
Keywords: | avoidance behaviour capture efficiency Coleoptera time-lapse video visual recording |
本文献已被 SpringerLink 等数据库收录! |
|