2-Oxo-carotenoids, 2-Hydroxy-carotenoids, [uC]/?-Carotene, Metabolism, Stick Insects The carotenoids of the stick insect, Ectatosoma tiaratum, were studied by spectroscopic and chemical methods. The /?,/?-type pigments are /?,/?-carotene, /?,/?-caroten-2-one, /?,/?-caroten-2-ol, /?,/?-carotene-2,2'-dione, 2'-hydroxy-/?,/?-caroten-2-one, ß,^-carotene-2,2'-diol, 3,4-didehydro-/?,/?carotene-2,2'-d...

Respiration studies on insects are usually carried out by adapting direct or indirect standard manometric techniques (Umbreit, Burris & Stauffer, 1964). An alternative method, based on the use of an electrolytic respirometer, has been occasionally used (Hebrant, 1970). The respiration of Tenebrioides mauritanicus, a stored product beetle, has been monitored at reduced pressures by the use of a ...

Many insects show a greater attraction to multimodal cues, e.g. odour and colour combined, than to either cue alone. Despite the potential to apply the knowledge to improve control strategies, studies of multiple stimuli have not been undertaken for stored product pest insects. We tested orientation towards a food odour (crushed white maize) in combination with a colour cue (coloured paper with...