Host-plant finding by the asparagus fly, Plioreocepta poeciloptera (Diptera: Tephritidae), a monophagous, monovoltine tephritid.

The role of various olfactory and visual stimuli was studied in host-plant finding by the asparagus fly Plioreocepta poeciloptera (Schrank), a monophagous monovoltine tephritid causing serious damage to asparagus spears. Volatiles released by asparagus plants were extracted by diethyl ether after cryotrapping concentration, and identified by gas chromatography-mass spectrometry. Twelve of the 13 compounds identified were tested using electroantennography to measure the response of the fly.

Comparison of walking locomotory reactions of two forms ofCallosobruchus maculatus males subjected to female sex pheromone stimulation (Coleoptera: Bruchidae).

A comparison of the walking locomotory reactions of flightless and flight formCallosobruchus maculatus males when subjected to an air current scented with female sex pheromone was undertaken in a tubular olfactometer. The pheromone was delivered to the males either as short pulses or as a continuous flow. To analyze the males' reactions, three behavioral sequences were defined (sequence 1: male sensitivity/arousal; sequence 2: male reactivity; sequence 3; male progression and source location).

Comparison of four populations of Acanthoscelides obtectus (Coleoptera: Bruchidae) from different Colombian ecosystems : Assay of Interpretation.

The bean weevil (Acanthoscelides obtectus) and its preferential host plant Phaseolus vulgaris probably originate from Central or South America. Acanthoscelides obtectus populations have developed for many years in varied and relatively isolated ecosystems in these regions. The influence of the host and of copulation on reproductive activity was studied in four Colombian insect populations from medium (2000 m) and low altitudes (1200 m).