Olfactory host location in beetle bruchid parasitoid Dinarmus basalis (Hymenoptera : Pteromalidae)
The role of chemicals cues in host location by the parasitoid Dinarmus basalis (Rond.) was investigated in bioassays by measuring response to stimuli associated with one of its hosts, the larvae of beetle bruchid, Bruchidius atrolineatus (Pic.) infesting Vigna unguiculata (L. Walp.) seeds. Orientation of parasitoid females was measured in response to stimuli from non host-plants: (Pennisetum typhoides (Burm.) and Sorghum bicolor (L. Moench), host-plant (cowpea) and plant-host complex. The results showed that D. basalis females were not attracted by stimuli from non host-plant but they were significantly oriented towards stimuli emanating from young host plant of V. unguiculata in vegetative stage and host-plant complex. Infested pods were more attractive than the healthy pods.
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Keywords: Bruchidius atrolineatus, chemicals cues, Vigna unguiculata.
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