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Further Studies of Olfaction in Lariophagus Distinguendus Först. (Hym., Pteromalidae)

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1. The females of Lariophagus distinguendus Först. are strongly attracted by the odour of the host during the oviposition period. Their response is obviously stronger than that shown during the pre- or post-oviposition periods. 2. The females of L. distiguendus are affected by the group density of the host. They show a higher level of response to group densities of 20 and 40 individuals. 3. The response of the females of L. distinguendus to the host from which they were reared has been investigated. The differences between the attraction powers exhibited by the five host species Calandra granaria L., C. oryzae L., Stegobium paniceum L., Rhizopertha dominica Fab. and Gibbium psylloides Czemp. are not significant (Fig. 4). 4. While the females of Lariophagus reared from C. oryzae are attracted to the odour of St. paniceum or G. psylloides they still prefer C. oryzae. On the other hand, while the females reared on Stegobium or Gibbium respond very strongly to their scent, they cannot distinguish them from Calandra. The problem of whether Stegobium or Calandra is the normal host of L. distinguendus still remains unsolved.

Affiliations: 1: Entomology Department, Faculty of Science, Ain Shams University, Cairo Abbassieh


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