Acanthoscelides macrophthalmus (Schaeffer) (Coleoptera: Chrysomelidae: Bruchinae) hold over high host
specificity to Leucaena leucocephala (Lamark) deWit (Fabales: Fabaceae) at Alexandria (Egypt). The infestation rate of
the seed beetle and its population fluctuation were determined under natural conditions. The rates were low between
February and May 2017, While, it increased and reached a peak in August and decreased in the next January. The
parasitoid Dinarmusacutus (Thompson) (Hymenoptera: Pteromalidae) emerged in August with high numbers and
reached a peak in September, 2017.
The current study recorded A.macrophthalmus as a new host of D. acutus at Alexandria. The average survival rate
of A. macrophthalmus and D. acutus until the death of adults were 30±3 days and 21±3 days, respectively.
This study presented some baseline information regarding the development of A. macrophthalmus that may be
beneficial as a biological control agent of L. leucocephala at Alexandria, Egypt. In contrast, if L. leucocephala was
considered as beneficial tree, the mass rearing of D. acutus should be done to control A. macrophthalmus.