oa Journal of the Entomological Society of Southern Africa - Field identification of the immature stages of Acanthoplus speiseri Brancsik (Orthoptera: Tettigoniidae, Hetrodinae), a pest of grain crops in Zambia

Volume 55, Issue 2
  • ISSN : 0013-8789



The armoured ground cricket, Acanthoplus speiseri Brancsik, was reared in the laboratory under controlled conditions and its immature stages examined to select features for use in quick identification in the field. There were six nymphal instars. Crosby's rule was applied to the Dyar's ratios calculated from the mean head width measurements of the nymphal ins tars, to test for the possibility of having omitted a developmental stage in the observations. This procedure confirmed the occurrence of only six ins tars in the life cycle of A. speiseri.

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