none A study was made to evaluate the relative impact of B. brevicornis Wesmael and its hyperparasitoid, P. bruchicida (Randani) through the population of hibernating larvae of S. cretica Lederer in stacked sorghum stalks. The highest numbers of borer larvae (alive, dead, and/or parasitized) were significantly detected inside the upper third of a given stalk. However, differences between lower and middle sections of a stalk were not significant for the numbers of any type of borer larvae. Parasitoid's females were found to have the ability to forage the borer tunnels in all stalk sections, locate the larvae therein, paralyze and parasitize them. Records on percentages of unknown mortality, parasitism, and total mortality of borer larvae ranged between 9 and 63, 5 and 28 and 14 and 68, respectively. Cocoons' masses of the primary parasitoid were apparently turned black in colour, after hyperparasitoid action. Based on discolouration of cocoons, realitive parasitism per cent of the hyperparasitoid ranged from zero at the onset of the season to 100 per cent at the late of the winter season.