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Background Alloeocranum biannulipes  Montr. and Sign.(Hemiptera: Reduviidae) is a predator present in stored yam chips and a promising biological control agent against  Dinoderus porcellus  Lesne (Coleoptera: Bostrichidae). Numerical responses of  A. biannulipes  to different densities (1, 2, 4, 6, and 8) of  D. porcellus  larvae were evaluated under ambient laboratory conditions (T°: 25 ± 2 °C; RH: 75–80%; photoperiod 12:12 h (L/D)). The number of consumed prey, duration of pre-oviposition and oviposition, number of eggs laid, pre-imaginal development times and mortality rate of the predator were recorded. Results The results revealed that  A. biannulipes  females preying on the highest larval density of  D. porcellus  (8) presented the highest predation rate (4.34 ± 0.18 larvae/predator/day), shortest pre-oviposition period (11.01 ± 0.57 days) and the highest oviposition period (15.83 ± 1.02 days). The daily number of eggs laid by  A. biannulipes  female (y) as a function of the number of  D. porcellus  larvae consumed (x) was modelled by the equation  y  = 0.158 x  2  – 0.4073 x  + 3.8151 ( R  2  = 0.571). The efficiency of prey conversion into eggs of  A. biannulipes  females decreased with increased prey density. The prey density did not affect the hatching rate of  A. biannulipes  eggs and the pre-imaginal development times. However,  A. biannulipes  nymphs fed with more (2 to 8)  D. porcellus  showed a significantly higher survival rate than those fed with a single larva. Conclusions The positive numerical response of  A. biannulipes  suggests that this predator could play a key role in biological control program against  D. porcellus .

journal of basic and applied zoology /journal of basic and applied zoology

Effect of population density on oviposition, development, and survival of Alloeocranum biannulipes (Hemiptera: Reduviidae) preying on Dinoderus porcellus (Coleoptera: Bostrichidae)