Studies on Temperature Influence on Oviposition and Development of Immature Stages of the Yam Beetle Dinoderus Porcellus Lesne. Coleoptera: Bostrichidae on Dried Yam Species

Abstract

Teneral adults of Dinoderus porcellus were raised in the laboratory and exposed to various temperature regimes 10 0 C. Egg incubation ranges between 6 to 8 days and there were significance difference (P<0.05) in the developmental period of larva and no significance difference (P<0.05) at the pupal stage. However, developmental period was prolonged on Dioscorea cayenensis as temperature increases.

Storage Insects on Yam Chips and Their Traditional Management in Northern Benin

“…This species which is known to be mostly associated with dried yams [32] has already been reported as the most important pest of stored yam chips in Nigeria [27, 28, 32]. Dinoderus porcellus particularly infests well-dried chips [27, 28].…”

Repellent Effect and Insecticidal Activities ofBridelia ferruginea,Blighia sapida, andKhaya senegalensisLeaves Powders and Extracts againstDinoderus porcellusin Infested Dried Yam Chips

“…The rearing material used is made of plastic containers (19.5 cm height, 6.5 cm diameter). The plastic containers were kept in the laboratory under temperature conditions of 25 ± 2 ∘ C, relative humidity of 70 ± 5%, and photoperiodicity of 12L/12D [5]. The containers were placed on shelves in the laboratory.…”

“…Each plant powder was evaluated at four rates (2,5,7, and 10% w/w) and commercial synthetic insecticide Antouka (Permethrin 3 g/kg + pirimiphos 16 g/kg; DP) included as a positive control. Treated and untreated yam chips (10 g) were alternately placed equidistantly from the center of the circular base [20].…”

“…Unfortunately, dried yam chips in traditional storage systems are severely attacked by the beetle Dinoderus porcellus Lesne (Coleoptera: Bostrichidae) which rapidly reduces yam chips into powder within few days of storage [3,4]. This pest causes heavy qualitative and quantitative losses during storage [2,4,5]. Synthetic insecticides are currently used by farmers to control this pest [2], leading to many cases of food poisoning [6,7].…”

“…For determination of F1 progeny emergence, yam chips were checked for adult emergence 35 days after exposure [5] and every 2 days thereafter. In order to avoid a second generation, the sample inspections continued until no more adults emerged during three consecutive inspections [28].…”