Abstract
Teneral adults of Dinoderus porcellus were raised in the laboratory and exposed to various temperature regimes 100, 150, 200, 300, 350 and 400 C respectively. Four dried yam species Dioscorea rotundata, Dioscorea alata, Dioscorea dumetorum and Dioscorea cayenensis were used, to determine the effect of temperature on oviposition and developmental stages of the insect. At 100C, there was no oviposition, at 150 C fewer eggs were laid. Oviposition increases with little variation as temperature increases from 200C 300C. There is reduction in the number of eggs laid at 350C , while zero oviposition was recorded at 400 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.
Highlights
Preliminary investigation of insects collected in descending order of frequency in a survey of insect infestation on dried yams, Dinoderus porcellus
This study investigated temperature influence on oviposition and development of immature stages of the yam beetle, Dinoderus porcellus on dried yam species
The mean number of eggs laid in Discorea rotundata showed no significant difference at (P < 0.05) probability level between the temperature ranges of 200C, 250C and 300C while a significant difference occurred between mean numbers of eggs oviposited at 150C when compared to those exposed to higher temperatures
Summary
Preliminary investigation of insects collected in descending order of frequency in a survey of insect infestation on dried yams, Dinoderus porcellus. Porcellus and Rhizoperta dominica Fab was observed as the most abundant in dried yams. Dinoderus porcellus is mainly associated with dried yam and yam products and closely resembles the lesser grain borer Rhizoperta. Dominica in general appearance, biology and habits (Osuji, 1985) Araecerus fasciculatus and. Sitophilus zeamais are reported to be generally associated with many stored products, most especially cereals and grains I. & Lale N.E.S (2002); Zaidi & Singh, 2005; Stoll, 2000; Pedigo and Rice, 2006; Osunde, 2008; Osagie, 1992), Dinoderus porcellus is a major pest in dry yams (Adesuyi, 1997; Osuji, 1980; Oni, 1995)
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