Temperature and host density dependent functional response of dinarmus basalis (Hymenoptera: pteromalidae) on callosobruchus chinensis (coleoptera: bruchidae)
Keywords:
Parasitization, Dinarmus basalis, Callosobruchus chinensis, temperature, host density.Abstract
The functional response of Dinarmus basalis Rondani (Hymenoptera: Pteromalidae) were estimated on parasitizing late larval-pupal stages of Callosobruchus chinensis L. (Coleoptera: Bruchidae) a major pest of stored legume over a range of temperatures and host densities. A functional response equation was used in which a quadratic component that included temperature was substituted for handling time. The instantaneous search rate was increased with increasing the temperatures. The searching rate was found the highest at 30°C but the lowest at 20°C. A linear relationship between the parasitization rate and prey density was observed with regression coefficient r2 values lies between 0.951 and 0.997. The model predicts that the maximum number of C. chinensis (333.33) was parasitized per day by an individual D. basalis at 30°C. Handling time Th was the lowest (0.003 minute or 4.32 day-1) at 30°C while the highest (0.010 minute or 14.4 day-1) at 20°C. Therefore, the ability of D. basalis to find and parasitized C. chinensis makes it as a good candidate for biological control in storage conditions.
Bangladesh J. Agril. Res. 48(3): 385-395, September 2023
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