The parasitism efficiency of different density leves of Habrobracon hebetor (Say) (Hymenoptera: Braconidae) on different larvae densities of two host species

نازنين, مستقيمي (2009) The parasitism efficiency of different density leves of Habrobracon hebetor (Say) (Hymenoptera: Braconidae) on different larvae densities of two host species. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Abstract: The mill moth, Ephestia kuehniella Zeller and Indianmeal moth, Plodia interpunctella (Hubner) are both important pests of stored products in many countries throughout the world. Harobracon hebetor (Say) wasp is used as a biological control agent of moths larvae in peanut warehouses and packaged cereal products. In this study, the effectiveness of H. hebetor in parasitizing mill moth and Indianmeal moth larvae was evaluated at different host densities in an incubator at 25±1 0C, 65±10 RH, and 14: 10 h (L: D) photoperiod. The results indicated that the highest number of emerged adults wasp were observed at treatments: (1) one pair of wasp - 8 larvae of both hosts; (2) two pairs of wasp - 8 larvae of both hosts and (3) four pairs of wasp - 16 larvae of both hosts.The functional response of H. hebetor to different larvae densities of mill moth and Indianmeal moth was type III. The amount of (b) and handling time (Th) of H. hebetor on larvae of mill moth and Indianmeal moth were calculated 0.248 h-1 and 3.418 h, 0.245 h-1 and 3.427 h respectively. The amount of b and the handling time for the parasitoid at different larvae densities of mill moth was higher than of Indianmeal moth. Increasing the number of egg laid by a female H. hebetor in response to increase in larvae densities of mill moth and Indianmeal moth was nonlinear. The number of eggs laid per female wasp increased in response to increased host densities from 1 to 8 larvae and decreased as host larvae densities increased to 16 and 32. The number of emerged adult wasps also increased at host densities of 1 to 16 larvae and decreased at host densities of 32 larvae per female wasp. The percentage of female wasps emerged and the their survival was proportionaly increased with increased larvae densities of mill moth and Indianmeal moth larvae from 1 to 32 larvae per female wasp.

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