Effect of temperature on some biological and parasitism characteristics of Habrobracon hebetor Say (Hym.: Braconidae) on Anagasta kuehniella (Zeller) (Lep.: Pyralidae) under laboratory conditions

Alikhani, Maryam and Golizadeh, Ali and Hassanpour, Mehdi and Rafiee-Dastjerdi, Hooshang and Razmjou, Jabraeil (2011) Effect of temperature on some biological and parasitism characteristics of Habrobracon hebetor Say (Hym.: Braconidae) on Anagasta kuehniella (Zeller) (Lep.: Pyralidae) under laboratory conditions. Other thesis, University of Mohaghegh Ardabili.

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Abstract

Habrobracon hebetor Say (Hym.: Braconidae) is a gregarious ectoparasitoid of the larval stage of many lepidopterous stored products, mainly in the family Pyralidae. Temperature is an important factor that affects development and ability of parasitoids for control of pests. In this research, functional response as well as life table parameters, were evaluated at four constant temperatures, 20, 25, 30 and 35 °C (±1). Life table parameters were also investigated at 15°C. Adults of H. hebetor were obtained from an insectarium in Dashtnaz and reared on 5th instar larvae of Anagasta kuehniella at 25±1°C, 65±5% RH, and a photoperiod of 16L:8D h. Logistic regression was used to determine the type of functional response and estimate two parameters, attack rate (a) and handling time (Th), in SAS software. The functional response at 25˚C was type III and at 20, 30 and 35˚C was type III. Handling time was significantly different at 25˚C from other temperatures based on coffiedence limits and their overlapping. With increasing temperature from 20 to 35 ˚C, attack rate increased. Handling time was the highest at 25˚C (0.38 h) and the lowest at 30 ˚C (0.06 h). The number of eggs laid per female wasp increased in response to increasing host densities from 2 to 16 larva at 20, 30 and 35 ˚C, and from 2 to 8 larva at 25 ˚C, then decreased as host larvae densities increased at all temperatures. Stable population growth parameters were estimated using Careys procedure. Stable population parameters of H. hebetor such as gross and net reproductive rates, intrinsic and finite rate of increase, generation time and doubling time as well as biological parameters such as fecundity, fertility and longevity were affected significantly by temperature. Development time of immature stages (egg to adult) and longevity of males and females decreased with increasing temperature from 15 to 35 ºC. The survival rate of immature stages varied from 16 to 83% at 15 and 30˚C, respectively. Both the intrinsic rate of increase (rm), and net reproductive rate (R0) was increased as temperature increased from 15-30 ºC and then decreased at 35 ºC. The highest value of these parameters were measured as 0.3115 female/female/day and 85.10 female /female/generation at 30 ºC, respectively.

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