Climatically Isolated Populations of Habrobracon hebetor Say (Hymenoptera: Braconidae) Demonstrate Striking Differences in Life History Traits (original) (raw)
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Journal of Economic Entomology, 2021
Habrobracon hebetor (Say) is an important biological control agent for lepidopteran pests of stored products. In this study, the age-specific functional response, paralysis rate, and parasitism rate of H. hebetor under different host deprivation treatments (PC: without host deprivation, used as the control, P1d: host deprivation, but the host was removed after 1 d contact, and PW: host deprivation from beginning) were evaluated at different larval densities (5, 10, 20, 40, and 80) of the Ephestia elutella (Hübner) at 28 ± 1°C, 75 ± 5% RH and 16:8 h L:D. Ages of parasitoid females used were 2, 5, 10, and 20 d old. The logistic regression results indicated that the functional response of H. hebetor females under different host deprivation treatments was type II. The longest handling time was observed in 20-d old females, while the shortest handling time and highest maximum attack rate (T/Th) were estimated at the age of 2 d in all treatments. The paralysis and parasitism rates of H. h...
Annals of the Entomological Society of America, 2006
Demography of Habrobracon hebetor (Say) (Hymenoptera: Braconidae) on two pyralid host species [Galleria mellonella (L.) and Ephestia kuehniella Zeller] (Lepidoptera: Pyralidae) was studied at 28ЊC in the laboratory. Data were analyzed based on an age-stage, two-sex life table, to take both sexes and variable development into consideration. The intrinsic rate of increase (r), Þnite rate of increase (), net reproductive rate (R 0), gross reproductive rate (GRR), and mean generation time (T) of H. hebetor on G. mellonella were 0.1520 d Ϫ1 , 1.1640 d Ϫ1 , 12.5 offspring, 50.1 offspring, and 16.8 d, respectively. These values were not signiÞcantly different from the values obtained for E. kuehniella, i.e., 0.1375 d Ϫ1 , 1.1473 d Ϫ1 , 11.9 offspring, 54.9 offspring, and 18.2 d. The life expectancy of an H. hebetor egg was 10.6 d on E. kuehniella and 10.4 d on G. mellonella. On both host species, the maximum reproductive value of female H. hebetor occurred on the 12th day. KEY WORDS life table, reproduction, stored product pest, parasitoid Habrobracon hebetor (Say) (ϭBracon hebetor) (Hymenoptera: Braconidae) is a cosmopolitan ectopara-sitoid that has been studied as a control agent of various lepidopteran pests in China (Huang 1986),
International Journal of Pest Management, 2017
Habrobracon hebetor Say is an ectoparasitoid that has been used as a control agent of various lepidopteran pests. Temperature-dependent life table and thermal characteristics of H. hebetor are important in understanding the dynamics of host-parasitoid relationships and for optimizing biocontrol programmes. The influence of five constant temperatures (15, 20, 25, 30 and 35 C) on the biology of H. hebetor when parasitizing Anagasta kuehniella Zeller was studied. The survival rate of immature stages increased from 16.67% to 83.81% as temperature increased from 15 to 30 C and then decreased at 35 C. Total development time ranged from 45.70 days at 15 C to 7.10 days at 35 C. The lower temperature threshold for immature stages varied slightly around a value of 11-12 C. The net reproductive rate (R 0) values were significantly different among temperatures and the highest value was found at 30 C (85.10). The high survival rate and net reproductive rate combined with a relatively short generation time at 30 C resulted in the intrinsic rate of increase (r m) being highest (0.312 d ¡1) at this temperature. Considering the acquired results, the temperature range between 25 and 30 C was optimal for H. hebetor.
The reproductive performance of the ecto-larval parasitoid Bracon hebetor Say (Hymenoptera: Braconidae) as well as its host; the olive leaf moth Palpita unionalis Hübner (Lepidoptera: Pyralidae) was studied in the laboratory at 27 ± 2 o C. The P. unionalis is an important pest on olives, and also feeds on other host plants from the family Oleaceae. The estimated life table parameter was the net reproductive rate (R o), the mean generation time (T), the intrinsic rate of natural increase (r m) and the finite rate of increase (λ). This parameter was represented by 68.28, 20.01, 0.15, 1.17 for B. hebetor and 68.54, 32.09, 0.13 and 1.14 for P. unionalis, respectively. Females of the parasitoid lived for 21.8 ±1.97 days. The average number of eggs oviposited by females was 365.6 ±44.94. Immature survival from egg to adult was 41%. Sex ratio of wasp progeny (females/total) was 0.46. P. unionalis females lived on average for 9.10 ±0.35 days and deposited 179.98 ± 22.64 eggs/female. Survival rate for immature was 68%. Sex ratio of progeny was 0.55. The results concluded of this study can be used to improve mass rearing programs and support in oculative release applications of B. hebetor against the olive leaf moth.
Do lepidopteran hosts differentially affect the development and demography of Bracon hebetor Say ?
2017
The present study was aimed to investigate the suitability of various hosts on the development and demography of Bracon hebetor Say (Hymenoptera: Braconidae). The present findings showed that the development of B. hebetor’s immature was significantly prolonged on S. littoralis and S. litura compared to other insect hosts tested. Female of B. hebetor took longer time (23 and 22 days) to lay eggs on C. cephalonica and G. mellonella than other hosts tested. Longevity of male and female was significantly prolonged on C. cephalonica (15.39 and 28.63 days) and G. mellonella (14.21 and 26.57 days) compared to others insect hosts tested. Population growth parameters like Ro, rm, Tc, and τ was considerably highest on C. cephalonica (250.25, 0.3176, 19.30 and 17.39) and lowest on S. littoralis (5.33, 0.1019, 16.49 and 16.43). Based on demographic studies C. cephalonica and G. mellonella were proved to be suitable host for the mass rearing of B. hebetor.
Insects, 2021
Simple Summary This study illustrated the role of optimum temperatures of 25 and 30° in maximizing oviposition by the female H. hebetor. The optimum temperatures for paralysis of P. interpunctella larvae by H. hebetor were shown to be 28 and 30 °C at short exposure periods. However, at long exposure periods, the paralysis rates did not differ significantly. Photoperiod had no impact on oviposition or paralysis of P. interpunctella by the wasp. Abstract Studies were carried out in the laboratory to understand the optimum environmental conditions at which the ectoparasitoid, Habrobracon hebetor Say (Hymenoptera: Braconidae), can paralyze and lay eggs when reared on the larvae of the stored product pest, Plodia interpunctella Hübner (Lepidoptera: Pyralidae). At the four temperatures investigated (20, 25, 30, and 35 °C), optimum temperatures for oviposition were found to be 25 and 30 °C, while 35 °C was the least favorable temperature. No significant differences were found between the p...
Arthropods, 2022
Habrobracon hebetor (Say) (Hymenoptera: Braconidae) is one of the most important biocontrol agents of insect pests in conducting IPM programs. In the present study, the effect of successive mass rearing by several generations on some biological parameters of H. hebetor was studied under laboratory conditions (28±2oC, R.H. 65±5 % & L:D (16:8)). The results of the analysis of variance showed that continuous rearing in different generations had a significant effect on all parameters (p<0.05). Eighth generation (G8) had the longest preadult stages longevity and the percentage of sex ratio with averages of 12.14 days and 66.48 (female / female+male), respectively. The longest oviposition period and highest female longevity with the averages of 18.88 and 21.88 days, respectively, was observed in the ninth generation (G9). The highest percentage of larval and pupal mortality was observed in the G1 with averages of 1.20 and 10.83%, respectively. The results also showed that the highest number of eggs laid (fecundity), pupal hatching, daily parasitism, and paralysis of larvae with averages of 14.24 eggs per female, 99.56%, 3.98 larvae, and 59.8 larvae, respectively, belonged to the fifth generation (G5). Finally, the results showed that mass rearing in continuous generations affected the biological parameters of H. hebetor and the fifth generation (G5) had the highest quality compared to other generations.
APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY, 2011
A study was conducted to compare the biological attributes of three different populations of Habrobracon hebetor Say collected from Chegeni, Gerit and Alashtar, in Lorestan province, Iran. The experiments were performed using fifth instar larvae of Ephestie kuehniella as host under laboratory conditions at temperature 28 o C, a photoperiod of 16: 8 (L: D) h, and 60±5% RH. Total developmental time of Chegeni, Gerit, and Alashtar populations were 8.87, 9.17, and 8.38 days, and the values of life expectancy were 24.12, 29.85, and 35.12 days, ...
Using Habrobracon hebetor Say is an alternative solution for sustaining the fight against the borer millet. For a very long time, the mating of this parasitoid has posed methodological difficulties because it has to go through good synchronization with its surrogate host. In this study, the breeding of H. hebetor in real environment was carried out in three different breeding structures. The data were analyzed under Statview.rar. In general, male dominance over females is observed throughout the duration of the experiment. The comparison of the means according to breeding structures showed a dominance of adults emerged in hangar (90.8 ± 20.70) compared to other breeding structures. Thus over 96% of adults of H. hebetor have emerged in hangar against only 90% in the final material. Taking into account gender, it is clear from results found that sex is in favor of females in a shed and in favor of males under house of mud and solid materials. It appears that hangar farming can be a good place for mass breeding of H. hebetor. Depending on its surrogate host, the results seem to show that the higher the number of C. cephalonica, the more adults of H. hebetor increase. All these results constitute a good indicator for the technical services for a better management of the mass farms of H. hebetor.