Comparative biology and life table of Habrobracon hebetor (Hymenoptera: Braconidae) on Anagasta kuehniella (Lepidoptera: Pyralidae) at five constant temperatures (original) (raw)
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نامه انجمن حشره شناسی ایران, 2008
The development times and the survival rates of different stages of Habrobracon hebetor Say reared on the last instar larvae of Galleria mellonella (L.) were compared at ten different constant temperatures (16-38 ºC). The development time of immature stages of the parasitoid, H. hebetor, decreased as the temperature increased in the range of 16 to 38 ºC. However, no larvae could survive and develop at 16 ºC. Development time from egg to adult females was the shortest (8.368 ± 0.069 days) at 35 ºC and the longest (32.667 ± 0.33 days) at 18 ºC. Egg incubation period, larval and pupal development times were significantly different at various constant temperatures. No significant difference was found between two sexes in their developmental periods from eggs to adult stage. The survival rate of the egg stage ranged between 94.90 and 100% at all temperature levels, but larval survival rates was significantly different at various temperatures. Although significant difference was found in the survival rate of pupal stage (P < 0.05), the trend of survival rate for pupae was similar to those of larvae. The relationship between temperature and the developmental rate of the parasitoid well described by linear regression model (R 2 = 0.89, P = 0.0001, at the egg stage and R 2 = 0.95, P = 0.0001, at the egg-adult stage). The lowest threshold temperature was obtained for all developmental stages of the parasitoid. Degree-days requirements (DD) for egg, larva, pupa and egg-female stages were 22.73, 56.82, 109.89 and 188.68, respectively. The results in this study showed that the temperature range between 25 and 32 ºC provide a favourable condition for mass rearing of this parasitoid.
Environmental Entomology, 2013
Habrobracon gelechiae Ashmead (Hymenoptera: Braconidae) was studied as a parasitoid of the obliquebanded leafroller, Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae) in California pistachio (Pistacia vera L.) orchards. Ovipositional behavior, adult longevity and fecundity, and the effects of temperature on developmental time and survival were determined. Habrobracon gelechiae develops as a gregarious, ectoparasitic idiobiont on late-instar C. rosaceana larvae. At 25ЊC, adult female wasps survived longer when provided honey and water (35.4 Ϯ 4.9 d) or honey, water, and host larvae (34.4 Ϯ 2.4 d) than when provided water (8.9 Ϯ 1.1 d) or no food (5.9 Ϯ 0.8 d). Over the adult lifespan, females parasitized 20.6 Ϯ 2.1 hosts and deposited 228.8 Ϯ 24.6 eggs. The intrinsic rate of increase was 0.24, the mean generation time was 18.15 d, and the double time 2.88 d. At constant temperatures, H. gelechiae successfully developed (egg to adult) from 15 to 35ЊC. The developmental rate was Þt to a nonlinear model, providing estimates of the parasitoidÕs lower (10.5ЊC), upper (36.0ЊC), and optimal (33.3ЊC) development temperatures. Based on a linear model, 155 degree days were estimated for egg to adult eclosion. Temperature-dependent nonlinear model of survival showed similar shape with the model of development rate. The wasp developed under two diurnal temperature regimes, with 31.0 Ϯ 13.3% survival at low (4 Ð15ЊC) and 63.0 Ϯ 11.4% survival at high (15Ð35ЊC) temperature regimes. The results are discussed with respect to H. gelechiae potential as a parasitoid of C. rosaceana in CaliforniaÕs San Joaquin Valley.
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...
2013
Habrobracon gelechiae Ashmead (Hymenoptera: Braconidae) was studied as a parasitoid of the obliquebanded leafroller, Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae) in California pistachio (Pistacia vera L.) orchards. Ovipositional behavior, adult longevity and fecundity, and the effects of temperature on developmental time and survival were determined. Habrobracon gelechiae develops as a gregarious, ectoparasitic idiobiont on late-instar C. rosaceana larvae. At 25ЊC, adult female wasps survived longer when provided honey and water (35.4 Ϯ 4.9 d) or honey, water, and host larvae (34.4 Ϯ 2.4 d) than when provided water (8.9 Ϯ 1.1 d) or no food (5.9 Ϯ 0.8 d). Over the adult lifespan, females parasitized 20.6 Ϯ 2.1 hosts and deposited 228.8 Ϯ 24.6 eggs. The intrinsic rate of increase was 0.24, the mean generation time was 18.15 d, and the double time 2.88 d. At constant temperatures, H. gelechiae successfully developed (egg to adult) from 15 to 35ЊC. The developmental rate was Þt to a nonlinear model, providing estimates of the parasitoidÕs lower (10.5ЊC), upper (36.0ЊC), and optimal (33.3ЊC) development temperatures. Based on a linear model, 155 degree days were estimated for egg to adult eclosion. Temperature-dependent nonlinear model of survival showed similar shape with the model of development rate. The wasp developed under two diurnal temperature regimes, with 31.0 Ϯ 13.3% survival at low (4 Ð15ЊC) and 63.0 Ϯ 11.4% survival at high (15Ð35ЊC) temperature regimes. The results are discussed with respect to H. gelechiae potential as a parasitoid of C. rosaceana in CaliforniaÕs San Joaquin Valley.
Environmental Entomology, 1996
The relationship between temperature and functional response in Cardiochiles philippinensis Ashmead, a larval parasitoid of the rice leaffolder Cnaphalocrocis medinalis Guenee was examined at 6 temperatures (25, 28, 30, 33, 35, and 40°C), each at 6 host densities (1, 2, 4, 8, 16, and 32 3rd instars per arena). A type II functional response model was fit separately to each temperature; R2 values ranged from 0.74 to 0.93. The highest attack rate was at 28°C; none of the larvae was parasitized at 40°C because the parasitoid was unable to survive. Parasitism increased from 25 to 28°C but was followed by a decrease with increasing temperature. Handling time was fitted as a quadratic function of temperature, whereas search rate was a linear function of temperature.
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...
Journal of Agricultural Science and Technology, 2020
Augmentative release of native natural enemies is a prominent strategy for suppression of crop pests. Intrinsic differences among populations of natural enemies may affect their efficiency in pest management programs. We characterized life history traits of 13 climatically and geographically isolated populations of Habrobracon hebetor Say (Hymenoptera: Braconidae) from different regions of Iran to assess their suitability for biological control of noctuid moths. All experiments were performed at 25±1°C, 65±5 RH and 16:8 (L:D) hours photoperiod regime. Ephestia kuehniella (Zeller) (Lepidoptera: Pyralidae) was used as a laboratory host. Our results revealed significant variation in female longevity, paralysis and parasitism rate, sex ratio, reproductive rate and host allocation among different H. hebetor populations tested. The highest number of offspring (124.2) and parasitized larvae (160.1) were observed in Bandar Lengeh and the lowest ones was observed in Urmia and Jiroft, respect...
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.
Walailak Journal of Science and Technology (WJST)
Habrobracon hebetor has been investigated as a successful biological control agent for larvae of pyralid moths in warehouses. Gaining new information on how to improve the storage procedure of H. hebetor under cold conditions could allow the development of approaches to maintain this parasitoid in pest management programs. This study investigated the effect of cold temperatures (10 and 15 °C) on the development of H. hebetor pupae reared on Corcyra cephalonica, which was kept for up to 3 weeks. Mortality of H. hebetor pupae during cold storage in all treatments was 4 - 19 %. Mortality of H. hebetor adults emerging during cold storage at 10 °C (28 %) and 15 °C (61 %) was significantly observed at 21 days of storage, while other treatments were less than 4 %. Numbers of emerging adults after cold storage from 7 - 14 days were 89 - 96 %, and the female percentage ranged from 13 - 39 %. The number of eggs laid per female from the emerging females after cold storage for 7 - 14 days was n...
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),