Habrobracon hebetor Say is an ectoparasitoid of larval stage of various lepidopteran pests. Lethal and sublethal effects of azadirachtin and cypermethrin were. ABSTRACT. Habrobracon hebetor Say (Hymenoptera: Braconidae) is a gregarious ecto-parasitoid that attacks larvae of several species of Lepidoptera, mainly. Abstract. The reproductive performance of the parasitoid Habrobracon hebetor ( Say) (Hymenoptera: Braconidae) against the moths Anagasta kuehniella Zeller.
|Published (Last):||19 November 2006|
|PDF File Size:||2.8 Mb|
|ePub File Size:||3.8 Mb|
|Price:||Free* [*Free Regsitration Required]|
Lethal and sublethal effects of azadirachtin and cypermethrin on Habrobracon hebetor Hymenoptera: Habrobracon hebetor Say is an ectoparasitoid of larval stage of various lepidopteran pests.
Lethal and sublethal effects of azadirachtin and cypermethrin were evaluated on adult and preimaginal stages of H. Contact exposure bioassays with adults indicated that the lethal concentration LC50 of two commercial azadirachtin-containing formulations, NeemGuard and BioNeem, were The LC50 of cypermethrin was 5. When larval stage of H.
To assay the sublethal effects of these insecticides, adult wasps were exposed to an LC30 concentration of the insecticides, and then demographic parameters of the surviving wasps were determined.
Fecundity, fertility, and parameters including the intrinsic rate of increase r m were affected negatively.
The r m values following exposure heberor NeemGuard, BioNeem, cypermethrin, or mock treatment were 0. The current study showed that cypermethrin had more acute toxicity on larval and adult stages of H.
The commercial formulations of azadirachtin and cypermethrin negatively affected most of the life table parameters of the parasitoid. Semifield and field studies are needed for obtaining more applicable results on combining H. Passive vectoring of entomopathogenic fungus Beauveria bassiana among the wax moth Galleria mellonella larvae by the ectoparasitoid Habrobracon hebetor females. Females of the ectoparasitoid Habrobracon hebetor attack and envenomate numerous host individuals during habrobrcon.
The vectoring of the entomopathogenic fungus Beauveria bassiana during the adhesion stage by ectoparasitoid females among the wax moth larvae Galleria mellonella was explored under laboratory conditions. Vectoring occurred both from infected parasitoids to wax moth larvae and from infected to healthy wax moth larvae by parasitoids. The efficacy of vectoring in both cases was dose dependent.
Parasitoid females were unable to recognize habrobbracon larvae in a labyrinth test. In addition, the presence of H. An enhanced germination rate 2 fold was registered in the n-hexane habrobracn extract of envenomated larvae compared to that of healthy larvae.
Both envenomation and mycoses enhanced the phenoloxidase PO activity in the integument of G.
There was a problem providing the content you requested
We hypothesize that changes in the integument property and inhibition of cellular immunity provide the highest infection efficacy of entomopathogenic fungi with H. Non-target toxicity of synthetic insecticides on the biological performance and population growth of Bracon hebetor Say. Bracon hebetor Say Hymenoptera: Braconidae is an important biological control agent of various species of hebetog Lepidoptera and extensively used in biological control program worldwide.
Present study evaluated the lethal and sublethal effects of insecticides on B.
Doses of all the tested insecticides were within a maximum range of their recommended field dosages and adults were treated using residual glass vials method. For control experiments adults were treated with distilled water. Among the tested insecticides, the survivorship of various stages of B. Total immature development time was prolonged in chlorpyrifos and profenofos treated group. It was also observed that chlorpyrifos and profenofos modified the sex ratio, thereby female emergence get reduced.
On the basis of present findings it can be concluded that all tested insecticides caused considerable ecotoxic effects on B. However, comparisons among the tested insecticides on the basis of IOBC criteria showed that chlorantraniliprol and cyntraniliprol was less toxic as compared to other insecticides tested on this biological control agent. Biological responses of Habrobracon to spaceflight.
Since the interaction of the parasitic wasp Habrobracon with the space environment could not be prejudged, we decided to test approximately 30 different parameters of a genetic, mutational, biochemical, behavioral, and physiological character in the one spaceflight we had at our disposal. These parameters were examined at six different exposures of gamma-radiation including 0 dose in flight, resulting in about different endpoints in all.
The most profound effects of spaceflight in conjunction with radiation were decreased hatchability and enhanced fecundity of eggs exposed to spaceflight at different stages of oogenesis.
The interpretation we favor is that these two endpoints are reflections of chromosomal non-disjunction in the former case and inhibition of cell division in the latter. Our most comprehensive study of mutagenesis was on sperm, where dominant lethality, recessive lethality, translocations, and visible mutations were assayed; the only effect found was a threefold enhancement of the recessive lethal mutation frequency in the non-irradiated sperm in the orbited Habrobracon males.
Behavioral and biochemical differences were found. Mating activity of orbited males was severely disrupted and xanthine dehydrogenase activity was sharply decreased in the irradiated flight animals, an unexpected observation. Postflight experiments were like the ground-based control experiments in all aspects but one. Under conditions of vibration similar to those encountered during the launch and re-entry, the mutation frequency in the sperm increased by a factor of three over that of the non-vibrated control.
Kairomonal activities of 2-acylcyclohexane-1,3 diones produced byEphestia kuehniella zeller in eliciting searching behavior by the parasitoidBracon hebetor say. Pyralidae fifth instars acted as arrestment and host-trail following kairomones for the parasitoid,Bracon hebetor Say Hymenoptera: The behavioral response of the parasitoids to the kairomone varied with kairomone concentration and distribution.
However, only small differences in activity were noted for the different mandibular gland components. Females followed trails formed with 2-[ Z,E 12,hexadecadienoyl]cyclohexane-1,3-dione in the same manner exhibited with host-made trails. At concentrations of 1. Biological control of Indianmeal moth Lepidoptera: Pyralidae on finished stored products using egg and larval parasitoids.
habrobracon hebetor hymenoptera: Topics by
Pyralidaein retail and warehouse environments. We examined the potential for using combinations of the egg parasitoid Trichogramma deion Riley Hymenoptera: Trichogrammatidaeand the larval parasitoid Habrobracon hebetor Habrobrafon Hymenoptera: Braconidae for preventing infestations of P. Hebetpr included one or both parasitoids and either cornmeal infested with P. However, when released on bagged cornmeal, T. These findings suggest that, in most situations, a combined release of both T. Modification of fecundity and fertility during oogenesis by.
In Experiment I, adult hebetpr wasps were exposed to ozone for 0, 2, 4, 6, 8, 10, 12, 16, 24, and 27 h. Exposures below 27 h progressively decreased life span with increasing length of exposure. In Experiment II A, adult virgin Habrobracon females were exposed to ozone for 0, 2, 4, 6, 8, 10, 12, 16, and 24 h to determine the effects of ozone on fecundity egg laying ability and fertility egg hatching ability.
All treated wasps showed significant progressive decreases in fecundity and fertility with increases in radiation dose. Together or singly ozone and habrlbracon reduced fecundity and fertility. Results obtained from the cytological study explain the fecundity and fertility observations.
Endophyte-mediated interactions between cauliflower, the herbivore Spodoptera litura, and the ectoparasitoid Bracon hebetor. Fungal endosymbionts in plants may influence interactions among plants, herbivores and their parasitoids through the habdobracon of secondary metabolites.
We used a lepidopteran pest and its generalist parasitoid to test the effect of endophyte-infected plants on a third trophic level. Endophytic fungi, Aspergillus flavus and Aspergillus niger, isolated from Acacia arabica, were used to infect cauliflower plants. We found that the presence of the endophyte in the plants significantly extended the development period of Spodoptera litura Fab.
Feeding of the host on endophyte-infected plants further adversely affected the development and performance of its parasitoid, Bracon hebetor Say. A negative impact was also recorded for longevity and fecundity of endophyte-naive parasitoid females due to the parasitization of host larvae fed on endophyte-infected plants. The presence of endophytes in the diet of the host larvae significantly prolonged the development of the parasitoid.
A strong detrimental effect was also recorded for larval survival and emergence of parasitoid adults. The longevity and parasitism rate of female wasps were reduced significantly due to the ingestion of endophyte-infected cauliflower plants by S. Overall, we found that both endophytic fungi had a negative impact on the parasitoid.
Upregulation of heat shock protein genes by envenomation of ectoparasitoid Bracon hebetor in larval host of Indian meal moth Plodia interpunctella. Effect of envenomation of ectoparasitoid Bracon hebetor was determined on the heart rate and the expression of shsp, hsc70 and hsp90 of the lepidopteran host Plodia interpunctella. Envenomated host larvae were promptly immobilized but heart rate was not changed until 4 days after envenomation.
Northern hybridization showed that each hsp gene was differentially influenced by envenomation: Our results suggest that upregulation of both shsp and hsc70 may produce potent factors that have important roles habrobraxon the mechanism of host-parasitoid relationship. HGD maintains genomic hebetod for 9 bee species, 10 ant species and 1 wasp, including the versions of genome and annotation data sets published by the genome sequencing consortiums and those provided by NCBI. A new data-mining warehouse, Hymenoptera Mine, based on the InterMine data warehousing system, integrates the genome data with data from external sources and facilitates cross-species analyses based on orthology.
All of the genomes and annotation data sets are combined into a single Habrobbracon server that allows users to select and combine sequence data sets to search. Induction of stress- and immune-associated genes in the Indian meal moth Plodia interpunctella against envenomation by the ectoparasitoid Bracon hebetor.
Envenomation is an important process in parasitism by parasitic wasps; it suppresses the immune and development of host insects. However, the molecular mechanisms of host responses to envenomation are not yet clear. This study aimed to gebetor the transcription-level responses of the Indian meal moth Plodia interpunctella against hhebetor of the ectoparasitoid Bracon hebetor.
Quantitative real-time reverse-transcription PCR was used to determine the transcriptional changes of 13 selected genes, which are associated with development, metabolism, stress, or immunity, in the feeding and wandering fifth instar larvae over a 4-day period after envenomation.
The effects of envenomation on the feeding-stage larvae were compared with those of starvation in the transcriptional levels of the 13 genes.
Most selected genes were altered in their expression by either envenomation or starvation. In particular, a heat shock protein, hsp70, was highly upregulated in envenomated larvae in both the feeding and wandering stages as well as in starved larvae.
Further, some genes were upregulated by envenomation in a stage-specific manner. For example, hsp25 was upregulated after envenomation habrobraconn the feeding larvae, but hsp90 and an immune-associated gene, hemolin, were upregulated in the wandering larvae. However, both envenomation and starvation resulted in the downregulation hfbetor genes associated with development and metabolism. This study provides important information for understanding the molecular mechanisms of host responses to parasitism.
Abstract The Afrotropical Cynipoidea are represented by described species and 54 genera in four families: Cynipidae, Figitidae, Liopteridae and Ibaliidae, the latter represented by a single introduced species. Seven of these genera are only represented by undescribed species in the region.