Within this temperature range, cadavers resulting from exposure to high dosages of infective juvenile nematodes invariably became fetid and the nematodes failed to develop and reproduce. The unusual lobe-like structures of the head region of an undescribed steinernematid Ql were found to constitute a new genus within the family Steinernematidae. The collection has regularly been enriched by environmental prospection in natural soils in France from technical centers of agriculture GRAB http: In addition, the head region of adult nematodes was examined using a scanning electron microscope in order to differentiate characters of taxonomic importance because there was difficulty in separating many of the nematode strains by other means. For the majority of soil-dwelling insects tested, the infectivity of most of the heterorhabditids was greater than that of the steinernematids. Different strains of the same species were also found to have different temperature limits for development and reproduction. The temperature range of infectivity for insects differed between nematodes of the same genus and between species isolated from the same geographical area.

Steinernematidae ‘, Unspecified thesis, University of Tasmania. There were also substantial differences in the number of infective juvenile nematodes produced per cadaver. Heterorhabditidae and Steinernema spp. For the majority of soil-dwelling insects tested, the infectivity of most of the heterorhabditids was greater than that of the steinernematids. Infective juvenile instar larvae IJs of EPNs of the genera Steinernema and Heterorhabditis collected are identified by molecular approach. Parasitization of an insect occurred in a temperature range that was greater than that permitting nematode development and reproduction but was less than the temperature range of growth for XenoPhabdus spp.

Dl infective juveniles entomopathogenic nematodes thesis not appear to be affected by pH. We would be pleased to hear from the copyright owner s. Downloads Downloads per month over past year. The temperature range of infectivity for insects differed between nematodes of the same genus and between species isolated from the same geographical area.

Entomopathogenic nematodes This Biological Resource Center is entomopathogenic nematodes thesis to bacteria-nematode complexes for insect biocontrol and for discovering new bioactive molecules. Within this temperature range, cadavers resulting from exposure to high dosages of infective juvenile nematodes invariably became fetid and the nematodes failed to develop and entomopathogenic nematodes thesis.

The association of six labial papillae with six lips was found to be characteristic of the genus HetePOPhabditis and the paired structures of the cephalic papillae to be a potentially useful taxonomic character at the species level.

Entomopathogenic nematodes

Copyright the Author – The University is continuing to endeavour to trace the copyright owner s and in the meantime this item has been reproduced here in good faith. The collection has regularly been enriched by environmental prospection in natural soils in France from technical centers of agriculture GRAB http: In a entomopathogenic nematodes thesis between two HetePoPhabditis spp. In contrast, infection of L.

The unusual lobe-like structures of the head region of an undescribed steinernematid Ql were found to constitute a new genus within the family Steinernematidae.

Home page Collections Entomopathogenic nematodes. Infection occurred over a wide range of soil moisture potentials and in a loamy sand, infection occurred at entomopathogenic nematodes thesis potentials equivalent to or below the permanent wilting point of plants pF 4.

Infective juveniles of Entomopathogenic nematodes thesis. In a further comparison of the two genera, the steinernematids were active at lower temperatures and were able to parasitize insects over a greater temperature range.

Steinernematidae ‘, Unspecified thesis, University of Tasmania.

However, the possession of an anterior terminal tooth by Hete1″o1″habditis infective juveniles enabled them entomopathogenic nematodes thesis penetrate the external cuticle of insects. This Biological Resource Center is dedicated to bacteria-nematode complexes for insect biocontrol and for discovering new bioactive molecules. Within the pH range 4. The influence of a number of key environmental entomopathogenic nematodes thesis on the behaviour and survival of various species of the entomopathogenic nematodes of the genera HetePOPhabditis and SteineT’nema was studied in relation to the soil habitat and the presence or absence of the insect host.

MSc Thesis Topic: Entomopathogenic nematodes – WUR

entomopathogenic nematodes thesis For the majority of soil-dwelling insects tested, the infectivity of most of the heterorhabditids was greater than that of the steinernematids. The relationship between developmental rate and temperature was linear. Different strains of the same species were also found to have different entomopathogenic nematodes thesis limits for development and reproduction. Our contribution is focused on the screening of entomopathogenic nematodes able to entomopathogenic nematodes thesis high mortality to different orders of insects targeting pests of importance in agriculture.

In addition, the head region of adult nematodes was examined using a scanning electron microscope in order to differentiate characters of taxonomic importance because there was difficulty in separating many of the nematode strains by other means.

For the first entomopathogenic nematodes thesis, in this area of nematology, theoretical threshold temperatures for development were calculated which gave a close approximation to the observed lower temperature limits for development. By browsing our site you accept the installation and use cookies on your computer. Infective juvenile instar larvae IJs of EPNs of the genera Steinernema and Heterorhabditis collected are identified by molecular approach. Parasitization of an insect occurred in a temperature range that was greater than that permitting nematode development and reproduction but was less than the temperature range of growth for XenoPhabdus spp.

There were also substantial differences in the number of infective juvenile nematodes produced per cadaver.

View statistics for this item. Molyneux, A S’The biology and ecology of the entomopathogenic nematodes, Heterorhabditis spp. The research is focused on the entomopathogenic nematodes thesis, identification and characterization of novel populations of entomopathogenic nematodes isolated and the study of the pathogenic interactions between lepidopteran pests.

However, in general, the temperature range pertaining to the nematodes’ original locality tended to determine entomopathogenic nematodes thesis temperature limits for nematode behaviour. The effect of soil moisture content on the infectivity of Hetepo- 1″habditis sp.

Heterorhabditidae and Steinernema spp.