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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 40 of 332 (0.073 seconds)Spelling suggestions: "subject:"test control"" "subject:"est control""
| 31 |
Biological control of Botrytis cinerea by Bacillus brevis on protected Chinese cabbageEdwards, S. January 1993 (has links)
The activity of <i>Bacillus brevis</i> Nagano and the antibiotic it produces, gramicidin S, against the polyphagous plant pathogen, <i>Botrytis cinerea</i> was studied <i>in vitro</i>. Both germination and growth of <i>B. cinerea</i> were sensitive to the antibiotic although germination was the more sensitive. Sensitivity towards the antibiotic varied with cultural conditions. Treatment of <i>B. cinerea</i> conidia with high levels of gramicidin S caused massive release of cellular ATP indicating membrane disrupton as a primary mode of action. Activity of gramicidin S against conidia of <i>B. cinerea</i> was much lower when applied to leaves of Chinese cabbage compared to <i>in vitro</i>. This reduced activity was thought to be due to the binding of gramicidin S to ethanol soluble component(s) of the leaf surface. Gramicidin S also bound strongly to soil, especially the organic moiety. This gave the antibiotic low mobility and low bioavailability within soil. Methods were developed for the selective retrieval and enumeration of both <i>B.brevis</i> and <i>B. cinerea</i> from plant and soil material. Field trials showed that treatment of Chinese cabbage with <i>B.brevis</i> Nagano was as effective as standard fungicide treatment with iprodione in controlling grey mould infection in two successive field trials. This observation was not expected from the <i>in planta</i> studies concerned with antibiosis since it was indicated that gramicidin S had low activity on leaf surfaces. Observations of leaf wetness duration (LWD) indicated that <i>B.brevis</i> Nagano preparations contained a biosurfactant within the supernatant which altered the wettability of leaves. In greenhouse trials leaves dried 80 percent quicker after irrigation when treated with <i>B. brevis</i> Nagano culture compared to untreated control leaves.
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| 32 |
The tobacco whitefly Bemisia tabaci (Gennadius) : pest and virus vector to agricultureBedford, Ian David January 1998 (has links)
No description available.
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| 33 |
The biology and effects of parasites on the diamond-back moth, Plutella xylostella (L.)Lim, Guan Soon January 1982 (has links)
No description available.
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| 34 |
The pest status of some invertebrate species associated with white clover Trifolium repens LShakeel, Mohammad Arshad January 1986 (has links)
No description available.
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| 35 |
Host effects on interactions with microbial biocontrol agentsSmith, Kevin P. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1997. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Temperature and infection by Metarhizium spp. in the desert locustBath, Abigail Jane January 1997 (has links)
No description available.
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| 37 |
Patterns of parasitism by Trybliographa rapae (Westw.), a cynipid parasitoid of the cabbage root flyJones, Thomas Hefin January 1986 (has links)
No description available.
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| 38 |
Bionomic variation, oviposition strategy and larval competition in West African Bruchid populationsProfit, Michael Alastair January 1997 (has links)
No description available.
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| 39 |
The use of Bacillus thuringiensis (Berliner) for the control of Heliothis armigera (Hubner) (Lepidoptera : Noctuidae) on cottonAston, R. P. January 1989 (has links)
No description available.
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| 40 |
Biology and control of Pheidole megacephala (Hymenoptera: Formicidae, Myrmicinae) especially in relation to use of Ocecophylla longinoda (Formicidae, Formininae) for biological control of Pseudoptheraptus wayi (Herteroptera: Coreidae) in Tanzanian coconutSeguni, Zuberi Singano Kombo January 1997 (has links)
No description available.
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