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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 261 to 270 of 2446 (0.039 seconds)Spelling suggestions: "subject:"“tests”"" "subject:"“pests”""
| 261 |
Pest Problems of the Small GardenVorhies, Charles T., Wehrle, Lawrence P. 06 1900 (has links)
No description available.
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| 262 |
Nondormant Alfalfa Varieties for Arizona 2012Ottman, Michael J. 12 1900 (has links)
2 pp.
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| 263 |
CONTROL OF STRESS SPOT IN SOUTHERN ARIZONA APPLES.Durazo, Jose Uldarico. January 1984 (has links)
No description available.
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| 264 |
EFFECTS OF A SYSTEMIC NEMATICIDE ON THE DEVELOPMENT AND REPRODUCTION OF MELOIDOGYNE INCOGNITALevy, Zuleika Antunes da Silva, 1957- January 1986 (has links)
No description available.
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| 265 |
Influence of diet on nutrition, water regulation and tolerance to insecticides in Heliothis armigera (Hubner) caterpillarsWalker, Andrew Jonathan January 1990 (has links)
No description available.
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| 266 |
The effect of temperature on invasion and pathogencity of entomopathogenic nematodes (nematoda: Rhabditida) to larvae of Galleria mellonella and Otiorhynchus sulcatusSchirocki, Anke Gabriele January 1996 (has links)
No description available.
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| 267 |
The behavioural and environmental bases of gregarization in the desert locust Schistocerca gregaria (Forskaal)Bouaichi, Abdelghani January 1996 (has links)
No description available.
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| 268 |
Strain differentiation in beet yellows virusMoseley, Julie January 1989 (has links)
No description available.
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| 269 |
The identification and use of semiochemicals for the control of the maize weevil, Sitophilus zeamais (Motschulsky) in NigeriaUkeh, Donald A. January 2008 (has links)
Studies were carried out to evaluate the repellent properties of the seeds of alligator pepper, <i>Aframomum melegueta </i>and Black pepper, <i>Piper guineense, </i>and ginger, <i>Zingiber officinale </i>rhizomes against <i>S. zeamais</i>. In 4-way olfactometry bioassays, <i>S. zeamais</i> adults showed strong attraction to maize and wheat seed volatiles but were significantly repelled by odours emanating from the seeds of <i>A. melegueta</i>, <i>P. guineense</i> and <i>Z. officinale</i> rhizomes. In field trials crushed <i>A. melegueta </i>seeds and <i>Z. officinale </i>rhizomes, significantly repelled <i>S. zeamais</i> from traditional maize granaries with treated maize cobs giving higher germination than untreated cobs. Laboratory reproductive potential studies showed that <i>A. melegueta </i>and <i>Z. officinale </i>powders caused significant adult mortality and reproductive potential deterrence against <i>S. zeamais</i> resulting in a reduction in F<sub>1</sub> progeny emergence. Olfactometer bioassays also confirmed that vacuum distilled <i>A. melegueta</i> and <i>Z. officinale </i>extracts and oleoresins were repellent towards adult <i>S. zeamais</i> when tested alone, and in combination with maize grains. Bioassay-guided liquid chromatography of the distillates showed that fractions containing polar compounds accounted for the repellent activity. Coupled gas chromatography-mass spectrometry (GC-MS), followed by GC peak enhancement and enantioselective GC using authentic compounds, identified 3 major compounds in the behaviourally active <i><span style='text-transform:uppercase'>A. melegueta </i>fraction to be (<i>S)</i>-2-heptanol, (<i>S)</i>-2-heptyl acetate and (<i>R)</i>-linalool in the ratio 1:6:3. <i>Z. officinale</i> had 1,8-cineole, neral and geranial in the ratio of 5.48:1:2.13. The identification of these behaviourally active compounds provides a scientific basis for the observed repellent properties of <i><span style='text-transform:uppercase'>A. melegueta </i>and <i>Z. officinale </i>extracts, and demonstrates the potential for their development in stored-product protection at the small-scale level in Africa.
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| 270 |
The extent of damage and reproduction of Tribolium confusum and T. Castaneum in wheat with different moisture contentsDaniels, Norris Eugene. January 1952 (has links)
Call number: LD2668 .T4 1952 D35 / Master of Science
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