Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"phytophagous"”.
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Enzymatic defenses against plant phototoxins in phytophagous insects
Enzymatic defenses of phytophagous insects against two biosynthetically distinct types of plant phototoxins, furanocoumarins and $\beta$-carboline alkaloid, which are known to produce toxic oxygen species, were studied. Questions raised for the study were (1) Are antioxidant enzyme activity levels …
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Effects of Nutrients and Minerals on Growth and Detoxification in Phytophagous Insects
… vitamins, and minerals can affect the ability of phytophagous insects to utilize a hostplant. One way dietary deficiencies of these compounds may reduce insect performance is by affecting activities of detoxification enzymes, thereby altering susceptibility to host plant allelochemicals. In this …
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Investigations of an Isolate of Bean Pod Mottle Virus From Soybean and Studies of Plant Virus Transmission by Phytophagous Beetles
Made available in DSpace on 2014-12-14T04:37:43Z (GMT). No. of bitstreams: 1 7821011.pdf: 6681195 bytes, checksum: 9f587e9c49a7fe51f0c3f9abe87f6606 (MD5) Previous issue date: 1978
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Experimental and Population Genetic Evidence of Host Race Formation in a Specialized Lycaenid Butterfly
Host-associated differentiation in phytophagous insects is an important mechanism of speciation. The current study investigates whether adaptation to different hosts drives population genetic divergence in the juniper hairstreak butterfly, Mitoura gryneus. Mitoura exhibit host plant fidelity, in …
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Effects of Prior Defoliation on the Timing of Life Cycle Events and Susceptibility to Natural Enemies of a Host Specific Gall-Former
In short lived phytophagous insects specialized to exploit specific plant tissues, phenological synchronization between plant and insect life cycle events is crucial and likely under selection. Here I report on past (1995-2001) and recent (2006-2007) patterns of emergence phenology and survivorship …
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Ceuthorrhynchidius horridus panzer (Coleoptera: curculionidae) -- the host specificity of the first instar, notes on the insect's biology, and methods of adult aestival diapause termination
… economic menace to range and pasture lands. A phytophagous weevil, Ceuthorrhynchidius horridus Panzer has been found to be associated with these weeds in Europe, but cannot be introduced without a comprehensive investigation of its host specificity and biology. First instar host specificity …
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OPTIMIZING THE BIOLOGICAL CONTROL OF INVASIVE INSECTS: EVALUATING NATURAL ENEMY HOST SPECIFICITY, PREY BEHAVIOR, AND VIBRATIONAL COMMUNICATION
… introducing their natural enemies to control the phytophagous populations is an effective and sustainable management strategy for invasive insects. However, biological control can be complex and requires detailed studies on insect ecology. To assess the efficacy, safety, and environmental impact …
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Noise and signal transmission properties as agents of selection in the vibrational communication environment
… (Hemiptera: Membracidae) are host-specific phytophagous insects that communicate by sending vibrations through their host plants. Successful communication depends on the prevailing ecological and environmental conditions, which can affect communication behavior and the evolution of signals …
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Speciation and diversification of the beetle tribe Cratopini on the islands of the South West Indian Ocean area.
… thesis is to examine a spectacular radiation of phytophagous beetles (Curculionidae: Entiminae: Cratopini) that inhabit the islands of the South-Western Indian Ocean. As there are no previous molecular studies of these beetles, it was necessary to take a varied approach that employed both …
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Parallel and Nonparallel Patterns of Genetic Co-Differentiation: Evidence for Host Associated Differentiation Among Trophic Levels of the Oak Gall Wasp System
Populations of phytophagous insects whose life cycles are intimately related to their host plants can express host-associated differentiation (HAD) in the form of genetic divergence and/or RI isolation across alternative host plants. In this work, we ask if HAD cascades to higher trophic levels in …
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A biologically-active pest deterrent: what is the mode-of-action and how does this affect pest behaviour?
… a plant-mediated deterring effect on the phytophagous pest.
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Niche Occupancy, Partitioning, and the Role of Trophic Flexibility in Coexistence of Neotropical Bats
… and omnivory across faunas, particularly phytophagous species. The goal of my dissertation is to understand how ecological forces shape niche occupancy among diverse communities of bats, and to better understand how trophic flexibility enables niche occupancy, partitioning, and coexistence …
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Spruce bark beetle disturbance in the forest-tundra ecotones of southwest Yukon: impacts and predisposing factors
As climate warms, phytophagous forest insects are expected to advance into previously unoccupied regions and/or experience population eruptions within their extant ranges. Already stressed by abiotic factors, arctic and alpine treeline environments will therefore become increasingly vulnerable to …
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Biology and ecology of the predatory mite Iphiseius degenerans (Berlese)(Acari: Phytoseiidae)
… mites are economically important predators of phytophagous mites and insects in greenhouse crops. Mass reared phytoseiid mites are commercially available and used, amongst others, against spider mite and thrips infestations in greenhouse crops. Iphiseius degenerans is used commercially in …
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Neural processing of chemosensory information from the locust legs
Tarsal chemoreceptors in phytophagous insects can provide information on the chemical nature of the leaf surface, and are thus potentially important in host plant discrimination. Ovipositing Pieris brassicae, for example, drum the surface of leaves with their tarsi and tarsal chemoreceptors have …
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Assessing the synergy between the Sterile Insect Technique and Classical Biological Control for sustainable management of the invasive pest Bagrada hilaris (Hemiptera: Pentatomidae)
… biological invasions is largely represented by phytophagous insect pests, which are responsible for global economic losses of at least $70 billion annually. The protagonist of this study, Bagrada hilaris (Burmeister) (Hemiptera: Pentatomidae), in addition to being a pest of cruciferous plants in …
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Exocrine glands in Erotylidae (Coleoptera, Cucujoidea): chemical ecology, morphology and evolution
… 258 genera. Today the family includes both the phytophagous species of the former Languriidae and the mycophagous species of the former Erotylidae s. str. (now ranked as the subfamily Erotylinae). The adult beetles, as well as their larvae, are bounded to different bracket fungi or live under …
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Breeding and dispersal implications for the conservation of the Southern Ground Hornbill Bucorvus leadbeateri
… rapid decline in insect flush, especially in the phytophagous insect groups that form a large part of the ground hornbill diet. Factors to consider when constructing and placing nest boxes include thickness of the cavity walls, entrance height above ground and density of nest boxes placed in the …
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