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Showing 1 to 20 of 235 for “"host plant"”.
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Host plant associations and chemical ecology of Cerambycidae
… include some of the most damaging pests of woody plants and invasive species pose a serious threat to North American forests. The beetle family of Cerambycidae is a diverse group whose larvae feed primarily in the woody parts of trees, and many species are important pests in their native regions, …
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Bionomy and host plant finding in oil collecting bees
… interactions between insects and their host plants. It occurs in four floristic regions with about 1800 plant species and 400 bee species involved. The bees collect the fatty oils to provide their offspring and in some cases also to line the walls of their brood cells. The only oil …
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Host plant relationships and chemical communication in the cerambycidae
… cerambycids usually feed on the tissues of woody plants and can be important insect pests, damaging and even killing trees in managed and natural landscapes. In this dissertation, I revise a historical database on associations between the adult beetles and the plant species whose flowers they …
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Host Plant Selection Behavior of Autographa Precationis (Guenee) (Lepidoptera: Noctuidae)
Made available in DSpace on 2014-12-11T18:05:45Z (GMT). No. of bitstreams: 1 7412063.pdf: 8334689 bytes, checksum: 9a311caa947e97be29d9abe2bb586beb (MD5) Previous issue date: 1973
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Host plant resistance and epidemiology of Fusarium ear rot in maize.
… ear rot epidemiology in maize (Zea mays L.) and host plant resistance to Fusarium species causing ear rot, in eastern Canada, through three major groups of experiments. A three-year disease survey that determines the causal agents of maize ear rot in Ontario; a three-year study on the stability …
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Effects of furocoumarin and furoquinoline allelochemicals on host plant utilization by Papilionidae
… skimmianine, both widespread in rutaceous plants, were fed to butterflies in the family Papilionidae. The representative Papilionini, Papilio polyxenes and Papilio cresphontes, ingested the two allelochemicals without detrimental effect while the representative Troidini, Battus philenor, …
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Genetic differentiation of the parasitoid, Cotesia congregata (Say), based on host-plant complex
… have intimate relationships with their host species as well as the plant on which their host develops. Characteristics of both hosts and plants can affect parasitoid success in tri-trophic systems and thus, drive diversification. Genetic differentiation was estimated for Cotesia …
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Strawberry Powdery Mildew Caused by Podosphaera aphanis: Fungicide Resistance and Host Plant Resistance
… affects leaves, fruit, and runners of strawberry plants. Infected leaves have reduced photosynthetic capability and infected fruit become unmarketable. Both of these factors translate to economic loss for the grower and therefore merit taking measures to control the disease. One objective of this …
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Olfactory responses of Dasineura Dielsi Rübsaamen (Diptera: Cecidomyiidae) females to host plant volatiles
… a biological control agent on the invasive alien plant species, Acacia cyclops (Mimosaceae). An investigation was launched to test the following hypotheses: 1) the midges respond to the scent of A. cyclops to locate suitable oviposition sites; 2) the floral scent of A. melanoxylon, A. longifolia …
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Characterization of Host Plant Defense Responses to Parasitization by <I>Orobanche aegyptiaca</I>
<I>Orobanche</I> (spp.) are parasitic plants that attack the roots of many important crops. <I>O. aegyptiaca</I> penetrates the host root (aided by digestive enzymes) and forms connections to the host vascular tissue, from which it will withdraw all of its water and nutrient requirements. In order …
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The nature of host plant recruitment by the sensory repertoire of Sinorhizobium meliloti
… Trigonella. It exists in symbiosis when inside a host plant and will fix gaseous N2 into ammonium for the plant. In return, a population of the bacteria is harbored inside the plant where it can proliferate beyond what would be possible in the rhizosphere or bulk soil. This symbiosis is a defining …
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The Effects Of Clinorotation In The Host Plant, Medicago Truncatula, And Its Microbial Symbionts
… to understand mutualistic relationships between plants and endophytic microbes under the influence of an altered gravity vector. Understanding the outcome of the plant-microbe symbiosis in altered gravity is vital to developing life support systems for long distance space travel and colonization …
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Intraclonal Morphological Plasticity within the Myzus persicae (Sulzer) Complex Related to Host Plant and Temperature
… to investigate the influence of temperature and host plant on the morphology of M. nicotianae and M. persicae. The second objective was to assess Blackman's 1987 key to Myzus for separating tobacco and non-tobacco originating morphs under different environmental conditions. Four host plants were …
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Adaptation to the host-plant, and the evolution of host specialization, in 'cycad weevils' (Coleoptera: Brentidae)
This thesis deals with host relationships in an enigmatic and seemingly primitive group of weevils belonging to the genus Antliarhinus (Coleoptera: Brentidae). These beetles occur only on species of the cycad genus Encephalartos and appear to retain an ancient association with cycads, a group of …
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Host Plant and Spatial Influences on the Natural Enemy Community Structure of a Host Specific Insect Herbivore
… (Hymenoptera: Cynipidae) on the leaves of its host plants across the gall former's geographic range while controlling for spatial autocorrelation among sample sites. Belonocnema treatae exhibits regional host plant specialization across the southern US on three live oak species, Quercus …
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The olfactory basis for attraction of the Bollworm helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) to host-plant flowers
… whether or not olfactory clues play a role in host plant location by the polyphagous moth, Helicoverpa armigera. Volatiles collected from flowers of African marigold, Tagetes erecta, and sweet pea, Lathyrus odouratus, were found to elicit electroantennographic (EAG) responses from the antennae …
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Host plant effects on the biology, behavior and ecology of brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae)
… to be facilitated by the availability of wild host plants near orchards and the high dispersal capacity of adults and nymphs. Interactions between H. halys and its hosts were investigated via laboratory and field experiments. Rearing H. halys nymphs in the laboratory on several of its known …
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Elucidating essential roles of oomycee effector proteins in immune suppression and in targeting hormonal pathways in the host plant
Effector proteins are exported to the interior of host cells by numerous plant pathogens. Effector proteins have been well characterized in bacteria. However, the mechanisms through which these effectors promote virulence are largely unknown. Bioinformatic analysis of genome sequences from oomycete …
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Host Plant Resistance in Strawberries to Anthracnose and Colonization of Crown and Root Tissue by Verticillium dahliae and Macrophomina phaseolina
… roots, crowns and leaves which can result in plant mortality. As much as 50 to 60% mortality can occur in one field. Pathogens responsible for such losses include <em>Colletotrichum acutatum (</em>syn.<em>C. nymphaeae), Macrophomina phaseolina </em>and <em>Verticillium dahliae. </em>With the …
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