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.
Results
Showing 1 to 20 of 37 for “"Dieback"”.
-
Biological Indicators of Forest Dieback
This study involved the determinations of the foliar levels of chlorophyll a and b and metal levels in the year 1, year 2 and year 3 needles of Sitka spruce. A survey was made of nineteen sites in the Afan 1 forest in South Wales. The results obtained indicates that there are two distinct types of …
-
The epidemiology of the ash dieback pathogen, Hymenoscyphus fraxineus, in Northern Ireland
Ash dieback, caused by the fungal pathogen Hymenoscyphus fraxineus, was first identified in Northern Ireland in November 2012. This study, started in autumn 2013, investigated the behaviour of H. fraxineus in Northern Ireland.<br/><br/>H. fraxineus isolates and DNA samples were tested alongside …
-
Causes and ecological consequences of the Spencer Gulf seagrass dieback / Stephanie Seddon.
… the causes and consequences of a sudden dieback of intertidal and shallow subtidal seagrasses along 95 km of the eastern coast of Spencer Gulf, South Australia. Concludes with a conceptual model specific to shallow waters of Spencer Gulf where climatological extremes and geological …
-
Dynamics of forest ecosystem properties and resilience in a temperate woodland undergoing dieback.
… condition were affected in a forest undergoing dieback; 2) to examine the effectiveness of rapid condition assessment tools as a proxy use for inferring woodland resilience; and 3) to determine whether woodland cover influences resilience of EPs at a landscape scale. The changing condition and …
-
Diversity of fungi associated with dieback of Ziziphus Mucronata in Limpopo Province, South Africa
… However, the tree face diseases such as dieback that negatively affect its production and there is little research on diseases of Z. mucronata in South Africa. This study was conducted in Limpopo Province, in three different sites namely Tshikundamalema, Buzzard Mountain Farm and Wits …
-
Growth and dieback of underplanted northern red oak seedlings under various light and moisture conditions
Survival, growth and dieback, endogenous auxin and total non-structural carbohydrate (TNC) relations of underplanted northern red oak (Quercus rubra L.) seedlings were investigated. Greenhouse-grown red oak seedlings were subjected to 0, 63, or 92% shade and soil water potential was permitted to …
-
Site factors determining epiphytic lichen distribution in a dieback-affected spruce-fir forest on Whiteface Mountain, New York
In einem Abies balsamea-Picea rubens-Bestand am Whiteface Mountain im US-Bundesstaat New York wurde die epiphytische Diversität der Flechtenvegetation zwischen gesunden und immissionsgeschädigten Rotfichten (Picea rubens) sowie zwischen Rotfichte und Balsamtanne (Abies balsamea) miteinander …
-
Canopy dieback and decline in pink gums, Eucalyptus fasciculosa, F.Muell in the Mt Lofty Ranges and adjoining plains
… and to distinguish between causes of short-term dieback and long-term decline. I hypothesised that decline in pink gum woodlands was most likely to be because of one or more of the following: (1) long-term and continuous mistletoe infection; (2) declining annual rainfall commencing several …
-
Studies on the fungal diseases of mango with particular reference to diseases caused by Botryosphaeria species
… mostly on the Botryosphaeriaceae associated with dieback disease in Italy and in Egypt. In the present thesis, incorporation of morphology and DNA sequence data of ITS and TEF-1a revealed diverse array of Botryosphaeria spp. associated with mango dieback: Neofusicoccum parvum, N. australe, were …
-
Developing and Assessing Different Cordon Establishment Techniques for Long-Term Vineyard Management
… strangulation resulting from tight wrapping, dieback, and the expression of fungal trunk disease symptoms. Rather than finding strangulation to be a driving force behind dieback, there was actually a trend observed where the cordons displaying the greatest degree of strangulation displayed the …
-
Analysis of symptom expressions and transmission rates caused by the plant pathogen Phytophthora ramorum on native chaparral plants from the genus Arctostaphylos
… causal agent of Sudden Oak death (SOD), ramorum dieback and ramorum leaf blight which affect both forest environments and nurseries. This oomycete pathogen has had a huge economic impact on the nursery and lumber industry. Forests in California have experienced substantial mortality of oaks …
-
Epidemiology and population structure of Xylella fastidiosa, the causal agent of bacterial leaf scorch, among urban trees in the District of Columbia
… of seven tree species. The occurrence of crown dieback was found significantly associated with X. fastidiosa-infection on Q. palustris, Q. rubra, U. americana, and P. occidentalis. A multi-locus sequence typing analysis using 10 housekeeping loci for X. fastidiosa revealed five clonal strains …
-
Long-Term Study of Prescribed Fire Effects on Stand Dynamics and Oak Regeneration Potentials in Degraded Upland Oak-Hickory Stands in Northwestern Arkansas
… onset of the decline, substantial crown dieback and tree mortality, particularly for two red oak species (northern red oak, <em>Quercus rubra</em> Michx. and black oak, <em>Q</em>. <em>velutina </em>Lam.), were observed. In addition, densities of advanced oak regeneration were inadequate …
-
Ecology of box mistletoe Amyema miquelii dispersal in pink gum Eucalyptus fasciculosa woodlands.
… The results support the notion that woodland dieback may improve conditions for mistletoe dispersal by allowing favourable habitat for Mistletoebirds, by increasing canopy access and by providing more perch sites. Dieback will also reduce mistletoe establishment, however, through a loss of …
-
Biodiversity impacts of Chilean needle grass Nassella neesiana on Australia’s indigenous grasslands
… disturbances including T. triandra senescence dieback, mowing and major soil disturbance. Native grasslands in good condition are resistant to invasion.
-
Fidelity versus Scalability: Deep Learning in Forest Remote Sensing
… airborne approach to measuring tree crown dieback and show that when measured end-to-end, the results correlate with ground-based measurements. I use ultra high-fidelity terrestrial LiDAR to derive ground truth annotations for a common intermediate step in such approaches -- aerial instance …
-
Integrative Genomic Approaches for Plant Trait Discovery, Fungal Pathogen Identification and Taxonomy
… sequencing was applied to vascular streak dieback, an emerging disease of woody ornamentals in the U.S., in contexts where culturing is infeasible. Sequencing of 106 samples from 34 host species across seven states identified Ceratobasidium sp. as the only pathogen consistently detected …
Page 1 of 2