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 17 of 17 for “"cankers"”.
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Information on emergent insect associated tree diseases including epidemiological studies of drippy blight disease of oak and thousand cankers disease of walnut
… complexes called drippy blight and thousand cankers have become injurious to hardwood trees in communities across the urban corridor of Colorado. In order to better understand these disease complexes, studies were initiated to identify the causal agents, symptomology, and epidemiology of …
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Spread of White Hypovirulent Strains of Cryphonectria Parasitica Among American Chestnut Trees at the Lesesne State Forest
Sixty-two natural cankers on branches and main stems of three 16-year-old grafted American chestnut trees at the Lesesne State Forest were sampled for Cryphonectria parasitica. Cankers were sampled in 1996 and 1997 at various distances from the main stem zone on the grafts (ground to 183 cm) that …
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Cultural characteristics, vegetative compatibility, and spatial pattern of white hypovirulent strains of Cryphonectria parasitica on grafted American chestnut trees
In 1982-1983, naturally formed blight cankers, within a zone ranging from the ground to 183 cm on three grafted American chestnut trees, were inoculated with a mixture of four European (white), and six, pigmented hypovirulent strains of Cryphonectria parasitica. A total of 202 C. parasitica …
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Biology of virulent and hypovirulent Endothia parasitica on American chestnut (Castanea dentata)
… sporulating characteristics of biocontrolled H+V cankers. The histopathology of canker development on blight-resistant Chinese and blight-resistant and blight-susceptible American chestnut was examined after inoculation with V and H E-parasitica. Rapid formation and continual growth of mycelial …
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EXOPHYLACTIC AND NECROPHYLACTIC PERIDERM DEVELOPMENT IN AMERICAN BEECH
… coccinea var. faginata was capable of inducing cankers on beech stems when applied to wounds made by the removal of only the first exophylactic periderm. Wounds inflicted and inoculated in the fall resulted in more cankers than those inflicted and inoculated in any other season. All cankers …
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Host-pathogen interactions in a segregating population of BC2F2 hybrid Castanea dentata and other chesnut hybirds after exposure to hypovirus-containing and hypvirus-free strains of Cryphonectria parasitica
… to intermediately resistant. Ep155(CHV1-Ep713) cankers were significantly smaller than cankers caused by Epl55(CHV1-Euro7) and Ep155 (virusfree). Investigation of the interactions of host disease resistance and expression of hypovirulence is currently in progress at the CCTP breeding orchard.
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Population biology of Cryphonectria parasitica infected with Cryphonectria hypovirus 1 on American chestnut trees
… fungus are found to be associated with healing cankers. These European hypovirulent strains are infected with a dsRNA virus, Cryphonectria hypovirus 1 (CHV1), and have a white phenotype when grown in culture. Transmission of CHV1 in C. parasitica is limited by incompatibility between isolates in …
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Relationship of the apple aphis and other insects to the dissemination of fire blight in apple orchards, with a view to methods of blight control
… twigs, fruit-spurs, or water-sprouts. These cankers vary in size from barely visible areas to a girdling of the entire limb; they appear roughened and depressed with a distinct line separating the canker from the apparently healthy tissue. They are called "hold-over cankers." 5. Collar blight …
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Stress Physiology of Phytophthora-canker Pathogens in Landscape Trees: impacts, mechanisms, and mitigation through biochar amendment
… 1) what are the physiological impacts of stem cankers caused by Phytophthora cactorum in Acer rubrum seedlings, 2) if biochar amendment induces resistance to canker causing Phytophthora pathogens and how this resistance is related to the amount of biochar amendment in two common landscape tree …
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Preliminary studies of boxwood blight
… and twigs, a species of Coniothyrium from the cankers on the stems, and a species of Verticillium from the infected roots. Inoculation experiments were performed on healthy young boxwood plants that were growing in the greenhouse. Pure cultures of Fusaria, Coniothyrim, and Verticillium were …
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INTERNAL AUDIT AND CONTROL FUNCTION AND PROCUREMENT FRAUD IN HIGHER EDUCATION INSTITUTIONS: EVIDENCE FROM AN EMERGING ECONOMY
… African countries, which is most affected by the cankers of fraud and corruption. Earlier studies revealed that these menaces are most prevalent in the government sector (National Audit Office, 2016). According to the Auditor General’s report of 2018, procurement fraud tops the list after cash and …
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Developing Novel Management Options for Pear Fire Blight and Apple Bitter Rot with Characterization of Apple European Canker in Virginia
… by Erwinia amylovora and preventing fire blight cankers on pear trees, a two-year evaluation was conducted. The study assessed the efficacy of preventive treatments, including foliar spray and trunk injection applications of Giant Knotweed Extract (RSE) alongside antibiotics. Results highlighted …
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Riparian willow decline in Colorado: interactions of ungulate browsing, native birds and fungi
… is present on a wound, it will form enlarging cankers under a wide range of environmental conditions. Results from my dissertation research support the conclusion that willow decline is more strongly driven by biotic, rather than climatic stressors. This new understanding of the interactions …
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Colorado cytospora canker complex on Populus tremuloides Michx.
… in such diagnostic features. Examinations of cankers on aspen stems in Colorado revealed a morphologically distinct Cytospora-like fungus that frequently co-occurs with C. chrysosperma. This fungus is a new species and is closely associated with and superficially resembles C. chrysosperma. …
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Geospatial Variation of an Invasive Forest Disease and the Effects on Treeline Dynamics in the Rocky Mountains
… tree islands, tended to have more blister rust cankers, and displayed clustered spatial patterns. Undiseased treeline patterns revealed near neighbors smaller in stem diameter and tree island size, and were randomly dispersed. Blister rust diseased whitebark pines reveal spatial autocorrelation, …
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Time series analysis of limber pine (Pinus flexilis) health in the U.S. Rocky Mountains in response to white pine blister rust (Cronartium ribicola) and bark beetles
… infected'. The overall average number of cankers per tree (3.5) was stable, but the number of infected limber pine with a canker in the lower 1/3 of the stem (18%) increased significantly (+4.2%, P = 0.001). When examining all limber pine in the study, 8%, 3% and 3% were killed by …
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Towards the exploitation of the American hazelnut (Corylus americana)
… a scale of 0 (no EFB) to 5 (all stems containing cankers). Results showed that progeny means of the interspecific hybrids ranged from 0.96 to 4.72. Fourteen of the 31 progenies were comprised of at least one-third EFB-free or highly tolerant offspring (i.e., ratings 0 to 2), transmitting a …