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 9 of 9 for “"apple scab"”.
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Epidemiological studies on primary inoculum of Venturia inaequalis and V. asperata for apple scab management
Apple scab, caused by the ascomycete Venturia inaequalis, is the most important disease of apple, causing great losses worldwide. Its management is largely based on fungicide treatments, especially targeting ascosporic infections. To reduce the pesticide input, sanitation practices against …
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Physiological and ultrastructural effects of sterol-inhibiting fungicides on apple leaves and the apple scab fungus
… free sterol and free fatty acid composition of apple leaves of Red Delicious and Jonathan cultivars were examiried over a 2 year period. Trees were treated in mornings vs evenings throughout each season and samples collected after 24 and 72 hours after each treatment. Generally, SIFs appeared to …
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DISPERSAL GRADIENTS AND DEPOSITION EFFICIENCY OF VENTURIA INAEQUALIS ASCOSPORES AND THEIR RELATIONSHIP TO LESION DENSITIES (APPLE SCAB DISEASE, SPORE DISPERSAL, TRAPPING)
… sp spores from a point source was examined in an apple orchard. Twenty-five volumetric spore traps were constructed, and a system developed that governed intervals of trap operation by leaf wetness. The estimated inoculum density was equal to several unsprayed trees, much greater than inoculum …
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THE APPLE SCAB DILEMMA: FROM STRATEGIES TO COPE WITH Venturia inaequalis DAMAGES TO THE RISK OF THE EMERGING PATHOGEN Venturia asperata ON RESISTANT APPLE CULTIVARS
Apple scab, caused by Venturia inaequalis, is the most significant disease affecting apple trees. It can negatively impact both plant growth and fruit quality, both in the orchard and during postharvest storage. Various approaches can be employed to mitigate its effects. The experimental activity …
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Development of POMME, the pest and orchard management expert system
… of an expert system to help farmers manage apple orchards is reported. The system provides advice regarding specific pest management, treatment of winter injuries, drought control and general pesticide selection. The knowledge structures employed in the construction of the system are …
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Evaluation of rootstock and crop load effects on the performance of `Gibson Golden Delicious' and three scab-resistant apple cultivars
… the 20th century, Iowa ranked sixth in national apple production. Iowa currently provides about 15 percent of the 1.3 million bushels of fresh apples eaten by Iowans annually (Pirog, 1999) and is ranked at 28th in the nation in production. The reduction in rank was mostly due to the Armistice Day …
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Characterization of Fungicide Resistance in Venturia inaequalis Populations in Virginia
Apple scab (causal organism: Venturia inaequalis) is an economically devastating disease of apples that is predominantly controlled with fungicides. Of the chemical classes currently available, the sterol-inhibiting (SI) and strobilurin (QoI) fungicides are the most commonly used. Recent …
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Pollen Tube Growth Characteristics of Selected Crabapple Cultivars and Managing Apple (Malus x domestica) Crop Load and Early Season Diseases with Organic Bloom Thinning Chemicals
Reducing apple (Malus x domestica Borkh.) crop load during bloom is a reliable option for increasing fruit quality and return bloom. In this thesis, multiple approaches to improving bloom thinning practices are discussed. The first project analyzed the pollen tube growth of several crabapple …