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 20 for “"Foliar disease."”.
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Yield Loss Models for Foliar Diseases of Alfalfa and Evaluation of Chemical and Cultural Disease Control Methods
Regression models relating various measures of disease level to yield were developed for the complex of fungi which cause foliar disease on alfalfa (Medicago sativa). The accuracy and precision of the models was evaluated using data other than those from which the models were constructed. Linear …
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Host range of Septoria glycines, quantification of partial resistance, and brown spot evaluation of soybeans regenerated from calli
… causes brown spot of soybeans. Brown spot is a foliar disease distributed throughout the world. The host range of S. glycines, partial resistance to brown spot in soybean, and brown spot and yield evaluation of soybeans regenerated from calli resistant to a pathotoxin produced by S. glycines …
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Resistance to Walnut Anthracnose Development in Juvenile Leaves of Black Walnut Seedlings
Walnut anthracnose is the most serious foliar disease of black walnut causing premature defoliation and reduced growth. Early studies failed to identify functionally resistant cultivars of balck walnut to this disease. From previous artificial inoculation studies on greenhouse-grown seedlings, …
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Resistance to Fusarium Solani F. Sp. Glycines, the Causal Organism of Sudden Death Syndrome of Soybean
… distribution of the F4 family means based on foliar disease severity ratings resembled a normal distribution and the distribution of means of SIDS response were continuous suggesting that resistance to FSG in PI 522.211 A may be quantitative. The broad-sense heritability estimate for …
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Studies on Soybean Sudden Death Syndrome and Its Causal Organism Fusarium Solani F. Sp. Glycines
… f. sp. glycines and five soybean entries for foliar disease severity ratings. There were no differences in length of tap root lesions, losses in root dry-weight, and vascular stem length discoloration among the five soybean entries. The area under the disease progress curve (AUDPC) value for …
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Effects of Root Characteristics and Deep Tillage on the Development of Sudden Death Syndrome in Soybean
… Fusarium solani f. sp. glycines (FSG) relies on foliar severity ratings as an indication of disease resistance. However, foliar symptom severity does not always correlate well with infection on the root system or with reductions in yield. A combination of root and foliar symptom severity ratings …
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An Evaluation of Unmanned Aircraft Systems' Ability to Assess Stripe Rust in Large Wheat Breeding Nursies
… Rust (Puccinia striiformis f. sp. tritici) is a foliar disease that significantly impacts global wheat production, and resistant cultivars provide the most efficient method of control. High-throughput phenotyping using unmanned aircraft systems (UAS) offers a potentially more efficient method for …
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Simple sequence repeat polymorphism screening for resistance to Cercospora Arachidila in groundnut(Arachis Hypogaea)Genotypes
… resources to counteract the negating effects of foliar disease Early Leaf Spot (ELS) caused by Cercospora arachidicola. C. arachidicola causes yield losses which on interaction with other pests and/ or diseases and favourable weather conditions aggravate yield losses in Sub–Saharan Africa. The …
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Genetic architecture of multiple disease resistance in one maize chromosome segment substitution line population
… plants, maize is attacked by numerous pathogens. Diseases account for 2 to 15% of maize yield losses annually, and foliar diseases are the most destructive in terms of yield. With an increasing world population, utilizing host plant resistance is an environmentally and economically friendly …
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Exploring Interactions of Phyllosphere Epiphytes with Plant Pathogenic Bacteria Pseudomonas and Xanthomonas on Tomato
… for many host plants, however their role in disease control needs to be further investigated. The purpose of this study was to conduct experiments investigating the effectiveness of <em>phyllosphere</em> <em>Methylobacterium</em> and <em>Sphingomonas</em> isolated from red clover against …
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Genetics of partial resistance of wheat to septoria tritici blotch
… fungus Mycosphaerella graminicola, is the major foliar disease of wheat in many countries. Most resistance in wheat cultivars is partial resistance, which is polygenic, or oligogenic and non-specific to particular pathogen genotypes, and hence is durable. Selection for partial resistance to STB …
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Responses of wheat to infection by Mycosphaerella graminicola
… septoria tritici blotch, the most important foliar disease of wheat in Europe. During a compatible interaction, host responses to infection allow the development of necrosis as a form of programmed cell death which appears to aid infection rather than hindering it. Aspects of the response of …
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Genotypic characterization and fungicide resistance monitoring for Virginia populations of Parastagonospora nodorum in wheat
Stagonospora nodorum blotch (SNB), is a major foliar disease of wheat in the mid-Atlantic U.S., is caused by the necrotrophic fungus Parastagonospora nodorum. SNB is managed using cultural practices, resistant varieties, and foliar fungicides. There are increasing trends of severity and incidence …
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Detection of viable urediniospores, morphological characterization in resistant and susceptible genotypes, and germ tube anastomosis of Phakopsora pachyrhizi
… caused by Phakopsora pachyrhizi, is a major foliar disease of soybean affecting soybean yields in many soybean-growing areas throughout the world. After the reports of its first occurrence in Brazil in 2001 and the continental United States of America in 2004, research on the disease and its …
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Physiological, biochemical and molecular aspects of induced resistance in maize against Bipolaris maydis infection using a zinc-polyphenolic compound and silicon
… losses in the growth and yield of maize. Higher foliar concentration of silicon (Si) or the use of resistance inducers may be promising alternatives for boosting maize resistance against MLB. The first study investigated the potential of using Semia® [zinc (20%) complexed with plant- derived pool …
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Characterization of Alternaria alternata isolates causing brown spot of potatoes in South Africa
… spot and black pit of potatoes. Brown spot is a foliar disease with potential to cause 30% yield loss and postharvest losses of up to 10%. Losses are mainly due to premature defoliation. In this study, morphological and epidemiological characteristics of A. alternata were studied in order to …
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Management of stem rot of peanut using optical sensors, machine learning, and fungicides
… rolfsii Sacc.), is one of the most important diseases in peanut production worldwide. Though new varieties with increased partial resistance to this disease have been developed, there is still a need to utilize fungicides for disease control during the growing season. Fungicides with activity …
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The effect of Septoria brown spot on soybean yield and phyllosphere microbiome
… Septoria glycines is the most prevalent soybean foliar disease in Illinois and often co-occurs with other late-season diseases, such as Cercospora leaf blight and frogeye leaf spot. Foliar fungicide applications during the reproductive stage is a common method to control these diseases. However, …
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Evaluation of race population distribution, fungicide sensitivity, and fungicide control of Exserohilum turcicum, the causal agent of northern leaf blight of corn
… by Exserohilum turcicum, is a yield reducing foliar disease common across the north central U.S. Previous race population distribution studies identified five physiological races present in the U.S., prior to 1995. For this study, 156 E. turcicum isolates were screened on corn differential …
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Evaluation of additive and nonadditive genetic variation in elite maize germplasm for root, shoot, and ear characteristics
… ear size, increased nitrogen use efficiency, disease resistance, stalk and root strength, as well as generally improved performance under a range of biotic and abiotic stresses. Ten proprietary and two public inbreds were evaluated with a generation means design emanating from the diallel …