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 19 of 19 for “"Host Plant Resistance"”.
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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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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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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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The role of foliar glucosinolates in host plant resistance of oilseed rape and mustard to the Bertha armyworm and the diamondback moth
The relationships between host plant glucosinolates and feeding and growth of a polyphagous insect, the Bertha armyworm, Mamestra configurata Walker and field infestation levels of an oligophagous insect, the diamondback moth, Plutella xylostella L. were investigated. M. configurata reared on eight …
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Control of fusarium head blight in wheat: I. Evaluation of host plant resistance and fungicides II. Molecular markers associated with QTL for resistance
… essential tool for control of FHB. Breeding for resistance to FHB has become a very large part of wheat and barley breeding programs in temperate climates. Various sources of resistance have been used to develop new cultivars that have high levels of resistance. The primary objective of this …
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Introgression of the Genes for Sesquiterpene Carboxylic Acid Synthesis From a Wild Tomato, Lycopersicon Hirsutum, Into the Cultivated Tomato for Increased Host -Plant Resistance to Insect Pests
… SCA levels and the DNA combined of individual plants within the phenotypic classes. Bulk segregant analysis was used to identify polymorphic AFLP markers present in LA 1777 and absent in 'Chico III' and LA 1033. Comparisons of these polymorphic AFLP markers between high-SCA bulks and the …
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Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
… poinsettia, and fiddleleaf fig did not increase plant growth and development parameters such as moisture content (g), plant height (cm), and the number of mature leaves. The results of these studies clearly demonstrate that applications of silicon-based fertilizers to certain plant species …
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Genetic architecture of multiple disease resistance in one maize chromosome segment substitution line population
… and is grown all over the world. Like other 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 …
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Integrated Multiple-tactic Management of the Redbanded Stink Bug on Soybeans in Louisiana
… conducted to determine the combined effects of host plant resistance and insecticide application, on the abundance of stink bugs and their natural enemies. The soybean cultivar Pioneer 95Y20 had the least pest pressure, seed damage, and yields were higher from these plants. Insecticide …
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Biosystematics of the family dactylopiidae (Homoptera: Coccinea) with emphasis on the life cycle of dactylopius coccus costa
… affinities and relationships. Their hosts, natural enemies, distribution, etymology, and role as biological control agents are discussed. For several species many new distribution and host records are given. Also, new types have been designated for some of the species. These included …
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The Spatial and Temporal Distribution and Management of Tomato Bacterial Wilt on Virginia's Eastern Shore
… of this disease in commercial tomato fields. Plants were assessed at approximately one-week intervals throughout the growing seasons and the incidence of bacterial wilt for each individual plant was recorded. A steady increase in both disease incidence and clustered distribution of the disease …
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Soybean Resistance and Defense Responses Against Aphis Glycines
… max (L.) Merrill] in North American since 2000. Host plant resistance is an economical way to control aphids. Soybean resistance against A. glycines was studied by (i) characterizing the antibiosis type of resistance, (ii) mapping the aphid resistance gene(s), (iii) investigating the potential …
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Development of integrated pest management for sugarcane borer, Diatraea saccharalis in rice
… first objective of this research was focused on host plant resistance. For this objective, oviposition preference and larval performance of sugarcane borer on commonly grown rice cultivars in Louisiana were investigated. Results from the oviposition preference study revealed significant …
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Fusarium stalk rot incidence in maize, Zea mays L., in relation to the European corn borer, Ostrinia nubilalis (Hubner) infestation, genotype maturity and eastern Ontario climatic gradient.
… as a worldwide cooperative effort. Some of the host plant resistance to the European corn borer and Fusarium has been attributed to the phytochemical product 6-methoxybenzoxazolinone. However, it has been shown that seasonal weather impacts concurrently on maize development, corn borer and …
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Screening for resistance and identification of tolerance in sugarcane genotypes to spittlebug Mahanarva fimbriolata
Técnicas para a identificação de plantas com resistência, e a acessibilidade a coleções de germoplasma para a procura de fontes de resistência, são condições necessárias para o melhoramento genético visando resistência a insetos. A cigarrinha-das-raízes, Mahanarva fimbriolata (Stål) (Hemiptera: …
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Soybean aphid intra-biotype variability based on colonization of specific soybean genotypes, resistance responses of soybean genotypes to pathogen infection after the application of chemical elicitors, and resistance to charcoal rot identified in ancestral soybean germplasm
… One method for managing this pest is through host plant resistance. Since its arrival in 2000, four aphid biotypes have been identified that are able to overcome soybean aphid resistance (Rag) genes. A soybean aphid isolate collected from Moline, Illinois was not biotype 1 or biotype 2 because …
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Transcriptomic studies of the early stages of potato infection by <i>Phytophthora infestans</i>
… the most destructive pathogen of its solanaceous hosts potato and tomato. It is a threat to global food security and it is therefore important to understand the cellular and molecular dynamics underlying colonisation of its host plants. This greater understanding will inform strategies to improve …
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Genomic and genetic resource for soybean disease resistance improvement
… application of Chromium linked-reads in diploid plant genome de novo assembly. With the growing knowledge of the vital regulatory role of miRNAs in gene expression over the past two decades, there has been great interest to identify both conserved and novel miRNAs in response to environmental …
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Towards the exploitation of the American hazelnut (Corylus americana)
… germplasm for eastern filbert blight (EFB) resistance. EFB, caused by the fungus Anisogramma anomala, is a primary limitation to european hazelnut (Corylus avellana) cultivation in eastern North America. C. americana is the endemic host of A. anomala and, despite its tiny, thick-shelled …