Thesis (Ph.D) - University of Birmingham, School of Biological Sciences, Faculty of Science, 1997.
|Statement||by Jonathan Edward Biddulph.|
Black root rot (BRR) caused by the fungus Thielaviopsis basicola is a very persistent and damaging disease for growers of bedding plants, herbaceous perennials and some woody species including poinsettias. This disease is seen most often on pansy, viola, vinca, calibrachoa, petunia and poinsettias. It causes little to no symptoms on some cultivars and [ ]. A pictorial key was developed and the relationship between disease severity (S) and incidence (I) was examined to aid in the assessment of black root rot of pansy caused by Thielaviopsis key consisted of photographs of root segments that represented nine disease severity levels ranging from 1 to 91%. Many annuals and herbaceous perennials are susceptible to species of Phytophthora in greenhouse production and in the landscape.. Annuals that are susceptible to infection by one at least one species of Phytophthora include annual vinca, dusty miller, gerbera daisy, pansy, petunia, calibrachoa, verbena, blue daze, snapdragon, begonia, calendula, annual stock, . between severity and incidence for black root rot of pansy caused by Thielaviopsis basicola. Plant Dis. A pictorial key was developed and the relationship between disease severity (S) and incidence (I) was examined to aid in the assessment of black root rot of pansy caused by Thielaviopsis basi-cola. The key consisted of Cited by: 3.
A pictorial key was developed and the relationship between disease severity (S) and incidence (I) was examined to aid in the assessment of black root rot . Better understanding of the root-zone microflora in relation to Pythium, root rot, plant growth and disease resistance, root mucilages, allelopathic compounds of plant or microbial origin, and other key variables, should be possible with the aid of DNA microarray and other recent technologies to detect major microbial species and genes in the. Pansy and vinca plug infection has resulted in significant plant losses. Symptoms: The black root rot fungus damages the root of the plant, effectively interfering with the root's ability to absorb nutrients. As a result of root injury, plants usually develop symptoms indicative of . Black Root Rot is caused by the fungus Thielaviopsis basicola. The pathogen is found worldwide on more than plant species and it is widespread in both the greenhouse and the landscape environment. Plants can be affected at any growth on: Columbus, OH
BLACK ROOT ROT IN TOBACCO ISSUED: REVISED: J.H. Smiley, William C. Nesmith and Gary K. Palmer Black root rot is an important disease of tobacco in Kentucky, causing estimated annual losses in excess of $6,, It rarely causes spectacular damage in any one burley field since the recommended burley. If black root rot is suspected, a plant diagnostic lab can confirm the presence of Thielaviopsis basicola if black, barrel-shaped spores are seen on the lesions under a microscope. For assistance in identification, contact the C. Wayne Ellett Plant and Pest Diagnostic on: Columbus, OH Challenges of disease assessment and the temporal and spatial aspects of epidemic development are considered, and approaches to root disease management including host resistance, chemical, biological and cultural management are discussed in detail. The book fulfills the needs of researchers, teachers, and practitioners of plant pathology. In the Western Cape Province of South Africa the most serious root disease is black root rot, which causes losses of up to 30%, annually. The aims of this study were to investigate aspects of the etiology and epidemiology of this disease in the Western Cape, and to provide information that can be incorporated in an integrated disease management.