No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
Fungal diseases of grapevine common on apples?
... Preliminary surveys for pathogens associated with dieback in commercial apple trees (M. domestica) in California have revealed an abundance of E. lata in cankers collected from diseased trees in Mendocino County (10). Other studies in the United States have shown the association of E. lata with a canker disease of M. domestica (12). ...
The means of spread of Eutypa dieback from vine-to-vine within vineyards is likely due to dispersal of sexual spores (ascospores) of the causal fungus, Eutypa lata, based on evidence of distributions of vegetative compatibility groups, reproductive structures (perithecia), and symptoms (2, 6). Asexual spores (conidia) are produced in nature, but are not infectious. Ascospores are released from perithecia following rain and are wind-dispersed. They infect grapevine vascular tissue by colonizing susceptible wounds (e.g., pruning wounds, freeze-damaged tissue). Although it seems clear that ascospores initiate infections of vines, the origin of ascospores that initiate the first infections in a healthy vineyard is not clear. Possible sources include distant vineyards (8), forest trees (10), or apricot orchards (3). To evaluate the relatedness of E. lata populations from vineyards, forests, and apricot orchards, we isolated and characterized nine E. lata-specific microsatellite markers. As numerous Eutypa species infect grapevines, forest trees, and apricots, we also evaluated our markers for E. armeniacae, E. laevata, E. leptoplaca, and E. petrakii var. petrakii. These closely related species are not distinguishable from E. lata in culture, and it is, therefore, critical to ensure that markers will not inadvertently amplify isolates of different species.
... Preliminary surveys for pathogens associated with dieback in commercial apple trees (M. domestica) in California have revealed an abundance of E. lata in cankers collected from diseased trees in Mendocino County (10). Other studies in the United States have shown the association of E. lata with a canker disease of M. domestica (12). ...
Diatrypaceous fungi have been isolated from cankered wood of grapevines (Vitis vinifera) in California. However, the pathogenicity of these fungi and their potential to cause diseases in grapevine was unknown. A series of pathogenicity tests were conducted to determine if these fungi were grapevine pathogens. In all experiments, species of the family Diatrypaceae were re-isolated from the margins of developing lesions, although frequency of re-isolation and average length of vascular discolorations varied among isolates. Cryptovalsa ampelina, Diatrype stigma, and Eutypa leptoplaca were capable of colonizing dormant canes and causing vascular necrosis. Ctyptosphaeria pullmanensis, C. ampelina, D. stigma, Diatrype whitmanensis, and E. leptoplaca infected and caused lesions in green shoots of the new vegetative growth. Diatrype oregonensis and Diatrypella verrucaeformis isolates did not produce lesions that were significantly different from those produced in the control shoots and canes. This suggests that D. oregonensis and D. verrucaeformis fungi may be saprophytic rather than pathogenic to grapevine.
... Preliminary surveys for pathogens associated with dieback in commercial apple trees (M. domestica) in California have revealed an abundance of E. lata in cankers collected from diseased trees in Mendocino County (10). Other studies in the United States have shown the association of E. lata with a canker disease of M. domestica (12). ...
The objectives of this study were to investigate the host range of Eutypa lata in the major grape-growing regions in California and to analyze the phenotypic variation and phylogenetic diversity of E. lata isolates. Perithecia of E. lata were found on grapevines, in apricot, almond, cherry, apple, and pear tree orchards, and on ornamentals (oleander) and native plant species (California buckeye, big leaf maple, and willow). Multigene phylogenies of ribosomal DNA internal transcribed spacer, β-tubulin, and RPB2 genes confirmed the identity of E. lata recovered from the various host plants but also revealed sequence differences among isolates. The intraspecific phylogenetic diversity of E. lata did not correspond to geography or source of isolation, and intraspecific groups were not consistent across the different DNA phylogenies. Significant phenotypic variation also was detected among E. lata isolates, including ascospore and conidium length as well as level of aggressiveness on grapevines. Pathogenicity studies proved that all isolates were infectious to grapevine, suggesting that the native vegetation surrounding vineyards can serve as inoculum sources that may constitute an important element in the epidemiology of Eutypa dieback in grapevines.
ResearchGate has not been able to resolve any references for this publication.