OLS is a bacterial disease caused by Xylella fastidiosa. Since then, OLS has been found across the southern United States and was recently reported in Louisiana. fastidiosa grape and pear strains of Taiwan may have evolved independently from each other. Oleander leaf scorch (OLS) is a deadly disease of oleander that was first reported in California in the early 1990s. fastidiosa grape strains but not to the pear strains of Taiwan, suggesting that the X. Results showed that the PD strains of Taiwan were closely related to the American X. fastidiosa strains from different hosts and different geographical areas. ca (coffee leaf scorch or CLS), in Brazil (isolated in 1995 and also pathogenic to Citrus ), Heder helix, Morus rubra, Nerium oleander (oleander leaf. Symptoms of the leaf scorch disease on the leaves of oleander infected by Xylella fastidiosa appearing for the first time in Lebanon were confirmed by ELISA. Phylogenetic analyses were performed by comparing the 16S rRNA gene and 16S-23S rRNA internal transcribed spacer region (16S-23S ITS) of 12 PD strains from Taiwan with the sequences of 13 X. This confirmed PD of grapevines is also the first report from the Asian Continent. Oleander leaf scorch is a lethal disease that is a big problem in southern. The inoculated plants developed typical leaf scorching symptoms, and similar disease severity developed in the three cultivars from which the bacterium was readily re-isolated, proving that the leaf scorch of grapevines in Taiwan is caused by the fastidious X. Koch’s postulates were fulfilled by artificially inoculating two purified PD bacteria to grape cultivars Kyoho, Honey Red and Golden Muscat. sandyi, which cause Pierces disease and oleander leaf scorch, respectively. Diseased tissues were collected from fields for subsequent isolation and characterization of the causal agent of the disease (Xylella fastidiosa). Disease severity in vineyards varied, and all investigated grape cultivars were affected.
Characteristic symptoms of Pierce’s disease (PD) in grapevines (Vitis vinifera L.) were observed in 2002 in the major grape production fields of central Taiwan.
0 kommentar(er)
