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Lai R.,Fujian Agriculture and forestry University | Lai R.,Longyan Branch of Fujian Provincial Tobacco Company | Lai R.,Longyan Substation of Fujian Science and Research Institute of Tobacco Farming | Liao L.,Fujian Agriculture and forestry University | And 5 more authors.
Tobacco Science and Technology | Year: 2015

In order to know the spatial distribution of Alternaria alternata (A. alternata) and the damage it caused to flue-cured tobacco of different varieties, field investigation trials were carried out systematically, and its niche characteristics in Longyan tobacco growing areas were analyzed from the points of host niche and spatial niche. The results showed that the host niche breadth of A. alternata was quite large to the trial tobacco varieties with the incidence and disease index niche breadths of 0.918 7 and 0.931 4, respectively. The varieties in the order of resistance against A. alternata were Minyan 35>CB-1>C2>Honghuadajinyuan, which indicated that the germs basically infected all the trial varieties. Moreover, its spatial niche breadth was also large. The varieties in the order of the spatial niche breadth of A. alternata incidence were Minyan 35>C2>Honghuadajinyuan>CB-1, while in the order of the spatial niche breadth of disease index were Minyan 35>CB-1>Honghuadajinyuan>C2. It suggested that the germs could fully occupy the upper, middle and lower parts of tobacco plant and cause damage to whole plant. Knowing the distribution of A. alternata and the resistance of different varieties would be helpful to its effective control. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved. Source


Lai R.,Fujian Agriculture and forestry University | Lai R.,Longyan City Corporation of Fujian Province Tobacco Corporation | Lai R.,Longyan Substation of Fujian Science and Research Institute of Tobacco Farming | You M.,Fujian Agriculture and forestry University | And 7 more authors.
Biocontrol Science and Technology | Year: 2011

Tobacco bacterial wilt, Ralstonia solanacearum, is an important disease affecting the root and stem. The disease causes extensive damage to flue-cured tobacco all over the word. Field trials were conducted in 2008 and 2009 at Longyan, Fujian Province, China, to evaluate garlic intercropping for enhancing the biological control of R. solanacearum in flue-cured tobacco fields. The results of the study demonstrate that tobacco bacterial wilt was clearly inhibited by intercropping garlic in 2008 and 2009. The appearance of the disease in intercropped fields was delayed for about 15 days. The total number of R. solanacearum in root system soils was significantly lower in intercropped fields than in monocultured fields in 2008. These numbers were between 138 × 10 4 and 161 × 10 4 cfu g -1 dry soil in intercropped fields. The corresponding values in monocultured fields were 357× 10 4 cfu g -1 dry soil. The monetary value of tobacco leaves was obviously higher in intercropped fields than in monocultured ones. The per cent increase in monetary values in the intercropped fields was between 14 and 34%. Consequently, intercropping tobacco with garlic might be very useful for enhancing biological control of R. solanacearum in flue-cured tobacco fields. © 2011 Taylor & Francis. Source

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