Studies on bacterial wilt of tomato
1984
Sutunya Chayachavalit
Isolates of P. solanacearum from tomato, tobacco, potato, sesame , eggplant, chilli and ginger were found to be serologically closely related, although strain specific antigenic reactions are evident. Relationship of the age of tomato plants to the severity of bacterial wilt disease was investigated. Relatively high disease readings were obtained 7 days after the root inoculation to the 5 and 9-12 week-old tomato plants. Relationship between the bacterial concentration and the disease severity was studied with the 9-week old tomato plants. Plants inoculated with an inoculum density at any level from 10 to the fifth to 10 to the ninth cells/ml were severely wilted or dead, 10 days after the inoculation. Tomato plants inoculated with bacterial population of 1 x 10 to the third cells/ml. did not have wilt symptoms even 10 days after the inoculation. Biological control of bacterial wilt of tomato by inoculation with two antagonistic microbial organisms selected for their inhibitory ability against P. solanacearum was investigated. These isolates were strains of Bacillus cereus and Pseudomonas fluorescens. When roots of tomato plants were inoculated, the disease development was slow in the control plants, but, the growth of P. solanacearum was not inhibited. However, populations of P. solanacearum in tomato plants was reduced by inoculation with microbial antagonism
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