New host plants for Ralstonia solanacearum from India.
Davana (Artemisia pallens) and coleus (Coleus forskohlii) plants, both are important crops in medicinal and aromatic industries in India, were found showing typical wilt symptoms. From these, a tentative diagnosis of R. solanacearum was made as a result of oozing from cut stems placed in water. Morphological characteristics, biochemical, nutritional and pathogenicity tests, including ability to cause wilt on solanaceous and non-solanaceous crops, revealed that the causal agent was R. solanacearum biovar-III. This identification of R. solanacearum is further supported by PCR and serological identification. This is thought to be the first record of R. solanacearum causing bacterial wilt of davana and coleus in India.