Hot air treatment for control of bacterial wilt in ginger root.
Pseudomonas solanacearum [Ralstonia solanacearum], the pathogen causing bacterial wilt in ginger (Zingiber officinale) root, was eliminated when exposed to heat for 30 min at 50°C (122°F) and 45 min at 49° (120°F), respectively. Exposing ginger seed pieces to hot air at 75% RH until their centre temperatures attained 49° (120°F) for 30 and 60 min and 50° (122°F) for 30 min, resulted in minimal injury to the hosts. More than 87% of the seed pieces germinated without adverse effect on growth. Rhizomes harvested from plants grown from seed pieces inoculated with R. solanacearum, and subsequently heat treated with hot air at the above time and temperatures, tested negative for R. solanacearum. Heat treatment with 75% RH heated air may prove to be a convenient method to disinfect ginger seed pieces of the bacterial wilt pathogen.