Efficacy of Biological Products of Bacillus sp. for Controlling Bacterial Wilt Disease of Turmeric Caused by Ralstonia solanacearum
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Abstract
The bacterial wilt disease of turmeric caused by Ralstonia solanacearum is an important disease with severe economic effects. This research aimed to study the efficacy of Bacillus sp. in controlling bacterial wilt disease in turmeric caused by R. solanacearum. Three isolates of Bacillus sp. namely RUTs001, RUTs002, and RUTs003 were tested in the laboratory using the paper disc diffusion method. Greenhouse experiments involved soaking turmeric rhizomes in Bacillus sp. bioproducts before planting and applying the bioproduct directly to the plant. In laboratory tests, it was found that Bacillus RUTs002 showed the highest efficacy in inhibiting R. solanacearum growth with 85.27% inhibition rate. Furthermore, soaking turmeric rhizomes in Bacillus bioproduct before planting resulted in the lowest disease incidence at 2.08%. On the other hand, pouring the bioproduct of Bacillus RUTs003 around the turmeric plant in green house conditions showed the lowest disease incidence at 52.74%. These results were significantly different (P < 0.01) when compared with the control group (R. solanacearum). The disease incidence occurred at 30.58 and 100%, respectively. Therefore, it is possible to apply bioproducts to control the wilt disease of turmeric in the field conditions.
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King Mongkut's Agricultural Journal
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