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Control of Solanaceous Bacterial Wilt Disease (Ralstonia Solanacearum) by Reducing the Amount of Initial Inoculum
Abstract:
Bacterial wilt caused by Ralstonia solanacearum is one of the main problems for many crops in tropical and subtropical regions. One of the alternative strategies that can be done to control this bacterial disease is by reducing the amount of initial inoculum. This alternative is carried out by using trap host.
The objective of this research was to know the effectivity of using trap host (tomato plant) in reducing the amount of initial inoculum of R. solanacearum in soil to prevent the bacterial wilt disease and avoid the disadvantages of its effects. This experiment used completely randomized design (CRD) with three factors: age of crop (A), time of pulling out the crop (T), and bacterial concentration (C). There were 36 treatment combinations which were repeated twice.
The results showed that susceptible tomato as trap host could not reduce the amount of R. solanacearum initial inoculum in soil. In soil with C1 initial inoculum (8,778 x 108 colony-forming units (CFU)/dried soil gram), A3T4C1 treatment (three weeks after transplanted to single pot, pulled out seven days after transplanted to an infested pot) could reduce bacterial population to 2,400 x 103 CFU/dried soil gram. In soil with C2 initial inoculum (2,392 x 109 CFU/dried soil gram), A3T3C2 treatment (three weeks after transplanted to single pot, pulled out five days after transplanted to an infested pot) could reduce bacterial population to 9,991 x 103 CFU/dried soil gram. In soil with C3 initial inoculum (2,107 x 1011 CFU/dried soil gram), A3T3C3 treatment (three weeks after transplanted to single pot, pulled out five days after transplanted to an infested pot) could reduce bacterial population to 2,582 x 104 CFU/dried soil gram. All treatments showed that the differences in disease index were not significant.
