Efficacy of plant extract and silicon amendment on the control of bacterial wilt of tomato under greenhouse condition
2009
Jarujit, J. | Kasitratana, W. | Vajrodaya, S.
Bacterial wilt of tomato caused by Ralstonia solanacearum is one of the most destructive disease in tropical and subtropical areas. The goal for production of tomato in greenhouse with integrated management by plant extract and silicon amendment is an alternative effective management the wilt disease to obtain product with high quality and safety for either consumer and environment. Inhibition of R. solanacearum strains To-Ud3 sup amp by crude extract of Chung Chia (Zanthoxylum sp.) and guava (Psidium guajava) was carried out in laboratory by paper disc diffusion method. Diameter of inhibition zone of R. solanacearum by Chung Chia and guava were 0.52 and 0.43 cm, respectively. Efficacy evaluation of Chung Chia and silicon in the form of salicic acid (Si1) and sodium silicate (Si2) to control bacterial wilt in tomato cv. Seed in greenhouse found that treatment Si1 and Si2 gave the highest of survival rate by 78% whereas control was the lowest of survival rate by 11%. Treatment Si1 provided the highest tomato yield at 150 gm/plant whereas control was only 10 gm/plant. Initial rhizophere population of R. solanacearum was 1.48 x 10 sup 8 cfu/g of soil and gradually decreased every week after treatment. At the eight weeks post inoculation, treatment Si2 had the lowest population of R. solanacearum at 4.72 x 10 sup 2 cfu/g of soil whereas control was the highest R. solanacearum population at 5.72 x sup 2 cfu/g of soil which was significantly different.
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