PERTUMBUHAN BAKTERI Pseudomonas solanacearum E.F. Smith PADA PEMBERIAN EKSTRAK URANG ARING

ABSTRACT Pseudomonas solanacearum is a bacterium that causes wilt disease in tomato, peppers, tobacco, potatoes and Solanaceae plants in general. The bacteria attacks their hosts in nearly all phases of development. Young plants are usually more vulnerable and the bacteria  tends to grow faster. The use of synthetic pesticides for controlling the disease could cause many negative impact on human and environment, Hence,  it is necessary to find an environmentally friendly pesticides for controlling the disease. Urang aring (Eclipta alba L. Hask.) contains  bioactive compounds that  potential to be used as botanical pesticides. This research was conducted to evaluate the effect of ethanol extracts  of urang aring (Eclipta alba L. Hask.) to inhibit the growth of Pseudomonas solanacearum. Bioassay was done by deluting extracts to make concentration 1%, 2%, 3%, 4% (w/v). The result showed that ethanol extracts inhibited the growth of P. solanacearum starting at concentration 1% with inhibition zone diameter 10,7 mm. At level  4% concentration (inhibition zone diameter 17.59 mm) were not significant difference with agrmicyn  0.03%, a synthetical bactericidal with inhibition zone diameter 18,31 cm. The results of this study revealed that urang aring was potential as botanical pesticide. Keywords: Urang Aring, Eclipta alba, Pseudomonas solanacearum