Streptomyces sp. Sebagai Biofungisida Patogen Fusarium oxysporum (Schlecht.) f.sp. lycopersici (Sacc.) Snyd. et Hans. Penyebab Penyakit Layu Pada Tanaman Tomat (Solanum lycopersicum L.)

A research was conducted to isolate Streptomyces sp. of soil Udayana University campus in the<br />Bukit-Jimbaran, to obtain the most effective Streptomyces sp. which is effective in inhibit the growth of<br />Fusarium oxysporum f.sp. lycopersici, and to test response of tomato plants with Streptomyces sp.<br />culture against Fusarium wilt desease. Implementation phases of the research consisted of isolation and<br />identification of Streptomyces sp, test the inhibition against F. oxysporum f.sp. lycopersici, and in vivo<br />test used by dyeing the roots of the tomato plant (Solanum lycopersicum) with Fusarium spores and<br />after 30 seconds the roots were dyeing Streptomyces culture. Furthermore, sterile soil in polybag<br />watered by Fusarium spores and Streptomyces culture at the same time. Based on morphological<br />characteristic it found five isolates of Streptomyces sp.. The antagonist test showed Streptomyces sp.<br />1 had ability (75%) against Fusarium, Streptomyces sp 2 (68,3%), Streptomyces sp. 3 (71,6%),<br />Streptomyces sp. 4 (63,3%), and Streptomyces sp. 5 (21,6%). All Streptomyces suppressed the<br />growth of Fusarium on tomato plants in glass house (p&lt;0,05). Streptomyces sp.3 suppressed Fusarium<br />wilt disease in tomato from 88% in control to 20%