Abstract
<p>This research aimed to identify the the potential of <em>Trichoderma</em> isolates in controlling white root disease <em>Rigidoporus lignosus</em> in vitro. <em>Trichoderma</em> isolates were isolated from 7 (seven) smallholder rubber plantations. The locations were Serdang Bedagai, Langkat, Simalungun, Labuhan Batu, Batubara, Asahan and Labuhan Batu districts. The seven <em>Trichoderma</em> isolates were antagonized with <em>Rigidoporus lignosus</em> isolates from 4 (four) smallholder rubber plantations i.e from Serdang Bedagai, Langkat, Simalungun and Labuhan Batu districts. The antagonisme methods used dual culture on Potato Dextrose Agar (PDA) medium. Each <em>Trichoderma</em> isolate had a different potential to inhibit each <em>Rigidoporus lignosus</em> isolate.</p>
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