<![CDATA[The white root fungus (WRF) disease caused by Rigidoporus microporus is the main disease that reduce rubber production. The use of biological agents, such as rhizobacteria and botanical fungicide is expected to control WRF disease. The research aimed to determine the potential of rhizobacteria and botanical fungicide with the active compound of citronellal, geraniol, eugenol, and catechin to suppress the growth of R. microporus and control WRF disease. The in vitro studies were conducted at the laboratory of KP. Laing, Solok, whereas in planta tests at rubber plantations in Sijunjung, West Sumatra from April to November 2012. The in planta tests used the factorial designs, which were arranged in a randomized complete block design with 2 factorials and 3 replications. The first factor was 4 treatments, using Bacillus sp. Bc94, Pseudomonas fluorescens Pf55, a combination of Bacillus sp. Bc94 and P. fluorescens Pf55, and without rhizobacteria. The second factor was 3 treatments, using biofungicide formula: formula F1, formula F2, and without botanical fungicide. The parameters assessed were inhibition of R. microporus growth and development of WRF disease. The results showed that Bacillus sp. Bc94, P. fluorescence Pf55 and the combination of citronellal, geraniol, eugenol, and catechin had the highest inhibitions on R. microporus growth: 89.54%, 90.49%, and 81.39%, respectively. The combinations of Bacillus sp. Bc94 and P. fluorescens PF55 with botanical fungicide formulas (F1 and F2) significantly inhibited the WRF disease intensity up to 80.95%–82.91%.]]>
