Abstract
ABSTRACT . Basal stem rot caused by Phytophthora palmivora .is an important disease of papaya in Indonesia. This research aimed to study the effectiveness of antagonistic bacteria to control root rot on papaya seedlings. This research was conducted in the Laboratory of Center for Tropical Horticulture Studies (PKHT), Bogor Agricultural University. Antagonistic bacterial isolates used were Bacillus cereus G4, Bacillus firmus J8, K1, Pseudomonas diminuta P14, and Pseudomonas aeruginosa PA 2 . Antibiosis ability of all antagonistic bacteria was tested in vitro, by using dual culture test. Bioassay without pathogen inoculation was also performed to study the effect of tested bacteria on growth promotion of papaya seedlings. Effectiveness of five bacteria against basal stem rot was tested in a green house experiment with artificial inoculation of pathogens. Antagonistic bacteria was applied as seed trestment and watering at the rate of 10 5 cfu/ml. All antagonistic bacteria isolates suppressed the disease at the rate of 24.99 – 34.99%. Bacillus cereus G4 and Pseudomonas aeruginosa was able to increase growth of papaya.seedlings. Keyword: biological control, papaya, Bacillus, Pseudomonas, Phytophthora
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