Biocontrol activity of endophytic bacteria from cocoa against Phytophthora sp. and Colletotrichum sp.

Cocoa (Theobroma cacao L.) and chili pepper (Capsicum annuum are commonly cultivated by farmers, in some cases, both crops grown together intercropping systems. The main pathogen infected cocoa is the Phytophthora sp. fungus, which causes fruit rot, stem cancer, leaf blight, while Colletotrichum anthracnose plants. ability of endophytic bacteria to inhibit growth fungi bacterial pathogens well known. In this study, biocontrol against fungal was tested, a preliminary test also observed examining their potential inhibition on Chromobacterium violaceum called antiquorum sensing test. Endophytic were isolated from plants, plants that showed symptoms rot anthracnose. A total 34 isolates successfully obtained, with 10 leaves (DK), 12 branches (RK), roots (KA) plant ICCRI 4. Sixteen quorum ability, AHL degradation index ranging 0.44 – 1.56. Antagonistic tests 11 out 16 had strong antibiosis sp., zones 0.6-1.35 cm. Meanwhile, antibiotics clear 0.6 1.1 three best combination C. RK 11, KA 1, 8. [Keywords: antagonist, ahl lactonase, beneficial microorganism]