Penelitian

BDB – Chromolaena

POTENTIAL OF CHROMOLAENA ODORATA AS BIOPESTICIDE FOR CONTROLLING BLOOD DISEASE BACTERIUM, THE CAUSAL AGENT OF BANANA BACTERIAL WILT

 Radix Suharjo & Titik Nur Aeny

ABSTRACT

This study was performed to investigate potential of extract of Chromolaena odorata (siam weed) as a biopesticide for controlling Blood Disease Bacterium (BDB), the causal agent of banana bacterial wilt in Indonesia. The study was conducted from November 2007 to May 2008 in the Plant Disease Laboratory Faculty of Agriculture University of Lampung. Investigation was done on the extract of three parts of C. odorata, namely flowers, tips (young leaves and stem), roots and combination of tips and flowers in 11 concentration levels, i.e 0 (sterile water as control), 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100%. The result showed that the extract of each part of C. odorata in all concentration levels significantly inhibit the growth of BDB. This result indicated that the extract of C. odorata can be potentially used as biopesticide for controlling BDB.

 

Key words : Chromolaena odorata, extract, blood disease bacterium, banana bacterial wilt

Cocoa-Chromolaena

POTENTIAL OF CHROMOLAENA ODORATA AS BIOFUNGICIDE OF PHYTOPHTHORA PALMIVORA, THE CAUSAL AGENT OF COCOA POD ROT 

Radix Suharjo & Titik Nur Aeny

 ABSTRACT

 The research was aimed  to investigate (1) distribution and population of Chromolaena odorata (siam weed) in different land-uses (paddy field, untreated land, houseyard, roadside and river/irigation side) in Bandar Lampung, South Lampung, Tanggamus, and East Lampung; (2) effect of C. odorata extract on in-vitro growth of Phytophthora palmivora, (3) effect of C. odorata extract on development of fruit rot symptom caused by P. palmivora on cocoa pod in the laboratory and in the field. This research was conducted from March – October 2007. Collecting of P. palmivora isolates and recording distribution and population of C. odorata were conducted in several locations known as  endemic areas of cocoa pod rot disease.  The effect of C. odorata extract on the growth of P. palmivora on agar media and cocoa pods was tested in the Laboratory of Plant Disease, Plant Protection Department, Faculty of Agriculture, University of Lampung. Field experiment was performed in a cocoa plantation in Kemiling, Bandar Lampung. The results showed that C. odorata weed can be found in all of the land-uses surveyed, but the highest population was found in the untreated land-use.  The tips (young leaves and stems) extract of C. odorata showed a greater inhibition effect on the growth of P. palmivora compared to the root extract. The tips extract showed the best inhibition in-vitro growth of P. palmivora at 40% concentration level, inhibited symptom development on cocoa pods in the laboratory at 50% concentration level, and on cocoa pods in the field at 60% concentration level.

 

Key words : cocoa pod rot, Phytophthora palmivora, Chromolaena odorata, tip  extract, root extract