Status

Update: 03 Mar 2020
Published: since 1 Mar 2008

Online Users: 5

 

Copyright © 2011
SEAMEO BIOTROP
All Rights Reserved.

BIOTROP on FacebookFollow us on Facebook

us on Twitter

ISO 9001:2008 Certified

ISO 17025:2005 Certified

KNAPPP Certified
Diseases of Jatropha curcas L. and their Intensity in Lampung Province
Researcher : C. Ginting, T. Maryono
Published : 2007
Group :Biodiversity
Full Report : Special request
Abstract :
The objectives of this research were to diagnose diseases occurring on J. curcas in Lampung Province and to determine the intensity of the diseases in the field. The process of disease diagnosis started from field observation of J. curcas diseases conducted in Lampung Selatan, Tanggamus, Bandarlampung, and Tulang Bawang districts. Observation was focused on symptoms of diseases as they occur in the field and factors that might affect the diseases. To determine the intensity of diseases, plant samples were selected by making diagonal lines across the field and five observation spots were made. Specimens were collected and placed individually in plastic bags. In the laboratory, each of the specimen was observed soon upon the arrival or the next day and some were used to isolate infecting fungi by using potato dextrose agar (PDA) supplemented with lactic acid 1.4 ml per liter media. For symptoms suspected to be caused by virus, diagnosis was based on the symptoms. When the symptom was suspected to be caused by pathogenic bacteria, diagnosis was based on internal and external symptoms and bacterial ooze. The results showed that the diseases found on J. curcas in Lampung Province were cercospora leaf spot, alternaria leaf spot, fusarium wilt, and bacteial wilt. In addition, malformed leaves first thought to be caused by a plant virus were commonly found in many locations. Mechanic transmission failed to produce similar symptom on tested plants and more mites were found on malformed leaves compared to that in normal leaves. Based on the distribution and intensity of the diseases, bacterial wilt has the potential to cause losses to J. curcas cultivation. In addition, Fusariam wilt was only found in one subdistrict (Tulang Bawang) with low incidence.