Subscribe Now Subscribe Today
Science Alert
 
Blue
   
Curve Top
Journal of Biological Sciences
  Year: 2012 | Volume: 12 | Issue: 4 | Page No.: 232-238
DOI: 10.3923/jbs.2012.232.238
 
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Spatial Variability of Orange Spotting Disease in Oil Palm

S. Selvaraja, S.K. Balasundram, G. Vadamalai and M.H.A. Husni

Abstract:
Orange Spotting (OS) disease which is caused by Cadang-Cadang Coconut Viroid (CCCVd) is an emerging problem in oil palm. This study was aimed at quantifying the spatial variability of OS disease severity as an effort to augment the effectiveness of OS phytopathometry appraisal. A 4.2 ha study plot was established in a commercial oil palm plantation at Sungai Buloh, Selangor. A total of 587 geo-referenced trees were visually observed for OS disease symptoms. OS disease severity data were first subjected to exploratory analysis and followed by variography and interpolation analyses to assess spatial variability. The incidence OS disease in the study area was 74.3%. Measured OS disease severity ranged from 0-92.3%. The spatial structure of OS disease severity was described by an exponential model with an effective range of 29.1 m. OS disease severity exhibited a strong spatial dependence with a nugget to sill ratio of 0.15. The spatial variability map of OS disease severity revealed spatial clustering of kriged values, where 73% of the study area showed low severity (1-30%), 25% showed moderate severity (30-60%) and approximately 2% showed high severity (> 60%). This study demonstrates the utility of geo-spatial information in understanding the OS disease severity scale which could assist in site-specific disease monitoring and intervention.
PDF Fulltext XML References Citation Report Citation
 RELATED ARTICLES:
  •    Accounting for Spatial Variability in a Short-Term Fertilizer Trial for Oil Palm
  •    Application of Geostatistical Tools to Quantify Spatial Variability of Selected Soil Chemical Properties from a Cultivated Tropical Peat
How to cite this article:

S. Selvaraja, S.K. Balasundram, G. Vadamalai and M.H.A. Husni, 2012. Spatial Variability of Orange Spotting Disease in Oil Palm. Journal of Biological Sciences, 12: 232-238.

DOI: 10.3923/jbs.2012.232.238

URL: https://scialert.net/abstract/?doi=jbs.2012.232.238

COMMENT ON THIS PAPER
 
 
 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 

Curve Bottom