Journal of Oil Palm Research Vol. 27  September 2015 p.  229-240
DOI:

AGGRESSIVENESS OF Ganoderma boninense AND G. zonatum ISOLATED FROM UPPER– AND BASAL STEM ROT OF OIL PALM (Elaeis guineensis) IN MALAYSIA

Author(s): RAKIB, M R M*; BONG, C F J*; KHAIRULMAZMI, A** and IDRIS, A S#

Cur­rently, the most known dev­as­tat­ing oil palm dis­ease through­out South-east Asia is basal stem rot (BSR) caused by Gan­o­derma boni­nense. How­ever, there is insuf­fi­cient infor­ma­tion on G. zona­tum which also has been asso­ci­ated with the BSR, and upper stem rot (USR). Thus, this study reports patho­log­i­cal symp­toms and degree of aggres­sive­ness amongst G. zona­tum and G. boni­nense of USR and BSR on oil palm seedlings. All the Gan­o­derma iso­lates tested showed pos­i­tive signs of infec­tion on the seedlings at 12 and up to 24 weeks after inoc­u­la­tion. How­ever, the symp­toms of infec­tion on the seedlings were indis­tin­guish­able amongst the Gan­o­derma species tested. In fact, they showed sig­nif­i­cantly dif­fer­ent degree of aggres­sive­ness in terms of area under dis­ease progress curve (AUDPC), epi­demic rate, sever­ity of foliar symp­toms (SFS), dis­ease sever­ity index (DSI), stem bole necro­sis and pri­mary roots necro­sis. The present find­ings sug­gested that G. zona­tum of USR was the most aggres­sive, fol­lowed by G. zona­tum and G. boni­nense of BSR, and G. boni­nense of USR was the least aggres­sive. Hence, a new mech­a­nism of con­trol strate­gies is urgently required to con­tain the dis­ease from spread­ing espe­cially for USR and also for G. zona­tum in Malaysia.

Keywords: , , , ,

Author Information
* Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Campus, Nyabau Road, 97000 Bintulu, Sarawak, Malaysia. E-mail: josephbcf@upm.edu.my

** Department of Plant Protection, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.

# Malaysian Palm Oil Board, 6 Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia.


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