"Researchers do not make a living by selling articles to peer-reviewed scholarly journals. They write journal articles for impact. A growing number of them realize what this means in the digital age, and decide to authorize FREE online sharing of their peer-reviewed journal articles." READ, DOWNLOAD, SHARE

Aggressiveness of Ganoderma boninense and G. zonatum isolated from upper- and basal stem rot of oil palm (Elaeis guineensis) in Malaysia

http://jopr.mpob.gov.my/wp-content/uploads/2015/09/joprv27sept-rakib1.pdfBy: Rakib, M.R.M.; Bong, C.F.J.; Khairulmazmi, A. and Idris, A.S.
Journal of Oil Palm Research --- Year 2015; Volume 27; Issue 3; Page 229-240

DownloadKeywords: basal stem rot, Ganoderma boninense, Ganoderma zonatum, pathogenicity, upper stem rot

Abstract
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.