https://jopr.mpob.gov.my Wed, 17 Nov 2021 01:48:51 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/occurrence-of-trunk-rot-in-some-oleifera-backcrosses/ Tue, 16 Nov 2021 16:29:44 +0000 https://jopr.mpob.gov.my/V2/?p=10663 Several (dura x oleifera) x dura backcrosses planted in August 1982 at Pusat Perkhidmatan Pertanian Tun Razak (PPPTR) in Pahang were found to show a high incidence of trunk rot in January 1991. This short communication is to document the occurence of trunk rot in oleifera backcrosses, a phenomenon which has not been reported before. The backcrosses originated from crossing the hybrids of Deli dura of SOCFIN origin and the Kuala Lumpur Melanococca (KLM), an oleifera palm believed to be of brazilian origin (Ooi et al., 1981), with Deli duras of Serdang and Ulu Remis origins, i.e (DxO) x D.

]]> https://jopr.mpob.gov.my/a-non-destructive-quantitative-method-for-the-assessment-of-infection-of-oil-palms-by-fusarium-oxysporum-f-sp-elaeidis/ Sun, 14 Mar 2021 11:45:18 +0000 https://jopr.mpob.gov.my/V2/?p=1297 A non-destructive technique, involving removal of cylinders from stems with an auger, is described for the quantification of disease in mature oil palms infected with Fusarium wilt. Reisolation from cores confirmed that discoloration of vascular tissue is diagnostic for Fusarium wilt.
Good agreement was obtained between disease assessment based upon leaf symptoms and this new technique. Auger sampling was the more sensitive method and in some crosses revealed 50% infection in otherwise symptomless palms. The absence of the pathogen in older ‘resistant’ palms indicated that they were truly resistant and not tolerant to the disease.
High levels of vascular occlusion occur in diseased palm trunks but not in roots, which suggests that blockage of the trunk xylem system is the critical phase in symptom development.
Auger sampling in Malaysia failed to reveal the presence of the fungus inside palm trunks.It is suggested that this technique could be useful in breeding programmes to identify resistant palms and reduce the risk of collecting seed from infected but symptomless palms. Other uses for the auger are also described.

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