Ganoderma steyaertanum as a root‐rot pathogen of forest trees

Abstract

Two Acacia seed orchards, one each of A. mangium and A. auriculiformis, in Central Java have suffered high losses from root rot associated with a species of Ganoderma that is distinct from G. philippii, which causes extensive losses in A. mangium plantations in Sumatra and Kalimantan. Ganoderma steyaertanum was consistently isolated from roots of affected trees in the Javanese orchards and pathogenicity was confirmed by satisfying Koch's postulates. The mode of spread of the pathogen was examined by analysing the distribution of tree deaths in the A. mangium seed orchard and conducting somatic incompatibility tests among G. steyaertanum isolates from diseased trees. Spatial analyses indicate that, after an initially random disease distribution, the pattern of tree deaths was clustered. This is consistent with spore colonisation of thinned stumps followed by vegetative spread through root-to-root contact, as has been observed for other root pathogens such as Heterobasidion annosum. Somatic incompatibility tests demonstrated high genetic variability of the pathogen with root-to-root spread also confirmed.

Structural host responses of Acacia mangium and Eucalyptus pellita to artificial infection with the root rot pathogen, Ganoderma philippii

“…The outer surface of infected woody roots of both A. mangium and E. pellita roots exhibited the characteristic reddish‐brown mycelial sheath (Figs and ), as previously described for red root disease (Agustini, Francis, Glen, Indrayadi, & Mohammed, ; Eyles et al., ; Hidayati, Glen, Nurrohmah, Rimbawanto, & Mohammed, ). The red mycelial sheath of E. pellita was generally less obvious than in A. mangium , both because it was often thinner and the bark colour of healthy root are somewhat reddish/brownish (Fig.…”

“…The outer surface of infected woody roots of both A. mangium and E. pellita roots exhibited the characteristic reddish-brown mycelial sheath (Figs 1 and 2), as previously described for red root disease (Agustini, Francis, Glen, Indrayadi, & Mohammed, 2014;Eyles et al, 2008;Hidayati, Glen, Nurrohmah, Rimbawanto, & Mohammed, 2014).…”

Signs and identification of fungal root‐rot pathogens in tropical Eucalyptus pellita plantations

“…In addition, the number of pores mm À1 was much smaller than that stated in Glen et al (2009). also causes a red root-rot in A. mangium, similar to that caused by G. philippii; this has been confirmed by inoculation tests (Hidayati et al 2014). The value of rDNA ITS sequences in resolving species boundaries in the Ganodermataceae has been noted previously (Smith and Sivasithamparam 2000;Moncalvo and Buchanan 2008;Glen et al 2009).…”

“…Smith and Sivasith. also causes a red root-rot in A. mangium, similar to that caused by G. philippii; this has been confirmed by inoculation tests (Hidayati et al 2014). In the absence of inoculation tests with G. mastoporum, it is unclear whether this species produces the red mycelial sheath or merely colonises roots that have previously been rotted by G. philippii.…”

INVENTARISASI DAN IDENTIFIKASI PENYEBAB PENYAKIT PADA Acacia auriculiformis DI YOGYAKARTA

“…Permukaan atas Ganoderma ini berwarna coklat dan bagian bawahnya berwarna putih. Berdasarkan ciri-ciri morfologisnya, ganoderma yang ditemukan ini merupakan jamur Ganoderma steyaertanum (Hidayati, Glen, Nurrohmah, Rimbawanto, & Mohammed, 2014). Tubuh buah jamur Ganoderma yang ditemukan ini berada pada kondisi tingkat lanjut.…”