Ceratocystis wilt on Eucalyptus: first record from South Africa
J Roux , MJ Wingfield, A Fourie, K Noeth & I Barnes
Wilt and death of an E. grandis × E. urophylla variety
was recently observed in the Zululand region of KwaZulu-Natal, South
Africa. Symptoms on the dying trees included a streaking pattern of
discolouration in the sapwood and cambium of stems and roots. A fungus
resembling a Ceratocystis sp. was consistently found sporulating
on diseased material and isolated from the symptomatic root and stem
tissue. DNA sequence analyses of the Ceratocystis isolates, including multiple gene regions, identified the isolates as C. eucalypticola. Multiple ITS types were identified among the isolates sequenced, similar to those found in other, closely related, Ceratocystis species.
Artificial inoculations under field conditions confirmed the
pathogenicity of the isolates. This is the first report of a Ceratocystis sp. causing a wilt disease of Eucalyptus in South Africa.
Read the full article here: https://www.tandfonline.com/doi/abs/10.2989/20702620.2019.1686687