Systemic iron implants alleviate symptoms of Mundulla Yellows in roadside eucalypts in south east South Australia

Evidence for infection ofEucalyptus camaldulensiswith aLeifsoniabacterium in Australia and Syria using high throughput sequencing

“…We used a dot-blot hybridisation assay with oligonucleotide probes representing each polarity of each of ten candidate contigs and found one set which differentiated some symptomatic trees from axenically grown disease-free E. camaldulensis. This set of probes represented a contig of 766nts which had 95% sequence similarity to genomic DNA of Leifsonia bacteria (Wang et al, 2016). The sequence was identified in samples from both Australian and Syrian trees.…”

“…No specific pathogen has been shown to cause MY, although associations of the nematode Merlinius spp, virus-like particles, and an 84kDa and 116kDa protein with the disease (Hanold et al, 2006;Luck et al, 2006;Randles et al, 2010) support the view that one or more infectious agents may contribute to disease expression. Abiotic nutritional and soil factors such as those inducing lime chlorosis (Luck et al, 2006;Czerniakowski et al, 2006) have been implicated in symptom development by the alleviation of foliar and crown symptoms with iron and manganese implants (Schultz and Good, 2018), but longterm recovery from the full disease syndrome indicating a single abiotic cause has not been reported. It is important to determine whether there is a consistent association between a principal biotic or abiotic factor so that management strategies can be developed as for other diseases of eucalypts (Keane et al, 2000).…”