Abstract
An emerging challenge for the productivity of the Australian walnut industry is yield losses
caused by dieback of branches and fruiting spurs. Species of Botryosphaeriaceae that have
been implicated in dieback in many horticultural crops worldwide have been reported in
walnut orchards in Australia, yet systematic studies on the species present and control
strategies are incipient. This is the first systematic study to investigate the epidemiology and
management of Botryosphaeria dieback in walnuts in Australia. DNA sequencing of fungi
isolated from walnut tissues collected from major walnut growing regions of Australia
confirmed the presence of five Botryosphaeriaceae species, namely Diplodia seriata,
Dothiorella omnivora, Neofusicoccum parvum, N. macroclavatum and Spencermartinsia
viticola. Of these, D. seriata and N. parvum were the most prevalent species. Pathogenicity
studies using detached stems and potted plants in the glasshouse indicated that N. parvum
was the most virulent, causing lesions that were three times greater than D. seriata. Pruning
wounds were susceptible to N. parvum and D. seriata for up to four months and two months
respectively, with the highest disease incidence occurring in the first week following pruning.
The green shoots and younger tissues were more susceptible than the older stems to the
isolates selected for pathogenicity studies. Further glasshouse experiments on disease
progression and field trials on control strategies are in progress.
caused by dieback of branches and fruiting spurs. Species of Botryosphaeriaceae that have
been implicated in dieback in many horticultural crops worldwide have been reported in
walnut orchards in Australia, yet systematic studies on the species present and control
strategies are incipient. This is the first systematic study to investigate the epidemiology and
management of Botryosphaeria dieback in walnuts in Australia. DNA sequencing of fungi
isolated from walnut tissues collected from major walnut growing regions of Australia
confirmed the presence of five Botryosphaeriaceae species, namely Diplodia seriata,
Dothiorella omnivora, Neofusicoccum parvum, N. macroclavatum and Spencermartinsia
viticola. Of these, D. seriata and N. parvum were the most prevalent species. Pathogenicity
studies using detached stems and potted plants in the glasshouse indicated that N. parvum
was the most virulent, causing lesions that were three times greater than D. seriata. Pruning
wounds were susceptible to N. parvum and D. seriata for up to four months and two months
respectively, with the highest disease incidence occurring in the first week following pruning.
The green shoots and younger tissues were more susceptible than the older stems to the
isolates selected for pathogenicity studies. Further glasshouse experiments on disease
progression and field trials on control strategies are in progress.
| Original language | English |
|---|---|
| Pages | 163 |
| Number of pages | 1 |
| Publication status | Published - Aug 2023 |
| Event | 12th International Congress of Plant Pathology 2023 - Lyon Convention Centre, Lyon, France Duration: 20 Aug 2023 → 25 Aug 2023 https://www.icpp2023.org/ https://www.icpp2023.org/sites/default/files/2023-08/ICPP2023-programme-VF_030823.pdf (Program) https://www.icpp2023.org/programme/abstracts-book (Abstract book) |
Conference
| Conference | 12th International Congress of Plant Pathology 2023 |
|---|---|
| Country/Territory | France |
| City | Lyon |
| Period | 20/08/23 → 25/08/23 |
| Other | On behalf of the International Society for Plant Pathology, I am pleased to invite you to participate in the International Congress of Plant Pathology in Lyon, France from August 20-25, 2023! Plant pathologists and plant health researchers from around the world will meet to discuss their latest research as well as current and future issues facing plant health experts. Our host, the French Phytopathological Society, has set an exciting and challenging theme for the congress, “One Health for all plants, crops and trees”. This topic promises to provide a broad platform for talks, posters, and discussions that consider the integral nature of plant health with human, animal and environmental health. We look forward to welcoming you in person to this exciting event. In addition to an excellent program of keynote talks, concurrent sessions, poster presentations, and networking opportunities, there will be a number of satellite events before the meeting dates to provide opportunities for deeper discussions into a number of topics. Rejoignez-nous! We promise an educational, thought-provoking week! |
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