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17/11/2014

Emblem now registered to control Eutypa dieback in grapevines

Registration of the trusted vineyard fungicide Emblem has been extended to cover Eutypa dieback in Australian grapevines, just ahead of a major international conference on grapevine trunk diseases in Adelaide this month.
Dr Mark Sosnowski, convenor of the 9th International Workshop on Grapevine Trunk Diseases, said having a registered Eutypa fungicide that can be applied post-pruning with a vineyard sprayer was a significant step forward in the bid to save Australia’s premium quality vines from devastation by trunk disease.
“Trunk disease threatens the long-term sustainability of the Australian wine industry, and the incidence is steadily increasing. We are yet to find a wine region in Australia not affected by eutypa and/or botryosphaeria dieback – the two most important trunk diseases in Australia and in most other grape-growing countries.”
“The most cost-effective method of Eutypa control is to prevent disease entry into the vine by protecting pruning wounds.”
As South Australian Research and Development Institute (SARDI) science leader, Dr Sosnowski has been heavily involved in industry research to find alternatives for managing Eutypa – which identified Emblem (fluazinam) as an effective control when applied to pruning wounds with standard vineyard spray equipment.
He said the fungus Eutypa lata infects vines through pruning wounds, colonising wood tissue and causing dieback of cordons, stunting of green shoots, leaf distortion, poor fruit set, uneven berry ripening and eventual death of vines if not controlled.
An Australian Grape and Wine Authority (AGWA)-funded study ranked trunk disease as the fourth-most economically-important grapevine disease – behind powdery mildew, downy mildew and botryitis.
“While there are many effective registered treatments for the first three diseases, there has been very little registered for trunk disease, and before this Emblem registration there was nothing that could be applied with a commercial sprayer.
“To sustain our premium vineyards across Australia, post-pruning sprays will need to become common place. This can now be achieved, with an effective fungicide registered for this purpose.”
Dr Sosnowski said Australia’s first-time hosting of an International Workshop on Grapevine Trunk Diseases provided the chance to showcase the Australian wine industry and our pro-active efforts and research to manage trunk disease.
“Three years’ research into managing Eutypa dieback – by SARDI, University of Adelaide, and the AGWA – identified Emblem as an effective pruning-wound treatment. High-volume recycle sprayers and a home-engineered cordon sprayer provided maximum spray coverage of Emblem on the wounds, and provided control equivalent to treatments applied by paintbrush.”
Crop Care researcher Doug Wilson said the addition of Eutypa to the Emblem label – allowing application to pruning wounds with a vineyard sprayer – offered an economic alternative to hand application of wound-protectants.
“It provides a new solution for controlling Eutypa – a significant problem in most of Australia’s cool-climate growing regions, threatening the long-term sustainability of many vineyards and premium grapevines.
“Emblem is already registered for the control of phomopsis in grapevines. The product has good residual and rainfast properties and is a multi-site fungicide considered to be at low risk of developing disease resistance.”
He said Emblem’s re-entry period allowed workers to return to the vineyard for pruning, training vines and disease scouting as soon as the spray has dried.
The label advises application within 24 hours of pruning, as a directed spray, in a water volume that ensures thorough coverage of all pruning cuts.


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