Eutypa dieback, caused by the fungus Eutypa lata, is a major trunk disease of grapevines. The productivity of infected grapevines gradually declines and vines eventually die.
Eutypa dieback occurs worldwide in cool climate wine regions with annual rainfall exceeding 350 mm. It is widespread in premium winegrowing regions of south eastern states of Australia and New Zealand.
Vines become infected through fresh wounds such as those made during pruning or reworking. The fungus grows slowly through the cordon and trunk eventually discolouring and killing wood. Toxins produced by the fungus cause stunted shoots.
Video Guide (very good guide)
Overview of Eutypa dieback and control – Vitinotes
Trunk Diseases – Vinehealth Australia
Eutypa – fact sheet
Wine Australia – work on trunk diseases
Grapevine trunk diseases, with pictures
Detailed descriptor of Eutypa, further references
Survey of Eutypa in the Limestone Coast