Australian grapevine yellows disease (AG Yd) is observed in many Australian grape growing regions from spring through to late summer and is associated with three phytoplasmas (simple bacteria): Candidatus Phytoplasma australiense (Australian grapevine yellows phytoplasma or CPa), Tomato Big bud phytoplasma (TBBp) and Buckland Valley grapevine yellows phytoplasma (BVGYp). The disease is named to distinguish it from grapevine yellows diseases that occur overseas and are associated with other phytoplasma species that have different biology and epidemiology to CPa, TBBp and BVGYp. A higher incidence of AG Yd occurs in the warmer inland districts of the Murray Valley in NSW and Vic, the Riverland in NSW and the Riverland in SA compared with other Australian grape growing regions.
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Factsheets & other resources
Fleck disease is named for the appearance of affected leaves on Vitis rupestris and is associated with grapevine fleck virus (GFkV). Many grapevine varieties and rootstocks infected by GFkV alone are symptomless although infection may be associated with graft incompatibilities.
Leafroll is a serious disease of grapevines that is of major importance to viticulture worldwide. It is named for the distinct leaf symptoms that can be observed on sensitive grapevine varieties from late summer and through autumn.
Rugose wood of grapevines is the name given to a group of five serious diseases: Kober stem grooving, corky bark, LN33 stem grooving, corky wood and rupestris stem pitting. These are of major importance to viticulture worldwide.