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.
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Factsheets & other resources
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.
In most parts of south-eastern Australia, season 2010–11 was the wettest since 1973–74 and 1974–75, surpassing the difficult seasons of 1992–93 and 1983–84.
The wet conditions brought three waves of assault on vineyards by diseases: first downy mildew, then powdery and finally the bunch rots. Let’s look at these three, ask what, if anything, can be done about them now and briefly look forward in readiness for the best controls in 2011–12.
Power point presentation.
Botrytis rot, caused by Botrytis cinerea, is one of a number of different fungi that can cause bunch rots on grapevines. The following information only relates to ‘in season’ management and does not cover other factors that affect botrytis risk such as site selection, variety and rootstock selection, row orientation, spacing and trellis type.
Powdery mildew produces irregular yellow blotches that are best seen on the upper surfaces of leaves and, on varieties like Chardonnay, it produces browning of the smallest (tertiary) veinlets on the undersides of leaves.
Downy mildew produces golden-yellow, oily spots on leaves, which are best seen on the top side of the leaves. This factsheet discusses some common questions regarding this disease.
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 of grapevines – ‘train the trainer’ notes