Young Vine Decline (YVD) has been a serious problem formany new vineyard plantings in Australia over the pastdecade. Affected vines either die soon after planting orthey survive but suffer from poor vigour and low yieldsfor many years. We have consistently isolated plant pathogenic fungi Cylindrocarpon, Phaeomoniella chlamydospora,Phaeoacremonium spp. and Botryosphaeriaspp. from the roots and trunks of the declining young grapevines. It appears that we are the first to regularly isolate Botryosphaeriaceae species from the roots and lower trunk of grapevines, indicating that the fungus may not originate from pruning wound infections but possibly from the soil or inside the roots or wood when planted.Pot experiments showed that under water stress, glyphosate applied to the soil at 0.36 kg a.i. ha-1 increases the severity of the disease symptoms caused by Cylindrocarpon.Shoot growth was decreased by 89% early in the season compared with diseased vines without glyphosate. Asglyphosate is commonly used in Australian viticulture,we will need to investigate this interaction further.
|Number of pages||2|
|Publication status||Published - 2010|