Methods and costs of providing such protection are described. Wind Winds at Carnarvon are mainly moderate to strong southerlies. This is when grapevines are growing actively and producing a crop, so it is the time of greatest concern to growers. Carnarvon also has many strong wind events and has had gale force winds and heavy rainfall associated with cyclones. Although cyclones are unlikely during the critical production period for table grapes, structures must be able to withstand these winds.
Wind can desiccate young vines, reducing their rate of growth and delaying establishment.
This is especially important in Carnarvon, because well managed, one year old bench grafted vines planted in July or August can produce a crop 16 months later and reach full production the following season. On mature vines, wind displaces foliage. This exposes bunches to the sun, resulting in sunburn. Wind generates dust that settles on to berries - grapes cannot be washed before sending to market. Dust also encourages mites that attack the foliage and can affect the berries.