A series of hailstorms on Friday night into Saturday morning has severely damaged some vineyards. Check your vineyard for damage. In the worst affected blocks shoots have been snapped in half and some inflorescence damage (as shown below).
There is a lack of definitive information on grapevine recovery responses to hail. It has been several years since McLaren Vale and the Adelaide Hills received damage of this level and growers experiences are limited.
However, you have to best consider how to best manage the vines to maintain yield, both in this season and next season and ensure good canopy structure. Consider the use of foliar fertilisers in your next spray round. Doses of kelp products are also considered beneficial after stress events including hail and frost.