Summer has definitely arrived in the vineyards of Bordeaux with temperatures this week of over 30°C. The vines have finished flowering and the little grapes are swelling in their bunches. There has been some ‘coulure’ with some of the little berries staying small which will bring yields down – not a bad thing. The combination of the rain during flowering and the warm temperatures has meant that mildew has been an increased risk this year. In fact a spraying expert for the region a week or so ago commented that the only vines that he has seen that had no mildew at all were organic vines that have been sprayed every 6 days with Bouillie Bordelaise (copper sulphate)! The usual interval for spraying with sulphate is 14 days. The hot dry weather experienced currently has put an end to this risk for the moment anyhow. Still can see a difference of stages between bunches of the same vine which does not bode well for uniform ripeness at harvest time.
Mildew on the grapes which has an effect on the yield and quality