Matthew Wilson reports from the Adelaide Hills - Cooler weather this week has allowed the continued spread of Powdery Mildew (above). Some blocks throughout the district are now presenting very high levels of bunch powdery. Heavy canopies have provided ample protection and cover for powdery to flourish. Most leaf infections have been controlled, but in many cases, bunches deep within the canopies are still showing devastating levels of active powdery mildew (below).
Buttshoot removal and leaf plucking are being employed in some chardonnay blocks. This helps increase fruit exposure and airflow which can naturally help control powdery. Low levels of bunch powdery is now being detected on bunches in Sauvignon Blanc blocks. There is still time to control this effectively, before withholding periods limit control strategies.