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The trial was conducted in the 2007/2008 season on two adjacent blocks of Chardonnay grape vines on a Waiheke Island Vineyard. The untreated block received a standard seasonal fungicide program appropriate to the seasonal disease pressure, and the treated block received the same fungicide applications (same tank mix) to which Foliacin had been added (0.5 L/ha).  Six applications of Foliacin were made over the season.

The fungicides used in the trial were the same in each block and sprayed on the same day. At veraison the canopies of both blocks appeared to be in good condition with low disease pressure in the vines.  After veraison no further canopy fungicide applications were made to either block for the rest of the season.

Post-harvest observations showed that the vines in the Foliacin-treated block were much healthier and greener, and appeared to have less disease present (Figure 1). The leaf quality was better in the Foliacin-treated block, being greener and more pliable.


Figure 1 Effect of Foliacin Application on Disease Incidence in Chardonnay Grape Vines.

The conclusion drawn from this grower trial is that the vines sprayed with Foliacin (0.5L/ha; 3 L applied over the season) had better canopy health late season. This should lead to improved photosynthesis and laying down of carbohydrate reserves in the roots to start of next seasons growth.