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Aim:


Results:

The trial was conducted in the 2007/2008 season on two adjacent blocks of Chardonnay grape vines at the Cable Bay Vineyard, Waiheke Island. 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).

The fungicides used in the trial were the same in each block and sprayed on the same day. At verasion 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 of each block showed a clear difference in the level of powdery and downy mildew infection in the untreated block over the period from when the last fungicide had been applied and the time of the post harvest observation (Figure 1). The leaf quality also appeared to be superior in the treated block, being generally greener and more pliable.

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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) had a greater resistance to powdery and downy mildew infection. This suggests that the application Foliacin had stimulated the plants immune system. 

Previous trials conducted by AgConsult and Lincoln University showed that Foliacin increases the level of resveratrol (a plant antioxidant) in vine leaves. Plants produce resveratrol as part of thier defence mechanism (systemic acquired resistance (SAR) to control and/or prevent the spread of invading bacterial and fungal pathogens within the plant.

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Stephen Wrigley and Jerome Demmer, BioStart Limited.
Sam, Cable Bay Vinyards, Waiheke Island.