At what stage can grapes split due to powdery mildew, increasing risk for other infections?

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Multiple Choice

At what stage can grapes split due to powdery mildew, increasing risk for other infections?

Explanation:
The stage being tested is the onset of ripening, known as véraison. At this point the berries begin to swell and soften as sugars start to accumulate. Powdery mildew damages the surface of the berry, weakening the skin, and as the berry expands the damaged skin can crack or split. Those splits create entry points for other pathogens, increasing the risk of additional infections. Flowering is far earlier when there are no ripe berries to split, and ripening onset is essentially the same period described by véraison, which is the specific stage referenced here.

The stage being tested is the onset of ripening, known as véraison. At this point the berries begin to swell and soften as sugars start to accumulate. Powdery mildew damages the surface of the berry, weakening the skin, and as the berry expands the damaged skin can crack or split. Those splits create entry points for other pathogens, increasing the risk of additional infections. Flowering is far earlier when there are no ripe berries to split, and ripening onset is essentially the same period described by véraison, which is the specific stage referenced here.

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