What negative effect can occur due to intensely sunny conditions for grapes?

Intensely sunny conditions can lead to sunburn on grapes, which is a significant concern for grape quality. When grapes are exposed to excessive sunlight, the skins can become damaged due to overheating. This sunburn not only affects the color and overall appearance of the grapes but can also lead to the development of bitter flavors in the grape skins. These bitter flavors can negatively impact the taste of the wine produced from those grapes, resulting in a lower-quality product. Proper canopy management is essential in vineyards to ensure that grape clusters are adequately shaded, thereby minimizing the risk of sunburn and preserving the desirable flavors in the fruit.