| Sun scald causes
grape berry surfaces to become brown and possibly shriveled. These
symptoms appear on the portions of the cluster exposed to direct
sunlight. This injury often occurs when fruit that has developed
in shade is exposed to direct sunlight, such as when leaf removal,
summer pruning, shoot positioning or other canopy management practices
occur in mid-to late season. Fruit exposed to sunlight for the entire
growing season may also develop sun scald when drought conditions
develop. Fruit damaged by sun scald may develop various fruit rots
and deteriorate further. |
 |
| White
Riesling grapes near harvest injured by sun scald and subsequently
infected with fruit rot. Photo: T. Zabadal |
|
