A spring freeze causes
grapevine leaves and shoots to shrivel and turn brown (Below right, similar
damage from fall frost). Symptoms appear within a few hours of the episode.
Typically shoots will emerge from secondary and tertiary buds over the
next three weeks.
The long-term vine
health is rarely jeopardized. Severe injury reduces yield. Shoots from
secondary buds may produce significant crop.
 |
 |
| At
center, a fruitful secondary shoot. At right, leaf damaged by fall
frost. All photos: T. Zabadal |
|
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| Above,
a dead, shriveled primary shoot beside an emerging secondary shoot. |
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