Damage from low winter temperatures is arguably the greatest risk to sustainable profitable winegrape production in the eastern US. The majority of Maryland vineyards have not experienced a significant amount of low temperature damage over the past decade or so, however some vineyards have experienced damage this winter (2013/2014). The following “Timely Vit” will give an overview of how to assess the damage and how to modify your pruning based on the assessment. Please see the previous “Timely Vit” in the series on “Understanding Grapevine Bud Damage” for an overview of how vines attempt to prevent damage, the conditions which influence the level of damage, and types of damage.
When temperatures below 0 ˚F take place, it is prudent for growers to collect canes and assess bud damage prior to pruning. Here are some guidelines for bud damage assessment and pruning adjustment.
FLGP Bud Injury Testing Part 1.
FLGP Bud Injury Testing Part 2.
If there is damage to buds you can modify your normal pruning practices and leave proportionately more buds to try to compensate for the damage and get back to a “normal” or desired crop level.
“Anatomy of Grapevine Winter Injury and Recovery”
“Assessing Winter Cold Injury to Grape Buds”
“Assessing Winter Cold Injury of Grape Canes and Trunks”
“How Grapevine Buds Gain and Lose Cold-Hardiness”
“Winter injury to Grapevines and Methods of Protection.” Zabadal, T., et.al. 2007
MSUE Bull. # E 2930; 105 pp List Price: $15.00.
To access a printable version, click on the pdf document below
Timely Viticulture is designed to give those in the Maryland grape industry a timely reminder on procedures or topics they should be considering in the vineyard. To view other topics you can go to the Timely Viticulture page that is located on the Grapes and Fruit website.