T.P. 1-1-12 Grape
T.P. 1-1-12 Grape
U.S. Patent No. 31,934 P2
Seedling from a 1997 cross of (Macgregor’s Riparia x St. Croix #5) x E.S. 5-4-16
Canadian Plant Breeders Rights Pending (File #20-10393)
Currently available in Canada; available in the U.S. by 2023
U.S. Patent No. 31,934 P2
Seedling from a 1997 cross of (Macgregor’s Riparia x St. Croix #5) x E.S. 5-4-16
Canadian Plant Breeders Rights Pending (File #20-10393)
Currently available in Canada; available in the U.S. by 2023
In the Vineyard
For many years, the winter hardiness of T.P. 1-1-12 vines, across several test sites, was inconsistent. Even within the same row during the same winter, individual vines would vary from having no injury to having significant injury. We now understand that the cause of this paradoxical performance is not the vine’s inherent winter hardiness, per se, but rather trunk disease. T.P. 1-1-12 appears to be susceptible to trunk diseases on older trunks and cordons. Infected vines are more susceptible to winter injury. If you keep the trunks young and healthy, then vine hardiness will be much more consistent, easily into Zone 4b. We have applied a set of training and management practices that foster trunk health and the results have been promising. The practices are described below under Training. This past winter, the vines experienced -32 F on 15 February after two weeks of double-digit below zero temperatures. Nasty late winter cold. In these T.P. 1-1-12 vines managed for better trunk health, every primary bud opened, bloomed and set 2-3 clusters. Late budbreak in spring, a few days before Petite Pearl. Secondary buds are quite fruitful. Widely adaptable to different soil types and alkalinity, from 6.0-8.0. Moderate semi-upright growth habit, some lateral growth. Requires some shoot positioning effort on a VSP system. Disease Resistance T.P.1-1-12 is quite resistant to Downy and Powdery Mildew. Some slight susceptibility to Black Rot in more humid regions like the Northeast, Mid-Atlantic and parts of the Midwest. A nominal well-timed spray program (two pre- and two post-bloom sprays), provides good Black Rot control on Verona. Also, T.P. 1-1-12 can suffer from Phomopsis under wet conditions. It is preventable with well-timed pre-bloom sprays and a spray right after fruit set. |
Training System
Our training recommendations are designed to minimize the amount of older, permanent wood on the vine. Train multiple trunks up to a VSP-style low wire. When a trunk reaches 3-4 years of age, replace it. Prune to canes instead of making cordons. Again, this reduces the amount of older permanent wood that is vulnerable to disease and winter injury. Sanitation and time of pruning is important too. Trunk diseases spread from vine to vine on pruners. Make sure that you sterilize the pruning shears after you prune a vine and before moving on to the next one. Also, prune before the warm days of spring arrive and finish by end of March. The pruning wounds are less likely to be infected by air- or water-borne sporidium when it is cold. If you prune early, the wounds will be healed over by the time the mild days of April come. We now use both of these sanitation practices on all varieties. The Fruit
In the Winery
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