Location: Crop Diseases, Pests and Genetics
2013 Annual Report
In 2012, over 550 seedlings and advanced table grape selections were fully evaluated for fruit and crop quality in the field. However, no new grape selections were determined to be sufficiently promising to warrant addition to 27-vine evaluation plots. Over 80 specific cultural treatments were administered to the 16 advanced selections and 10 cultivars in the experimental evaluation field plot. Selections H20, K2 and K15 show commercial potential.
Numerous hybridizations were performed during the 2012 bloom. Fourteen specific crosses (36,000 emasculations) involved high fruit quality seedless parents. Another 28 crosses were performed (48,000 emasculations) among PM resistant parents. Seedlings arising from PM resistant parent(s) were challenged with PM in the greenhouse to identify susceptible seedlings. Only PM resistant seedlings were transplanted to the field.
All previously planted PM resistant table grape selections were re-evaluated in the field for resistance. One particular selection, with Vitis romanetii-based PM resistance, warranted propagation into a 27-vine production trial. This red-skinned selection has high fruit production of average-sized conical clusters of 10/16” berries. Advanced selection O8, the first PM resistant selection to fruit in 27-vine production plots, did not perform well in post-harvest storage tests.