Viticultural Information
Diamond Muscat
Description
Species: Vitis vinifera ‘Diamond Muscat’ was released by the USDA Agricultural Research Service in 2000 as an early season white seedless with muscat flavor. It is suitable for dry on the vine (DOV) with cane cutting. ‘Diamond Muscat’ resulted from the cross A13-2 X B2-11. A13-2 =[B27-76 =(C32-155 ={P45-98 Open Pollinated} X 43-13N ={62-45 =[Maraville x Tafafihi Ahmer] x 64-18 =[Muscat of Alexandria x Sultanina]}) X Flame Seedless]. B2-11, a sibling of Summer Muscat, is a muscat flavored seedling of A4-162 X P100-111. A4-162 is a muscat flavored seedling of B37-45 ={Blackrose x P64-18 =[Muscat of Alexandria x Sultaniina]} X Flame Seedless. P100-111 is a seedling of C15-133 =[Calmeria x Blackrose] X Autumn Seedless. The clusters are medium to large and range from 0.5 to 0.75 pounds in weight. They are conical with shoulder and are well filled to slightly loose. Straggly clusters can result from reduced fruit set in years with very cool bloom-time weather. The berries are slightly larger than ‘Fiesta’, averaging 2.1 grams, and are oval in shape. The vine is vigorous and produces very high cluster numbers (average over 150 clusters per vine with 6 to 8 canes on a 6’ open gable trellis) with cane pruning. It is also fruitful on spurs, producing >75 clusters per vine on the renewal quadrilateral cordons. Thus, it has potential for wine or concentrate production with bilateral or quadrilateral cordon training and spur pruning. ‘Diamond Muscat’ ripens similarly to ‘Selma Pete’ and one week earlier than ‘Summer Muscat’ – 21 to 22 oBrix by the second week of August. The muscat flavor is pleasant and mild though it is more intense than that of ‘Summer Muscat’. It has been successfully grown as a table grape for local and farmers' markets. Raisin yields have been similar to ‘Summer Muscat’ in trials at the UC Kearney Agricultural Center, averaging 4 and 4.25 tons per acre on a 6’ open gable trellis. Raisin grades are 80 to 85% B or better with fruit at 22 oBrix. DOV raisins retain more muscat flavor than tray dried raisins. Golden raisins made from the variety have been excellent and retain the muscat flavor. Thus, they have potential to be marketed as a 'Golden Muscat' raisin.
Links
Foundation Plant Services at UC Davis is the source of Foundation grapevine material for the nursery industry, and the staff can provide information about possible sources for obtaining this stock. The National Grape Registry (NGR) contains information about varieties of wine, juice, and table grapes, raisins, and grape rootstocks available in the United States. Growers, nurseries, winemakers and researchers can find background information and source contacts for those grape varieties in this single convenient location.
Publications
Christensen, L.P. 2000. Raisin Grape Varieties (PDF). Pages 38-48 in: Raisin Production Manual. University of California, Agricultural and Natural Resources Publication 3393, Oakland, CA. Buy book
NGR Match
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