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Rootstocks and Vine Performance A summary of what's new in winegrape root system research By Andrew G. Reynolds T his first installment of a two-part report includes some abstracts of recent articles that deal with the part of the grapevine we don't see—the rootsystem and its immediate environment. This installment includes articles related primarily to rootstock's effects on vine performance: yield, berry composition, scion physiology, etc. The second group of abstracts deals with pest problems that may be reduced by rootstock choice such as viruses and nematodes. (Editor's note: Important research in Washington state on root- stock use versus own-rooted vines did not fit into this report but will be covered separately in a coming issue of Wines & Vines.) Rootstock and Shiraz Shiraz grapevines either own-rooted or grafted to three different rootstocks [ramsey (Vitis champinii), Schwarzmann (V. riparia x V. rupestris) and 115 140 ruggeri (V. berlandieri x V. rupes- tris)] at two sites in australia (adelaide and nuriootpa) were used to evaluate the effect of rootstock on primary bud necrosis (pBn), fruitfulness and carbohydrate storage. Buds were dis- GreenHoe_NewAd_1/4_9/22.qxp 9/28/09 9:30 AM Page 1 sected during winter dormancy and assessed for the number of inflorescence primordia (Ip) and incidence of pBn. Trunks, canes and roots were sampled at dormancy for carbohydrate concentration. a water-deficit treatment was also applied at one of the two locations. fruitfulness and yield were affected by water deficit. rootstock type influenced the incidence of GREEN GRAPE HOE Specialized Tools For Vineyards Weed Control and In-Row cultivation Basic Hoe comes with a Hillup and a Takeaway Blade. Additional attach- ments include .3 Tooth Cultivator, Undercutter Blade, CORK SUPPLIER? All Natural Cork Closures NEED A BETTER Fresh Corks Directly From Portugal 4th Generation Family Cork Producer FREE BRANDING FREE SHIPPING FREE IS BETTER Ask about our Progressive Discounts CALL TODAY Phone (203) 681-7743 Cell (860) 335-0667 Green Hoe with Rotary Head Attachment Rotary head, "NEW" Rolling Cultivator and "New" Brush Rake for removing trimmings out from under the trellis. 6645 West Main Road Portland, NY 14769 PHONE (716) 792-9433 FAX (716) 792-9434 WWW.GREENHOECOMPANY.COM Wines & Vines JULY 2012 63 email: reliablecork@gmail.com www.reliablecorksolutions.com Wine East HIGHLIGHTS: • • • The part of the grapevine we don't see has a lot to do with vine performance including yield, berry composition and vine physiology. Three recent research articles on the subject are sum- marized here. The studies referenced evaluate the effect of rootstock on drought tolerance, shiraz and Cabernet sauvignon. WineEast