Creating Xylella Resistant Grapevines by Conventional Breeding Andy Walker, Alan Tenscher, Summaira Riaz & David Ramming

3. PD Resistance of Olmo’s Mexico Collections 9R 7I 8S 4R,2I,1S 8R,0S 5R 4I 1S 1R,0S

9. 8909-19 S 8909-08 R

14. Progress at 93.75% V. vinifera ( mBC3) F8909-08 = V. rupestris x V. arizonica b43-17 504-49 = B90-116 x 8909-08 ( PdR1b ) A81-17 = A38-17 x 504-49 0502-48 = A81-138 x Chardonnay 0505-01 = A81-138 x Cabernet Sauvignon

15. 2008 crosses to produce (A) = 93.75% vinifera PdR1b (F8909-08) and (B) = 87.5% vinifera PdR1a resistance (F8909-17).

16. 2008 crosses to produce: A) = 90.6% vinifera PdR1b (F8909-08) with Run1 powdery mildew resistance; and B) = 87.5% vinifera PdR1b resistance (F8909-08) with vinifera PM resistance.

17. 2008 rootstock crosses to combine PD and nematode resistance.

18. 2008 Crosses: 87.5% vinifera progeny (A) PdR1a (F8909-17); (B) arizonica b40-14 (06339); (C) shuttleworthii (0098-03 – 75% vinifera and 04394 – 50% vinifera ); and (D) arizonica/girdiana b42-26 (50% vinifera progeny).

19. 87.5% V. vinifera / 50% Chardonnay

20. 2008 Winegrape Evaluations Reference cultivars and select 87.5% vinifera progeny with PdR1 .

21. 2008 Winegrape Evaluations Juice and wine analysis courtesy of ETS Laboratories, St. Helena, CA.

22. 2008 Wine Evaluations 87.5% vinifera Tasting results of 2007 wines (1= poor to 5 = very good). There were 10 faculty and staff tasters. Cabernet Sauv., Midsouth and U0502-07 and -01 not fermented in 2008

23. Thanks!