Submitted to: CDFA Pierce's Disease Control Program Research Symposium
Publication Type: Proceedings
Publication Acceptance Date: November 1, 2011
Publication Date: November 21, 2011
Repository URL: http://www.cdfa.ca.gov/pdcp/Research_Symposium_Details.html
Citation: Cousins, P.S., Goolsby, J. 2011. Grape rootstock variety influence on Pierce’s Disease symptoms in chardonnay. CDFA Pierce's Disease Control Program Research Symposium. 2011: 99. Technical Abstract: Chardonnay is a Vitis vinifera scion variety that is susceptible to Pierce’s disease (PD). We are evaluating the effect of rootstock variety on PD symptom expression in Chardonnay grown in an experimental vineyard at Weslaco, Texas with high natural PD pressure and abundant vectors, including glassy-winged sharpshooter. The rootstocks under evaluation are Dog Ridge, Florilush, Tampa, Lenoir, and Freedom. Natural Xylella fastidiosa (Xf) infection is permitted to test the effect of rootstock variety on PD in the Chardonnay scions. Chardonnay vines grafted on Dog Ridge have consistently had the greatest pruning weights. Pruning weights of vines grafted on Dog Ridge always have been at least two times greater than the pruning weight of the next largest vines (by rootstock). Vines grafted on Dog Ridge are increasing in size, while vines on other rootstocks are maintaining vine size. The second largest (by pruning weight) vines are grafted on Tampa. Leaf scorch symptoms on vines grafted on Dog Ridge are less severe than on vines grafted on other rootstocks.