Figure 3
From: Breakdown of resistance to grapevine downy mildew upon limited deployment of a resistant variety
Isolate SL specifically overcomes Bianca-derived resistance. P. viticola isolates SL, SC and SU were inoculated on leaf discs of the resistant species Vitis rupestris (Vrup) and the susceptible grapevine cultivar Muscat Ottonel (VvMO). Pictures in (A) and (B) were taken at 4 and 6 dpi respectively. (C) Sporulation of P. viticola SL, SC and SU isolates on leaf discs of the resistant species Vitis riparia (Vrip) and Vitis rupestris (Vrup), the resistant hybrids 0125G, 7042H and 7050H, the susceptible hybrid 7054H and the susceptible cultivar Muscat Ottonel (VvMO). Spore counting was performed at 6 dpi. Results are the average of two independent experiments with two replicates each. Bars show standard errors.