Species from the Southwestern United States Vary in Their Susceptibility to Powdery Mildew.

The European grapevine ( L.) has been cultivated in North America for about 500 years. One of the major limitations to its culture is the powdery mildew (PM) fungus, Schw.

Genetic analysis reveals an east-west divide within North American Vitis species that mirrors their resistance to Pierce's disease.

Pierce's disease (PD) caused by the bacterium Xylella fastidiosa is a deadly disease of grapevines. This study used 20 SSR markers to genotype 326 accessions of grape species collected from the southeastern and southwestern United States, Mexico and Costa Rica. Two hundred sixty-six of these accessions, and an additional 12 PD resistant hybrid cultivars developed from southeastern US grape species, were evaluated for PD resistance.

Genetic mapping and survey of powdery mildew resistance in the wild Central Asian ancestor of cultivated grapevines in Central Asia.

Cultivated grapevines () lack resistance to powdery mildew (PM) with few exceptions. Resistance to this pathogen within has been reported in earlier studies and identified as the locus in two Central Asian table grape accessions. Other PM-resistant cultivated varieties and accessions of the wild ancestor subsp.

Identification of two novel powdery mildew resistance loci, Ren6 and Ren7, from the wild Chinese grape species Vitis piasezkii.

Background: Grapevine powdery mildew Erysiphe necator is a major fungal disease in all grape growing countries worldwide. Breeding for resistance to this disease is crucial to avoid extensive fungicide applications that are costly, labor intensive and may have detrimental effects on the environment. In the past decade, Chinese Vitis species have attracted attention from grape breeders because of their strong resistance to powdery mildew and their lack of negative fruit quality attributes that are often present in resistant North American species.

Identification of mildew resistance in wild and cultivated Central Asian grape germplasm.

Background: Cultivated grapevines, Vitis vinifera subsp. sativa, evolved from their wild relative, V. vinifera subsp.