A new and distinct variety of grapevine named ‘SAUVIGNON KRETOS’, primarily adapted to the growing conditions of the temperate regions, and characterized by its strong vigor; erect growth habit; wedge-shaped leaves with medium texture; medium weight and conical shaped berry clusters; early maturing, firm berry flesh with no coloration and neutral taste primarily for winemaking; early harvesting time; and resistance to winter temperatures (to −22° C.), resistance to downy mildew and tolerance to powdery mildew.

Latin name of the genus and species of the plant claimed:Vitis×vinifera(hybrid).

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct summer/fall bearing grapevine variety, botanically known asVitis vinifera, and hereinafter referred to by the name ‘SAUVIGNON KRETOS’.

The new grapevine ‘SAUVIGNON KRETOS’ is a product of a controlled breeding program conducted by the inventors in Udine, Italy. The objective of the breeding program was to develop a new grapevine variety particularly characterized by resistance to cold (<−20° C.), resistance to downy mildew (Plasmopara viticola), and tolerance to powdery mildew (Uncinula necator).

The new grapevine ‘SAUVIGNON KRETOS’ originated from a cross made by the inventors in 2002 in Udine, Italy. The female or seed parent is the grapevine varietyVitis vinifera‘Sauvignon’ (unpatented), and the male or pollen parent is the grapevine varietyVitis ‘20/3’ (Bianca×SK77-4/5) (unpatented).

The new grapevine ‘SAUVIGNON KRETOS’ was discovered and selected by the inventors as a single flowering plant within the progeny of the stated cross in a controlled environment in 2002 in Udine, Italy. Asexual reproduction of the new grapevine variety by grafting was first performed in February 2004 in Rauscedo, Friuli Venezia Giulia region, Italy, and has demonstrated that the combination of characteristics as herein disclosed for the new cultivar are firmly fixed and retained through successive generations of asexual reproduction. The new cultivar reproduces true to type.

SUMMARY OF THE INVENTION

‘SAUVIGNON KRETOS’ is primarily adapted to the climate and growing conditions of the temperate regions with average yearly temperature about 13° C., minimum winter temperature about −20° C., annual rainfall around 700-1500 mm of rain (e.g. North-Eastern Italy, Friuli). This region provides the necessary year-round temperatures required for it to produce and maintain a strong vigorous plant with consistent fruit production from April through November on primocanes and in the ensuing year from April through November on the floricanes.

The following traits have been repeatedly observed and are determined to be unique characteristics of ‘SAUVIGNON KRETOS’, which in combination distinguish this grapevine plant as a new and distinct variety.1. Strong vigor;2. Erect growth habit;3. Wedge-shaped leaves with a medium green upper surface and light green lower surface and a medium texture;4. Fruit clusters with medium weight, conical shape, firm berry flesh with neutral taste, and no flesh coloration, early maturity (end of August in Middle Friuli, North-Eastern Italy); and primarily used for wine.5. Primocanes and floricanes with an elliptic cross section, brownish color, no lenticels, and small internodes of 8 mm diameter;6. Early harvesting time, at end of August in Middle Friuli, North-Eastern Italy; and7. Resistance to winter temperature (−22° C.), resistance to downy mildew, and tolerant to powdery mildew, if overripening is allowed it is susceptible to cluster rots.

Plants of the new grapevine ‘SAUVIGNON KRETOS’ differ from plants of the parents,Vitis vinifera‘Sauvignon’ (unpatented) andVitis ‘20/3’ (unpatented), in the following characteristics described in Table 1.

Of the many commercial cultivars known to the present inventor, the most similar to the new grapevine ‘SAUVIGNON KRETOS’ is the female parent ‘Sauvignon’, to which a comparison has been provided above.

DETAILED BOTANICAL DESCRIPTION

The following description of ‘SAUVIGNON KRETOS’ unless otherwise noted, is based on observations taken during the 2011, 2012, and 2013 growing seasons in Udine, Italy and Fossalon di Grado (GO), Italy, from plants dug from a nursery located in Vivai Cooperativi Rauscedo, Rauscedo (PN), Italy during the beginning of December 2007 and planted approximately 16 to 20 weeks later in Udine, Italy and Fossalon di Grado (GO), Italy. The phenotypical descriptions and color designations stated for the new variety may vary, depending upon variations in environmental factors, including weather (temperature, humidity and light intensity), day length, soil type, location and cultural conditions. ‘SAUVIGNON KRETOS’ has not been observed under all possible environmental conditions.

Color references are made to The Royal Horticultural Society Colour Chart (R.H.S.), (Edition V, 2007), except where general colors of ordinary significance are used.