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Prior to the phylloxera epidemic of the 19th century, Bonarda was speculated to have accounted for 30% of the plantings in Piedmont but today is only found in scattered plantings along the left bank of the Tanaro river near Govone.
In addition to set backs during the previous world war, the Italian diaspora and the phylloxera epidemic of the late 19th century, many of the ancient grape varieties that were brought to the main land from ancient Greek settlers and cultivated during Roman times were at risk of extinction.
The agricultural sector suffered a deep depression that affected the raising of livestock and all the major crops, especially cultivation of Vitis vinifera, a grape used for the wine industry, which was devastated by a Phylloxera epidemic.