Phylloxera was no less kind to the Armagnaçaise than to those in the rest of France and although a few growers managed to continue producing grapes, the vast majority lost everything they were growing in their vineyards. The Folle Blanche was much in favour in Gascogne, but was also one of the most vulnerable to the louse which found the weakened roots of the heavily cropped vines a wonderful source of food. Many small producers simply gave up and turned their land over to crops that provided easier and more importantly, faster and more accessible revenue. The decline in available brandies from the region also coincided with a lull in demand from British customers, who were the largest source of export trade. Levels of austerity at the end of the century and during the early First World War years had allowed the English to lose interest in the fruity brandies of the region. The Armagnaçaise also had their own problems with access to the export markets mainly as a result of their failure to further their markets in other countries. Replanting after the phylloxera was slower than other regions and only the larger growers who already had an established market were able to afford the cost of replanting.
In many ways, as is so often the case in French Viniculture, prosperity started to return to the industry with modernisation and greater demand from other countries. A new vine called the Bacco was introduced – it produced fruity wines which cropped later, providing more depth of flavour in the wines and greater flexibility in the harvest. Just at the time when sales were hitting a low, the wars came along which greatly affected sales of cognacs to the north. This enabled the fruity wines of Gascogne to be recognised for their distinctive flavours, finding favour in the bars and restaurants in Britain during the 1920’s when brandies became allied to the fashionable mid-war period.