INTRODUCTION
From the mid XVIII century onwards, the production of Madeira wine kept increasing until the 1820’s.
The vineyards on the island were able to evolve to meet market demand, and the British influence in Madeira helped secure a privileged destiny for Madeira.
In fact, the overwhelming popularity of Madeira wine was largely due to the nature of European and colonial political and economic reality. During periods of conflict, the colonies were closed off from Europe, and this opened up a ready market for the island’s wines. The colonial market weighed so heavily on the island’s capacity to supply wine, that there were times when demand exceeded supply. In the face of unbridled demand, and given the low volume of quality wine available, the shippers resorted to exporting inferior wines, previously destined for internal consumption, or for distillation to produce brandy.
In order to meet demand, attention turned to increasing the volume of grapes grown on the island, and less care was taken in the production and aging of wines. When market demand from Europe normalised, the Madeiran economy slid into recession.
Madeira wine began to fall in popularity, due not to the competition from other wines, such as Port and Sherry, but also because of the poor reputation the wine had in its traditional markets. This was as a result of the low quality of exported wine, and also because of a number of cases of fraud. All this meant that the price paid for Madeiran wine fell considerably.
The impending crisis in Madeira’s viniculture was anticipated by the arrival of oidium (
Oidium tuckerii or “powdery mildew”) on the island in the mid nineteenth century. Oidium was more commonly known to the Madeiran’s as "
mangra". Some years later, the appearance of phylloxera provoked further change in the island’s viticulture.
Despite natural disasters and the oidium and phylloxera plagues, Madeira wine survived, and is today one of the mainstays of the island’s economy, together with tourism and the banana crop.
THE SPREAD OF OIDIUM
Oidium came from the United States and was first detected in Europe in 1847 when it was found in France. It is alleged that it reached Madeira in 1851, and said to have been brought in with some imported plants. Included amongst these were some French varieties, which are thought to have been infected by the fungus.
The disease spread rapidly throughout the island encouraged by the subtropical, warm and humid climate. It attacked the areas of Funchal and Machico with particular force, and devastated the majority of the island’s vineyards, resulting in a predictable decimation of production and quality of wine. The effect it had on the island’s economy was quickly felt; given that viniculture was the main source of earnings. In only three years (1852 – 1854) the production averages fell from 50,000 hl to only 600 hl.
Brushing the vines with sulphur proved to be the best method of treating and preventing the disease. Some of the vines were saved; but this did not stop the farmers from turning their attention once again to the cultivation of sugar cane rather than replanting their vineyards.
PHYLLOXERA
One of the reasons that phylloxera successfully invaded Europe is because of the oidium plague, which resulted in growers turning to vine stock resistant to oidium.
This vine louse probably had a greater effect on the production of wine than any other plague or disease. Until phylloxera arrived, most vines were planted on their own roots, that is to say they were not grafted.
The desperate search for a remedy to the oidium crisis, led the
growers to plant the
Vitis Labrusca (Isabella) variety, which was oidium resistant, and first arrived on the island in 1865. However these proved to be carriers of an even more ferocious disease that would create a far greater devastation than the last, until a means of controlling phylloxera could be found.
The first symptoms of the disease were identified in São Gonçalo and São Roque in 1872, but it quickly spread throughout the island and was still active as late as 1908. It is estimated that in 1883, 80% or more of the island’s vineyards were infested by phylloxera.
In varieties susceptible to the disease, which includes those of the
Vitis vinifera species, (commonly known as viniferous or European stock) the louse feeds off the sap in the plant. The action of biting into the roots causes nodules and warts to grow, which develop into fissures, causing the root to rot. As the roots rot, the leaves on the vines begin to lose their colour, a sign that the vine is withering and soon to die.
In 1883, only 500 ha of the 2500 ha of vineyards planted before phylloxera struck were still extant.
The European varieties, that had once existed on the island and that had been the basis of the fame of Madeira wine, were almost completely wiped out. Malvasia survived only in Fajã dos Padres.
Just as in France, every effort was made to control and halt the progress of the plague. The practice of flooding the vineyards for some weeks during the winter, successfully tested in France, was not viable given the layout of the terrain.
Despite having had some limited success, the use of sulphide injections had no effect in most places.
It was the practice of grafting a European variety onto phylloxera resistant American root stock that proved to be the most successful way to combat the disease. As a result, the island’s vines were no longer planted on their own stock, but slowly replanted with the grafted varieties.
The resistance developed by American vines to phylloxera comes as result of the formation of layers of bark covering the wounds inflicted by the louse as it feeds. The formation of this protective layer successfully prevents the invasion of other fungi or bacterium, which would eventually lead the roots to rot, and the vine to die. As phylloxera is native to North America, it is no surprise that various endemic American root stocks have evolved a method of defence against this disease.
When these resistant varieties are attacked by the louse, their only reaction is the development of a small growth on their leaves, as the roots no longer suffer any real damage.
In 1882, the Anti-phylloxera commission on the island became responsible for the distribution and re-plantation of vineyards, using shoots of American varieties handed out for free to the growers. Two nurseries were established, and by 1883 some 60,000 vines had been distributed. However, it was not an easy task to replant the island’s vineyards. It took some time for the vine to regain its economic strength on the island; the growers were unmotivated, many of the English merchants had left the island, and the turmoil felt in one of the wine’s major markets, the English colonies, all contributed to the difficulties felt at the time.
Experience showed that not all the American varieties were able to adapt to the growing conditions on the island, or were incompatible with the traditional varieties. The preferred stocks were
Vitis riparia, Herbemont, Cunningham and Jacquet (Black Spanish), all of which were well suited to conditions on the island.