Tinta Negra, and Complexa are still present and in high use, but hybrid grapes were officially banned from wine production in 1979. Today, Madeira's primary markets are in the Benelux countries, France, where it is entirely used for cooking, salt and pepper having been added prior to bottling, and Germany; emerging markets are growing in Japan, the United Kingdom, and the United States. Viticulture Climate and geography The island of Madeira has an oceanic climate with some tropical influences. With high rainfall and average mean temperature of 66 °F (19 °C), the threats of fungal grape diseases and botrytis rot are constant viticultural hazards. To combat these threats, Madeira vineyards are often planted on low trellises, known as latada, that raise the canopy of the vine off the ground similar to a style used in the Vinho Verde region of Portugal. The terrain of the mountainous volcanic island is difficult to cultivate, so vineyards are planted on man-made terraces of red and brown basaltic bedrock. These terraces, known as poios, are very similar to the terraces of the Douro that make Port wine production possible. The use of mechanical harvesting and vineyard equipment is near impossible, making wine grape growing a costly endeavor on the island. Many vineyards have in the past been ripped up for commercial tourist developments or replanted with such products as bananas for commercial concerns. Some replanting is taking place on the island; however, the tourist trade is generally seen as a more lucrative business than wine-making. Most of the grapes, grown by around 2100 grape growers are from vines planted on small plots of land off of which the grape growers survive by making an income from a variety of different inter-grown crops. Grape varieties Approximately 85% of Madeira is produced with the red grape, Negra Mole. The four major white grape varieties used for Madeira production are (from sweetest to driest) Malvasia, Bual, Verdelho, and Sercial. These varieties also lend their names to Madeira labelling, as discussed below. Occasionally one sees Terrantez, Bastardo and Moscatel varieties, although these are now increasingly rare on the island because of oidium and phylloxera. After the phylloxera epidemic, many wines were "mislabelled" as containing one of these noble grape varieties, which were reinterpreted as "wine styles" rather than true varietal names. Since the epidemic, Tinta Negra (or Negra Mole) and Complexa are the workhorse varieties on the island