Already, these hazards have chipped away at the centuries-old culture of wasabi in the area and imperilled the future of one of the prefecture's most important agricultural products and a pillar of its tourism business. Over the last decade, the volume of wasabi produced in Shizuoka has declined by close to 55 per cent, according to the Ministry of Agriculture, Forestry and Fisheries. "I have a sense of crisis," said Hiroyuki Mochizuki, president of Tamaruya, a 147-year-old company in Shizuoka that processes wasabi to sell in tubes, as well as in salad dressings, flavoured salts, pickles and even nostril-tickling chocolate. "In order to protect Japanese food culture," he added, "it is important to protect wasabi."