In the late eighteen hundreds, Dutch colonialists established large coffee plantations on the Ijen Plateau in eastern Java. However, disaster struck in the 1876, when the coffee rust disease, Hemileia vastatrix, swept through Indonesia, wiping out most of the Arabica Typica cultivar. Robusta coffee (C. canephor var. robusta) was introduced to East Java in 1900 as a substitute, especially at lower altitudes, where the rust was particularly devastating. Robusta coffee was introduced to smallholders around Kerinci around 1915, and then spread quickly across southern Sumatra during the 1920s, where production soon eclipsed Java. The region remains the most important producing region by volume today.