With a view of building up the economic base of the Greater East Asia Co-Prosperity Sphere, the Japanese Army envisioned using the islands as a source of agricultural products needed by its industry. For example, Japan had a surplus of sugar from Taiwan but, a severe shortage of cotton, so they tried to grow cotton on sugar lands with disastrous results. They lacked the seeds, pesticides, and technical skills to grow cotton. Jobless farm workers flocked to the cities, where there was minimal relief and few jobs. The Japanese Army also tried using cane sugar for fuel, castor beans and copra for oil, derris for quinine, cotton for uniforms, and abaca (hemp) for rope. The plans were very difficult to implement in the face of limited skills, collapsed international markets, bad weather, and transportation shortages. The program was a failure that gave very little help to Japanese industry, and diverted resources needed for food production.