A follow-up paper by Oleg at a conference in Korea in 2004, reported that application of these two recommendations had greatly reduced crop depredations. The cooperative farms had moved most crop fields 10-15 km from the lake, still within easy commuting distance of hungry cranes. But with the addition of lure crops of millet and bristlegrass (Setaria viridis) in the fields near the lake, crane numbers in crop fields dropped by 90%. Those cranes that fed in crop fields primarily used harvested fields where they cause no damage. Geese and shelducks seldom used crop fields after the lure crop program began. Through fecal analysis, Oleg had discovered that millet and green bristlegrass were preferred over wheat by cranes and waterfowl. Millet and bristlegrass are annuals which reseed themselves easily. These lure grasses can be maintained with little effort. All that is necessary is occasional disking to reduce weeds and improve the seedbed for these grasses. Where cooperative farmers once clamored for government restitution, they now support the entire lure crop program. They found that it costs only 5-10% of the value of previous damages to maintain the lure crop fields.