3.Life Cycle 1-6 generations/year in China.2-3 in Northeast and mid-downstream of Yellow River;3-4 in mid-downstream of Yangtsz River;5-6 in Huanan area. Overwinter as grown larvae in stems,ear centers and root stubbles of corns.‰ 1-6 generations/year in China. 2-3 in Northeast and mid-downstream of Yellow River; 3-4 in mid-downstream of Yangtsz River; 5-6 in Huanan area. ‰ Overwinter as grown larvae in stems, ear centers and root stubbles of corns. 3. Life Cycle 3. Life Cycle