The Cotton bollworm, Helicoverpa armigera (Hünber), is one of the most important agricultural pests in China. Its seasonal migration, together with the ability in facultative diapause, is responsible for its pest status in different climatic regions. The region around Bohai Bay, where cotton bollworm occurs seriously in most of the years, is a major area for cotton and corn production in China. Therefore, it is extremely important to conduct experiments in the area on migration of cotton bollworm so that we...