| radar observations of the autumn migration of the beet armyworm spodoptera exigua (lepidoptera: noctuidae) and other moths in northern china. | the autumn return migration of the beet armyworm spodoptera exigua hübner and other insects in northern china was observed with radar and with a simultaneously-operated searchlight trap and ground light-trap at a site in langfang, near beijing. the searchlight trap was found to be an efficient tool for trapping migrants and, operated alongside a ground light-trap, could distinguish migrant from locally-flying species. it was confirmed that s. exigua and some other species were high-altitude noct ... | 2003 | 12699532 |