| [biological characteristics and occurrence regularity of phassus excrescens bulter]. | the biological characterisitics and occurrence regularity of phassus excrescens were studied from 1997 to 2000 in the eastern part of heilongjiang province and jilin province. in this area, most of its individuals took two years to finish one generation, and over-wintered two times with eggs and larvae, respectively. at the end of june or the first ten days of july, larvae transferred to damage fraxinus mandshurica. feeding with artificial diet indoor, the larvae finished 6 instars before pupati ... | 2000 | 11767538 |