The brown stink bug (BSB),Euschistus servus (Say) (Hemiptera:Pentatomidae),is a serious economic pest of co production in the southeaste United States.The BSB population dynamics was monitored for 17 weeks from tasseling to preharvest of co plants (i.e.,late May to mid-September) using pheromone traps in three co fields from 2005 to 2009.The trap data showed two peaks in early June and mid-August,respectively.The relationship between trap catch and pregrowing season weather data was examined using correlation and stepwise multiple factor regression analyses.Weather indices used for the analyses were accumulated growing degree day (AGDD),number of days with minimum temperature below 0 ℃ (Subz),accumulated daily maximum (AMaxT) and minimum temperatures (AMinT) and rainfall (ARain).The weather indices were calculated with lower (10 ℃) and upper (35 ℃) as biological thresholds.The parameters used in regression analysis were seasonal abundance (or overall mean of BSB adult catch)(BSBm),number of BSB adults caught at a peak (PeakBSB),and peak week (Peakwk).The BSBm was negatively related to high temperature (AmaxT or AGDD) consistently,whereas lstPeakBSB was positively correlated to both ARain and Subz,irrespective of weather data durations (the first 4,4.5,and 5 months).In contrast,the 7-month weather data (AGDD7) were negatively correlated to the BSBm only,but not correlated to the second PeakBSB.The 5-year monitoring study demonstrated that weather data can be used to predict the BSB abundance at its first peak in tasseling co fields in the southeaste U.S.states.