當(dang)前，我(wo)省早稻大(da)部分處于(yu)孕穗期，中(zhong)稻處于(yu)移栽返(fan)青期，正是“兩(liang)遷”害(hai)蟲適宜為害(hai)期。從5月(yue)中(zhong)旬開(kai)始，全省各地燈下陸續監測到稻飛(fei)虱和稻縱(zong)卷葉螟遷入，目前已在部分田間造成為害(hai)。
我(wo)省今年(nian)(nian)白背飛(fei)虱燈下3月(yue)17日(ri)始見，比去(qu)年(nian)(nian)早(zao)12天(tian)，全省水稻監測點(dian)4月(yue)單(dan)燈單(dan)日(ri)白背飛(fei)虱平(ping)(ping)均蟲(chong)量19.8頭(tou)(tou)(tou)(tou)(tou)，是(shi)歷(li)年(nian)(nian)同期的7.1倍(bei)，接(jie)近大(da)發生(sheng)的2007年(nian)(nian)；5月(yue)至(zhi)6月(yue)初全省有6個(ge)縣市單(dan)燈單(dan)日(ri)蟲(chong)量過千頭(tou)(tou)(tou)(tou)(tou)，其(qi)中懷化(hua)靖州(zhou)縣5月(yue)27日(ri)最(zui)高(gao)誘蟲(chong)8800頭(tou)(tou)(tou)(tou)(tou)。目前(qian)全省田間蟲(chong)量較高(gao)，各(ge)市州(zhou)一般蟲(chong)量79～674.5頭(tou)(tou)(tou)(tou)(tou)，全省早(zao)稻百(bai)兜蟲(chong)量加平(ping)(ping)361.2頭(tou)(tou)(tou)(tou)(tou)，中稻443.4頭(tou)(tou)(tou)(tou)(tou)，全省21個(ge)縣百(bai)兜蟲(chong)量超過500頭(tou)(tou)(tou)(tou)(tou)，其(qi)中城步、新寧、臨(lin)武、嘉禾和江(jiang)華縣百(bai)兜蟲(chong)量過千頭(tou)(tou)(tou)(tou)(tou)，城步最(zui)高(gao)，達到2085頭(tou)(tou)(tou)(tou)(tou)。
稻(dao)(dao)縱卷葉螟今年(nian)(nian)4月(yue)10日(ri)(ri)(ri)(ri)始見，比去年(nian)(nian)略晚。全(quan)省(sheng)燈(deng)下(xia)5月(yue)17-31日(ri)(ri)(ri)(ri)有(you)明顯遷入峰(feng)，武(wu)岡(gang)5月(yue)18-21日(ri)(ri)(ri)(ri)單(dan)燈(deng)單(dan)日(ri)(ri)(ri)(ri)誘(you)蟲65頭(tou)(tou)(tou)， 5月(yue)24-26日(ri)(ri)(ri)(ri)湘(xiang)鄉、道縣(xian)單(dan)燈(deng)單(dan)日(ri)(ri)(ri)(ri)分別(bie)誘(you)蟲111頭(tou)(tou)(tou)、143頭(tou)(tou)(tou)。全(quan)省(sheng)田(tian)間趕蛾(e)(e)高峰(feng)在5月(yue)18日(ri)(ri)(ri)(ri)-6月(yue)1日(ri)(ri)(ri)(ri)，早于去年(nian)(nian)和歷年(nian)(nian)；各監測點田(tian)間趕蛾(e)(e)單(dan)日(ri)(ri)(ri)(ri)平均(jun)蛾(e)(e)量(liang)73.9頭(tou)(tou)(tou)，是去年(nian)(nian)的(de)(de)1.4倍，為歷年(nian)(nian)的(de)(de)1.9倍，其(qi)(qi)中(zhong)邵東縣(xian)5月(yue)18-24日(ri)(ri)(ri)(ri)趕蛾(e)(e)平均(jun)每日(ri)(ri)(ri)(ri)達(da)1457頭(tou)(tou)(tou)，醴陵5月(yue)26-29日(ri)(ri)(ri)(ri)平均(jun)每日(ri)(ri)(ri)(ri)734頭(tou)(tou)(tou)，東安5月(yue)20-21日(ri)(ri)(ri)(ri)平均(jun)每日(ri)(ri)(ri)(ri)640頭(tou)(tou)(tou)。目(mu)前全(quan)省(sheng)田(tian)間畝幼蟲量(liang)一般(ban)在668～9461頭(tou)(tou)(tou)，但邵陽市高達(da)15501頭(tou)(tou)(tou)，全(quan)省(sheng)加平早稻(dao)(dao)田(tian)5931頭(tou)(tou)(tou)，中(zhong)稻(dao)(dao)6496頭(tou)(tou)(tou)，有(you)10個縣(xian)畝平蟲量(liang)過萬頭(tou)(tou)(tou)，其(qi)(qi)中(zhong)邵東和隆回(hui)縣(xian)分別(bie)達(da)到(dao)27615頭(tou)(tou)(tou)和22000頭(tou)(tou)(tou)。
據(ju)氣(qi)(qi)(qi)象部(bu)門預(yu)測(ce)，我(wo)(wo)省6月氣(qi)(qi)(qi)溫比(bi)正常偏高，降雨(yu)偏多，強降水、強對流災害性(xing)天氣(qi)(qi)(qi)多發，利于“兩遷(qian)(qian)”害蟲遷(qian)(qian)入(ru)(ru)，據(ju)資料顯示，我(wo)(wo)省主要蟲源(yuan)遷(qian)(qian)入(ru)(ru)地廣西、廣東當前蟲量高，有(you)充足(zu)蟲源(yuan)可(ke)遷(qian)(qian)入(ru)(ru)我(wo)(wo)省；湘中(zhong)以南普遍蟲量較(jiao)大。下(xia)階(jie)段(duan)，我(wo)(wo)省早稻(dao)(dao)將(jiang)進(jin)入(ru)(ru)破口抽穗期(qi)，中(zhong)稻(dao)(dao)將(jiang)進(jin)入(ru)(ru)分蘗期(qi)，都將(jiang)進(jin)入(ru)(ru)關鍵時期(qi)，各地植(zhi)保(bao)部(bu)門要加強“兩遷(qian)(qian)”害蟲監(jian)測(ce)，密切關注其發生動態，及時發布預(yu)測(ce)信息，科學(xue)有(you)效指導防控，嚴防“兩遷(qian)(qian)”暴發成(cheng)災。
