一、早稻(dao)前期主要病蟲發生(sheng)概況(kuang)
受前期(qi)低溫氣候(hou)影響，雖然我區春(chun)(chun)播春(chun)(chun)種(zhong)(zhong)進度比(bi)(bi)去年(nian)同期(qi)稍(shao)快，但與(yu)正常年(nian)份相比(bi)(bi)，仍屬偏(pian)(pian)慢。全區早稻(dao)面積比(bi)(bi)去年(nian)有所增(zeng)加(jia)(jia)。據(ju)5月22日(ri)農情(qing)統計(ji)，全區早稻(dao)插秧面積1467.48萬(wan)畝，占計(ji)劃種(zhong)(zhong)植的(de)(de)(de)100.32%，同比(bi)(bi)多(duo)42.66萬(wan)畝，高3個(ge)百分(fen)點。受氣候(hou)因(yin)子(zi)及水(shui)稻(dao)種(zhong)(zhong)植進度的(de)(de)(de)影響，水(shui)稻(dao)主要病蟲發生期(qi)大(da)多(duo)偏(pian)(pian)早至(zhi)接近上年(nian)，病害(hai)的(de)(de)(de)流行(xing)期(qi)偏(pian)(pian)早。進入(ru)5月中(zhong)旬后(hou)，水(shui)稻(dao)生長陸續(xu)進入(ru)分(fen)蘗盛期(qi)，部分(fen)早插田已進入(ru)幼穗分(fen)化(hua)(hua)期(qi)，加(jia)(jia)上頻繁的(de)(de)(de)雨日(ri)，因(yin)此部分(fen)水(shui)稻(dao)病蟲偏(pian)(pian)重發生。與(yu)去年(nian)同期(qi)相比(bi)(bi)：稻(dao)飛虱、三(san)化(hua)(hua)螟偏(pian)(pian)輕，稻(dao)葉瘟、紋(wen)枯(ku)病、稻(dao)縱卷葉螟偏(pian)(pian)重。
1、稻(dao)(dao)葉(xie)瘟 發(fa)(fa)生程度(du)為(wei)1（3）級，該病(bing)在桂東(dong)南部分(fen)、桂中局部稻(dao)(dao)區及(ji)其它稻(dao)(dao)區的歷史性發(fa)(fa)生區均(jun)有不同(tong)程度(du)發(fa)(fa)生，發(fa)(fa)生比上年同(tong)期偏重。4月(yue)中旬(xun)初開始發(fa)(fa)病(bing)，始見期接近去年；5月(yue)中旬(xun)后陸續進(jin)入流行期，比上年偏早。統計(ji)防城等(deng)38個縣(xian)（市、區）前期調(diao)查(cha)，發(fa)(fa)生面積49.3萬畝，比上年同(tong)期增加46.5%。病(bing)葉(xie)率一般0.3%~7.4%，高(gao)(gao)的10.1%~29.4%，桂東(dong)南少數(shu)田塊更是高(gao)(gao)達44.0%~83.0%；病(bing)情指數(shu)一般為(wei)0.1~1.9，高(gao)(gao)的2.0~4.3。
2、稻紋枯(ku)病(bing) 發生程度為(wei)1（2）級，較(jiao)上年(nian)同(tong)期重。各(ge)地始見(jian)期桂(gui)南為(wei)4月下旬，桂(gui)北為(wei)5月上旬，始見(jian)期接近(jin)去年(nian)，流行(xing)期偏(pian)早(zao)(zao)。統計防城等(deng)39個縣(xian)（市、區）前期調查，發生面(mian)積(ji)100.8萬畝，比上年(nian)同(tong)期增57.2%。目前沿(yan)海及桂(gui)東(dong)南部(bu)分稻區病(bing)情已進入流行(xing)期。病(bing)叢率一(yi)般1.4%~18.2%，高的26.0%~40.0%，沿(yan)海合浦縣(xian)部(bu)分早(zao)(zao)插(cha)田塊高達(da)(da)36.4%~67.0%；病(bing)株率一(yi)般0.6%~7.2%，高的11.3%~39.0%；病(bing)指一(yi)般為(wei)0.3~1.6，高的2.8~5.6，沿(yan)海部(bu)分稻區高達(da)(da)12.5~15.1。
3、稻飛虱 發(fa)(fa)生(sheng)程(cheng)度為(wei)(wei)2（4）級，發(fa)(fa)生(sheng)偏(pian)早，總體比上年同期(qi)輕。重發(fa)(fa)區(qu)在沿海大部、桂南部分及桂中(zhong)、桂北的(de)局部。其發(fa)(fa)生(sheng)特(te)點為(wei)(wei)遷入早、峰次多、遷入量(liang)大。
測燈監測 始見(jian)期(qi)與上(shang)年(nian)接近，但(dan)明(ming)顯(xian)遷(qian)入(ru)峰(feng)偏早(zao)。始見(jian)期(qi)出(chu)現(xian)在3月(yue)(yue)上(shang)旬初，接近上(shang)年(nian)，3月(yue)(yue)1日(ri)(ri)(ri)，都安縣(xian)(xian)測燈下已(yi)誘(you)到稻(dao)(dao)飛(fei)虱。但(dan)就(jiu)全區(qu)范圍(wei)而言，大(da)(da)部(bu)稻(dao)(dao)區(qu)特別(bie)是桂(gui)(gui)南稻(dao)(dao)區(qu)的(de)稻(dao)(dao)飛(fei)虱燈下始見(jian)期(qi)是比(bi)(bi)上(shang)年(nian)偏遲，主降(jiang)區(qu)相對(dui)集(ji)中。3月(yue)(yue)中旬中起(qi)，稻(dao)(dao)飛(fei)虱陸續遷(qian)入(ru)沿(yan)(yan)海(hai)(hai)稻(dao)(dao)區(qu)。4月(yue)(yue)7~14日(ri)(ri)(ri)，廣西出(chu)現(xian)第(di)一(yi)個(ge)范圍(wei)比(bi)(bi)較(jiao)廣，遷(qian)人(ren)量(liang)(liang)比(bi)(bi)較(jiao)大(da)(da)的(de)遷(qian)入(ru)過程，比(bi)(bi)上(shang)年(nian)偏早(zao)8天(tian)。主降(jiang)區(qu)為(wei)沿(yan)(yan)海(hai)(hai)大(da)(da)部(bu)及(ji)桂(gui)(gui)中、桂(gui)(gui)北(bei)(bei)局部(bu)。統計45個(ge)縣(xian)(xian)（市(shi)、區(qu)）4月(yue)(yue)6~15日(ri)(ri)(ri)燈下誘(you)蟲總量(liang)(liang)為(wei)49543頭(tou)，比(bi)(bi)上(shang)年(nian)同(tong)(tong)期(qi)增(zeng)339%，比(bi)(bi)常年(nian)同(tong)(tong)期(qi)增(zeng)354%；褐(he)(he)飛(fei)虱比(bi)(bi)例占(zhan)(zhan)35.7%，上(shang)年(nian)同(tong)(tong)期(qi)褐(he)(he)飛(fei)虱比(bi)(bi)例僅(jin)占(zhan)(zhan)12.2%。4月(yue)(yue)27日(ri)(ri)(ri)~5月(yue)(yue)5日(ri)(ri)(ri)，廣西出(chu)現(xian)第(di)二個(ge)比(bi)(bi)較(jiao)明(ming)顯(xian)的(de)遷(qian)入(ru)過程，主降(jiang)區(qu)落在沿(yan)(yan)海(hai)(hai)大(da)(da)部(bu)、桂(gui)(gui)東(dong)南、桂(gui)(gui)西南、桂(gui)(gui)中部(bu)分及(ji)桂(gui)(gui)北(bei)(bei)局部(bu)稻(dao)(dao)區(qu)。統計43個(ge)縣(xian)(xian)（市(shi)、區(qu)）4月(yue)(yue)26日(ri)(ri)(ri)~5月(yue)(yue)5日(ri)(ri)(ri)燈下誘(you)蟲總量(liang)(liang)為(wei)168877頭(tou)，比(bi)(bi)上(shang)年(nian)同(tong)(tong)期(qi)（91208頭(tou)）增(zeng)85%，比(bi)(bi)常年(nian)（38021頭(tou)）增(zeng)344%；褐(he)(he)飛(fei)虱比(bi)(bi)例占(zhan)(zhan)6.4%，上(shang)年(nian)同(tong)(tong)期(qi)褐(he)(he)飛(fei)虱比(bi)(bi)例占(zhan)(zhan)8.3%。
田(tian)(tian)(tian)間(jian)(jian)動(dong)態(tai) 由(you)于今年(nian)(nian)稻(dao)(dao)(dao)(dao)飛虱遷(qian)入(ru)(ru)峰(feng)早(zao)(zao)(zao)、峰(feng)次多、遷(qian)入(ru)(ru)量(liang)(liang)大，沿海稻(dao)(dao)(dao)(dao)區(qu)早(zao)(zao)(zao)稻(dao)(dao)(dao)(dao)前期(qi)田(tian)(tian)(tian)間(jian)(jian)稻(dao)(dao)(dao)(dao)飛虱發生(sheng)(sheng)之(zhi)早(zao)(zao)(zao)、蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)之(zhi)高(gao)為近(jin)(jin)年(nian)(nian)罕見。第一代在廣(guang)西常年(nian)(nian)都是輕發生(sheng)(sheng)，基本(ben)(ben)不(bu)用防(fang)治(zhi)(zhi)，但今年(nian)(nian)4月上(shang)(shang)(shang)旬(xun)中始，受降雨和對(dui)流天氣(qi)影響，稻(dao)(dao)(dao)(dao)飛虱大量(liang)(liang)遷(qian)入(ru)(ru)，沿海部分(fen)稻(dao)(dao)(dao)(dao)區(qu)田(tian)(tian)(tian)間(jian)(jian)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)已(yi)超過(guo)防(fang)治(zhi)(zhi)指(zhi)(zhi)標，局(ju)(ju)部甚至達(da)(da)到(dao)大發生(sheng)(sheng)程度(du)(du)。4月中旬(xun)初各(ge)地(di)(di)田(tian)(tian)(tian)間(jian)(jian)調查(cha)(cha)(cha)：沿海稻(dao)(dao)(dao)(dao)區(qu)的(de)(de)早(zao)(zao)(zao)插田(tian)(tian)(tian)百叢(cong)(cong)蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)一般(ban)(ban)200~500頭(tou)(tou)，高(gao)的(de)(de)850~1800頭(tou)(tou)，欽北(bei)(bei)及欽南(nan)兩區(qu)局(ju)(ju)部田(tian)(tian)(tian)塊(kuai)高(gao)達(da)(da)4000~10000頭(tou)(tou)，蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)之(zhi)高(gao)為歷史少(shao)(shao)見。隨著(zhu)境外蟲(chong)(chong)(chong)(chong)(chong)源的(de)(de)不(bu)斷遷(qian)入(ru)(ru)，田(tian)(tian)(tian)間(jian)(jian)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)持續(xu)上(shang)(shang)(shang)升，4月下(xia)旬(xun)各(ge)地(di)(di)調查(cha)(cha)(cha)，桂(gui)南(nan)及沿海稻(dao)(dao)(dao)(dao)區(qu)的(de)(de)部分(fen)早(zao)(zao)(zao)插濃綠田(tian)(tian)(tian)塊(kuai)，百叢(cong)(cong)蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)一般(ban)(ban)840~2531頭(tou)(tou)，高(gao)的(de)(de)4500~6140頭(tou)(tou)，以(yi)低齡若蟲(chong)(chong)(chong)(chong)(chong)為主。經(jing)過(guo)防(fang)治(zhi)(zhi)后，各(ge)地(di)(di)田(tian)(tian)(tian)間(jian)(jian)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)有所(suo)下(xia)降，除沿海稻(dao)(dao)(dao)(dao)區(qu)密(mi)(mi)度(du)(du)仍較高(gao)外，其(qi)余(yu)稻(dao)(dao)(dao)(dao)區(qu)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)大部皆在防(fang)治(zhi)(zhi)指(zhi)(zhi)標以(yi)下(xia)。欽北(bei)(bei)區(qu)、欽南(nan)、浦北(bei)(bei)、防(fang)城區(qu)等(deng)地(di)(di)平均蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)在1110～1947頭(tou)(tou)/百叢(cong)(cong)，高(gao)的(de)(de)2700～4242頭(tou)(tou)/百叢(cong)(cong)。其(qi)余(yu)稻(dao)(dao)(dao)(dao)區(qu)百叢(cong)(cong)蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)一般(ban)(ban)150～579頭(tou)(tou)，高(gao)的(de)(de)達(da)(da)1005～2150頭(tou)(tou)。統計防(fang)城等(deng)41個(ge)縣（市(shi)、區(qu)）前期(qi)調查(cha)(cha)(cha)，發生(sheng)(sheng)面積198.7萬畝(mu)，同比(bi)減少(shao)(shao)18.1%。5月中旬(xun)，隨著(zhu)境外蟲(chong)(chong)(chong)(chong)(chong)源不(bu)斷遷(qian)入(ru)(ru)及本(ben)(ben)地(di)(di)蟲(chong)(chong)(chong)(chong)(chong)源的(de)(de)繁殖，田(tian)(tian)(tian)間(jian)(jian)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)比(bi)上(shang)(shang)(shang)旬(xun)有所(suo)上(shang)(shang)(shang)升。各(ge)地(di)(di)調查(cha)(cha)(cha)，除玉林市(shi)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)比(bi)上(shang)(shang)(shang)年(nian)(nian)同期(qi)（大發生(sheng)(sheng)年(nian)(nian)）偏少(shao)(shao)外，其(qi)它大部稻(dao)(dao)(dao)(dao)區(qu)的(de)(de)蟲(chong)(chong)(chong)(chong)(chong)口(kou)(kou)(kou)(kou)(kou)密(mi)(mi)度(du)(du)接近(jin)(jin)上(shang)(shang)(shang)年(nian)(nian)。沿海大部、桂(gui)東(dong)南(nan)部分(fen)及桂(gui)西南(nan)、桂(gui)西北(bei)(bei)局(ju)(ju)部稻(dao)(dao)(dao)(dao)區(qu)百叢(cong)(cong)蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)一般(ban)(ban)1000~2800頭(tou)(tou)，高(gao)的(de)(de)3300~7500頭(tou)(tou)，沿海局(ju)(ju)部田(tian)(tian)(tian)塊(kuai)達(da)(da)萬頭(tou)(tou)以(yi)上(shang)(shang)(shang)；其(qi)余(yu)稻(dao)(dao)(dao)(dao)區(qu)百叢(cong)(cong)蟲(chong)(chong)(chong)(chong)(chong)量(liang)(liang)一般(ban)(ban)88～350頭(tou)(tou)，高(gao)的(de)(de)達(da)(da)550～850頭(tou)(tou)。大部稻(dao)(dao)(dao)(dao)區(qu)田(tian)(tian)(tian)間(jian)(jian)以(yi)若蟲(chong)(chong)(chong)(chong)(chong)為主。
4、稻(dao)縱(zong)卷(juan)葉螟 發(fa)(fa)生(sheng)(sheng)(sheng)程度2（4）級，發(fa)(fa)生(sheng)(sheng)(sheng)早，面廣量(liang)(liang)多(duo)。重(zhong)(zhong)(zhong)發(fa)(fa)區(qu)(qu)在桂(gui)南及沿海(hai)大部(bu)(bu)(bu)和桂(gui)中(zhong)(zhong)(zhong)(zhong)、桂(gui)北(bei)的(de)(de)(de)局(ju)部(bu)(bu)(bu)稻(dao)區(qu)(qu)。據防城等(deng)41個縣(xian)（市(shi)、區(qu)(qu)）前(qian)期調查：發(fa)(fa)生(sheng)(sheng)(sheng)面積182.5萬(wan)畝(mu)(mu)，比上年(nian)同期增(zeng)34.2%。3月(yue)下(xia)旬初各地(di)始見成(cheng)蟲(chong)(chong)(chong)，4月(yue)中(zhong)(zhong)(zhong)(zhong)旬初沿海(hai)部(bu)(bu)(bu)分(fen)稻(dao)區(qu)(qu)發(fa)(fa)生(sheng)(sheng)(sheng)已(yi)較重(zhong)(zhong)(zhong)，百(bai)叢(cong)幼(you)(you)(you)蟲(chong)(chong)(chong)量(liang)(liang)一(yi)般為(wei)30~89頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，多(duo)的(de)(de)(de)達(da)100~150頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，局(ju)部(bu)(bu)(bu)高(gao)(gao)達(da)300~500頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)。4月(yue)下(xia)旬以來稻(dao)縱(zong)卷(juan)葉螟大量(liang)(liang)遷入我區(qu)(qu)，田(tian)(tian)間蟲(chong)(chong)(chong)量(liang)(liang)比常(chang)年(nian)明顯(xian)偏多(duo)。桂(gui)南、桂(gui)中(zhong)(zhong)(zhong)(zhong)部(bu)(bu)(bu)分(fen)及桂(gui)北(bei)的(de)(de)(de)局(ju)部(bu)(bu)(bu)稻(dao)區(qu)(qu)發(fa)(fa)生(sheng)(sheng)(sheng)尤為(wei)嚴(yan)重(zhong)(zhong)(zhong)，5月(yue)上旬調查，畝(mu)(mu)蛾量(liang)(liang)一(yi)般1034~3677頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，高(gao)(gao)的(de)(de)(de)5400~8954頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，永福和興安縣(xian)的(de)(de)(de)局(ju)部(bu)(bu)(bu)雜草上及欽北(bei)、平(ping)南、扶(fu)綏、西(xi)鄉(xiang)塘、憑祥(xiang)、融(rong)(rong)水(shui)、環江(jiang)、平(ping)果等(deng)縣(xian)（區(qu)(qu)）局(ju)部(bu)(bu)(bu)發(fa)(fa)生(sheng)(sheng)(sheng)嚴(yan)重(zhong)(zhong)(zhong)的(de)(de)(de)田(tian)(tian)塊(kuai)畝(mu)(mu)蛾量(liang)(liang)皆(jie)在萬(wan)頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)以上，其中(zhong)(zhong)(zhong)(zhong)扶(fu)綏、平(ping)果、大化(hua)、融(rong)(rong)水(shui)縣(xian)畝(mu)(mu)最(zui)高(gao)(gao)蛾量(liang)(liang)依次達(da)66667頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)、44111頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)、51359頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)、40020頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，百(bai)叢(cong)卵(luan)粒一(yi)般100～500粒，高(gao)(gao)的(de)(de)(de)達(da)670～900粒；百(bai)叢(cong)幼(you)(you)(you)蟲(chong)(chong)(chong)量(liang)(liang)一(yi)般為(wei)30~87頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，高(gao)(gao)的(de)(de)(de)106~300頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，柳(liu)江(jiang)、憑祥(xiang)縣(xian)局(ju)部(bu)(bu)(bu)田(tian)(tian)塊(kuai)更是高(gao)(gao)達(da)480~500頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)。隨著卵(luan)粒的(de)(de)(de)陸續孵化(hua)，田(tian)(tian)間幼(you)(you)(you)蟲(chong)(chong)(chong)密度劇(ju)增(zeng)。5月(yue)中(zhong)(zhong)(zhong)(zhong)旬中(zhong)(zhong)(zhong)(zhong)調查，在發(fa)(fa)生(sheng)(sheng)(sheng)嚴(yan)重(zhong)(zhong)(zhong)的(de)(de)(de)桂(gui)南、桂(gui)中(zhong)(zhong)(zhong)(zhong)及桂(gui)北(bei)部(bu)(bu)(bu)分(fen)稻(dao)區(qu)(qu)百(bai)叢(cong)幼(you)(you)(you)蟲(chong)(chong)(chong)量(liang)(liang)一(yi)般為(wei)100~280頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，高(gao)(gao)的(de)(de)(de)335~805頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，桂(gui)西(xi)南平(ping)果縣(xian)局(ju)部(bu)(bu)(bu)田(tian)(tian)塊(kuai)更是高(gao)(gao)達(da)1137~3400頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)。經(jing)防治后，大部(bu)(bu)(bu)稻(dao)區(qu)(qu)殘(can)蟲(chong)(chong)(chong)量(liang)(liang)降至3~5頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)/百(bai)叢(cong)，多(duo)的(de)(de)(de)達(da)70~80頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，局(ju)部(bu)(bu)(bu)防治欠佳田(tian)(tian)塊(kuai)仍高(gao)(gao)達(da)100頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)以上。目(mu)前(qian)田(tian)(tian)間蟲(chong)(chong)(chong)態復(fu)雜，成(cheng)蟲(chong)(chong)(chong)、卵(luan)、幼(you)(you)(you)蟲(chong)(chong)(chong)三種蟲(chong)(chong)(chong)態并存，部(bu)(bu)(bu)分(fen)田(tian)(tian)塊(kuai)密度較大。畝(mu)(mu)成(cheng)蟲(chong)(chong)(chong)一(yi)般為(wei)60~370頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，高(gao)(gao)的(de)(de)(de)510~1600頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)；百(bai)叢(cong)幼(you)(you)(you)蟲(chong)(chong)(chong)量(liang)(liang)一(yi)般為(wei)50~180頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，高(gao)(gao)的(de)(de)(de)216~468頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)，宜州(zhou)、融(rong)(rong)水(shui)、柳(liu)江(jiang)等(deng)縣(xian)部(bu)(bu)(bu)分(fen)田(tian)(tian)塊(kuai)百(bai)叢(cong)幼(you)(you)(you)蟲(chong)(chong)(chong)量(liang)(liang)仍高(gao)(gao)達(da)600頭(tou)(tou)(tou)(tou)(tou)(tou)(tou)以上；百(bai)叢(cong)卵(luan)量(liang)(liang)一(yi)般30~85粒，高(gao)(gao)的(de)(de)(de)135~285粒。
5、三化螟 發(fa)生(sheng)程度為2級，比去(qu)年同期(qi)偏(pian)輕。主要發(fa)生(sheng)區域(yu)在(zai)桂(gui)(gui)中(zhong)(zhong)(zhong)大部(bu)及桂(gui)(gui)南(nan)局部(bu)稻區。越(yue)冬代成蟲盛發(fa)期(qi)桂(gui)(gui)南(nan)在(zai)3月(yue)下旬到(dao)4月(yue)上旬中(zhong)(zhong)(zhong)，桂(gui)(gui)中(zhong)(zhong)(zhong)桂(gui)(gui)北(bei)在(zai)4月(yue)中(zhong)(zhong)(zhong)旬。統計防(fang)城等41個縣（市、區）前期(qi)調查，發(fa)生(sheng)面積26.4萬(wan)畝(mu)，同比減29.2%。目前田間(jian)第一代三化螟畝(mu)殘蟲量一般20~220頭(tou)，高的310~905頭(tou)，局部(bu)高的達1300~9600頭(tou)；為害率一般0.1%~0.8%，高的1.3%~5.0%。
此(ci)外，稻赤枯病、水稻葉水蠅、二化(hua)螟、稻象(xiang)甲、稻薊馬(ma)、稻根(gen)結線蟲、稻蝗在局部(bu)稻區也有(you)不同(tong)程度(du)發(fa)生。
二、中后期(qi)主要病蟲(chong)發生趨勢
預(yu)計全區早稻中(zhong)后期(qi)病蟲為(wei)中(zhong)等偏重(zhong)程(cheng)度(du)局部大(da)發生(sheng)，其中(zhong)稻縱(zong)卷葉螟發生(sheng)將比上年偏重(zhong)。
1、稻(dao)瘟(wen)(wen)病(bing) 預計發(fa)生(sheng)(sheng)程度為中等(deng)偏輕、局部中等(deng)偏重，種植感(gan)病(bing)品(pin)種較(jiao)多(duo)的歷史(shi)(shi)性(xing)發(fa)生(sheng)(sheng)區穗頸瘟(wen)(wen)流行幾率較(jiao)大。發(fa)生(sheng)(sheng)面積360萬畝，發(fa)生(sheng)(sheng)主要區域(yu)為桂東北、桂東南、右(you)江河谷的歷史(shi)(shi)性(xing)發(fa)生(sheng)(sheng)區及種植感(gan)病(bing)品(pin)種較(jiao)多(duo)的稻(dao)區。葉(xie)瘟(wen)(wen)流行盛期將持續至(zhi)6月下旬(xun)(xun)末；穗頸瘟(wen)(wen)流行期為6月中旬(xun)(xun)至(zhi)7月中旬(xun)(xun)初。
2、稻紋枯病(bing) 預計發(fa)生(sheng)程度為中等偏重、局部(bu)大發(fa)生(sheng)。發(fa)生(sheng)面積950萬畝(mu)。水稻孕穗至灌漿期(qi)為流行高峰期(qi)。
3、稻(dao)飛虱 預(yu)計發生(sheng)(sheng)(sheng)程度為大發生(sheng)(sheng)(sheng)。發生(sheng)(sheng)(sheng)面積1100萬畝(mu)。發生(sheng)(sheng)(sheng)盛(sheng)期在6月(yue)至(zhi)7月(yue)上旬，其(qi)中6月(yue)上中旬為發生(sheng)(sheng)(sheng)高峰。全區(qu)普遍發生(sheng)(sheng)(sheng)。
4、稻縱卷葉螟 預計發(fa)生(sheng)程度為中等偏重局部大發(fa)生(sheng)。發(fa)生(sheng)面積950萬畝。發(fa)生(sheng)為害盛期在6月上、中旬。全區普遍發(fa)生(sheng)。
5、三(san)化螟(ming) 預計全區(qu)(qu)(qu)為中(zhong)等偏輕(qing)、局部中(zhong)等偏重(zhong)程(cheng)度(du)發生。發生的主要區(qu)(qu)(qu)域(yu)為桂(gui)東北(bei)、桂(gui)中(zhong)大部及右江(jiang)河谷、桂(gui)南(nan)部分稻區(qu)(qu)(qu)。發生面積290萬(wan)畝。第二代蟻螟(ming)盛期在(zai)6月中(zhong)旬至(zhi)7月上旬。
6、鼠害 預計中等偏輕、局部中等程(cheng)度發生(sheng)。發生(sheng)面積900萬畝。
7、二化螟 預計(ji)輕(qing)發(fa)(fa)生局部中(zhong)等程(cheng)度發(fa)(fa)生，桂林市(shi)北部將(jiang)達中(zhong)等程(cheng)度發(fa)(fa)生。發(fa)(fa)生面積50萬畝。
來源(yuan)：廣(guang)西(xi)壯族自治區農作(zuo)物病蟲(chong)測報站
