20.高粱舟蛾、甘蔗天蛾
20. Mbajruzmegmax、mbajmbwnoij
高粱舟蛾主要为害高粱、玉米、甘蔗等作物。在广西蔗区局部有发生,时有暴发性出现。
Mbajruzmegmax cujyau gu h haih megmax、haeuxyangz、oij daengj doenghgo.Youq Guengjsae dieg oij mbangj miz fatseng, seiz mbouj seiz miz haenq fat okyienh.
形态特征 高粱舟蛾:成虫体长约 26毫米,头和胸背面浅黄色,后胸深褐色,前翅前缘暗灰色,后翅暗灰褐色,腹部橙黄色。卵扁圆形,初为乳黄白色略带青绿,后变白色,将孵化时呈现黑褐色的幼虫头壳。1龄幼虫头黑色,体污黄色,各节有数个粗大的黑色毛瘤,毛瘤处有紫红色斑;2龄幼虫体上的紫红色斑均变为黑色;老熟幼虫体长约70毫米,头黄褐色,体浅蓝绿色,背面粉绿色。蛹纺锤形,黑褐色。
Yienghsiengq daegdiemj Mbajruzmegmax:Nonhung ndang raez iek 26 hauzmij,gyaeuj caeuq aek baihlaeng saek henjdamh, aek laeng saek henjgeqlaeg,fwed naj henz naj saek mong’amq, fwed laeng saek henjgeqmong’amq,dungx saek henjgam.Gyaeq yiengh luenzbenj,co dwg saek henjhaugyaeq loq daiq heu loeg, doeklaeng bienq saek hau,yaek did seiz okyienh byukgyaeuj nonlwg saek henjgeqndaem. 1 lingz nonlwg gyaeuj saek ndaem, ndang saek uqhenj,gak hoh miz geij aen rou bwn saek ndaem cohung haenx,giz rou bwn miz raiz saek hoengzgyaemq; 2 lingz nonlwg gwnz ndang raiz saek hoengzgyaemq cungj bienz baenz saek ndaem; nonlwg lauxgeq ndang raez iek 70 hauzmij,gyaeuj saek henjgeq,ndang saek loeglamz damh,baihlaeng saek loeg faenj.Reh yiengh lumj lwt,saek henjgeq ndaem.
生活习性 高粱舟蛾在广西 I年可发生 3~4代,7~9月间,幼虫可在甘蔗上为害。成虫有趋光性和假死性,白天静伏。在中、下部蔗叶或蔗地边植物丛中。初孵幼虫群集在叶背,从叶表面啃食叶肉。随龄期增大,幼虫吐丝飘移分散为害,2龄以后,从叶缘向内咬食,叶片呈缺刻状,进人5龄为暴食期,每叶多为1头为害,可将叶片上部全吃光.仅剩中脉。幼虫期约1个月,老熟幼虫离开蔗叶人土做室化蛹。一般高温多湿的环境有利于其发生。甘蔗天蛾成虫具趋光性,飞翔能力强;幼虫取食蔗叶,每年7~9月可见为害,老熟后人土化蛹。
Swnghhoz gvenqsingq Mbajruzmegmax youq Guengjsae 1 bi ndaej fatseng 3~4 daih,7~9 nyied ndawde,nonlwg ndaej youq gwnz oij guh haih.Nonhung miz angj rongh caeuq gyaj dai, doengxngoenz caem boemz.Youq mbaw oij donh gyang、donh laj roxnaeuz henz dieg oij caz doenghgo ndawde.Nonlwg ngam did gyoengq comz youq laeng mbaw,daj rog mbaw gaet gwn noh mbaw.Riengz geiz lingz dem hung,nonlwg haiz sei senjbyaij faensanq guh haih, 2 lingz gvaq le,daj henz mbaw yiengq ndaw gaet gwn,mbaw yienh yiengh gietgaek,haeuj daengz 5 lingz dwg geiz ak gwn,moix mbaw lai dwg duz ndeu guh haih,ndaej dawz mbaw donh gwnz gwn liux bae,cij lw meg gyang.Geiz nonlwg iek ndwen he,nonlwg lauxgeq liz mbaw haeuj namh guh rug baenz reh.Itbuen mbwn hwngq dumz lai miz leih de fatseng. Mbajmbwn’oij nonhung miz angj rongh,gig ak mbin;nonlwg aeu gwn mbaw oij,moix bi 7~9 nyied ndaej raen guh haih,lauxgeq le haeuj namh baenz reh.
防治方法 ①人工捕捉成虫和幼虫。②针对低龄幼虫喷洒农药,可选用90%晶体敌百虫800倍稀释液,80%敌敌畏乳油1000倍稀释液,92%杀虫丹或40%特力克均为 1000倍稀释液,24%万灵 1000倍稀释液,10%灭百可或2.5%敌杀死均为2000~3000 倍稀释液。
Fuengzceih fuengfap ①Vunz gaeb nonhung caeuq nonlwg. ②Cimdoiq nonlwg geiz daemq byoq yw,ndaej genjyungh 90% cinghdij dizbwzcungz 800 boix raemxyw saw,80% dizdizvei yujyouz 1000 boix raemxyw saw,92% sazcungzdanh roxnaeuz 40% dwzlizgwz cungj dwg 1000 boix raemxyw saw,24% vanlingz 1000 raemxyw saw,10% mezbwzgoj roxnaeuz 2.5% dizsazswj cungj dwg 2000~3000 boix raemxyw saw.
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