王竹紅 葛均青 劉紫晶
摘要 草地貪夜蛾Spodoptera frugiperda (J.E.Smith)是世界重要農(nóng)業(yè)害蟲(chóng),具有很強(qiáng)的遷飛性,對(duì)玉米等禾本科植物造成危害。調(diào)查草地貪夜蛾卵寄生性天敵資源,明確其種類(lèi)和鑒別特征,對(duì)篩選優(yōu)勢(shì)天敵種類(lèi)和開(kāi)展生物防治具有重要意義。對(duì)福建省寄生性天敵資源調(diào)查結(jié)果表明,福建省有兩種草地貪夜蛾卵寄生蜂,分別為夜蛾黑卵蜂Telenomus remus Nixon和螟黃赤眼蜂 Trichogramma chilonis Ishii,本文記述了這兩種卵寄生蜂的主要形態(tài)特征,并觀(guān)察了其寄生行為。
關(guān)鍵詞 草地貪夜蛾; 寄生蜂; 調(diào)查; 鑒別; 寄生行為
中圖分類(lèi)號(hào): S 435.132 ?文獻(xiàn)標(biāo)識(shí)碼: A ?DOI: 10.16688/j.zwbh.2019614
Abstract The fall armyworm, Spodoptera frugiperda, is one of the most important agricultural pests in the world. It has strong immigrating ability and causes harm to corn and Gramineae plants. Therefore, it is of great importance to further surveys and identification on parasitoid wasps of S. frugiperda egg for selection of superior natural enemies and field application. Through field surveys, two species of egg parasitoid wasps, Telenomus remus Nixon and Trichogramma chilonis Ishii were collected in Fujian province. The morphological characteristics and occurrence of parasitoid wasps were briefly recorded with the photographs of parasitoid wasps, and the parasitic behavior was also studied.
Key words Spodoptera frugiperda; parasitoids; investigation; identification; parasitic behavior
草地貪夜蛾Spodoptera frugiperda (J.E.Smith)隸屬鱗翅目Lepidoptera,夜蛾科Noctuidae,又稱(chēng)秋黏蟲(chóng)(英文名fall armyworm),原產(chǎn)于美洲熱帶及亞熱帶地區(qū),具有食性雜、繁殖能力強(qiáng)、遷飛擴(kuò)散快、為害嚴(yán)重等特點(diǎn)[1-4]。2019年1月,草地貪夜蛾入侵我國(guó)云南省,僅歷時(shí)9個(gè)月就已入侵我國(guó)25個(gè)省份,見(jiàn)蟲(chóng)面積100多萬(wàn)hm2,實(shí)際為害面積16.4萬(wàn) hm2[5]。草地貪夜蛾將在我國(guó)西南、華南地區(qū)越冬定殖,成為我國(guó)又一個(gè)“北遷南回、周年循環(huán)”的重大遷飛性害蟲(chóng),其發(fā)生和為害可能成為常態(tài)[5]。因此,加強(qiáng)草地貪夜蛾的監(jiān)測(cè)與防控研究刻不容緩。
生物防治是害蟲(chóng)防治持續(xù)有效的方法。國(guó)外對(duì)草地貪夜蛾的生物防治研究主要集中于寄生性天敵,包括膜翅目和雙翅目昆蟲(chóng)[6],其中,緣腹細(xì)蜂科Scelionidae的夜蛾黑卵蜂Telenomus remus Nixon是美洲、非洲、亞洲等地草地貪夜蛾重要的卵寄生蜂[7-10];繭蜂科Braconidae脊繭蜂屬的Aleiodes laphygmae (Viereck)、懸繭蜂屬的Meteorus laphygmae (Viereck)、內(nèi)繭蜂屬的Rogas vaughani (Muesebeck)和R. laphygmae (Viereck)、雕絨繭蜂屬的Glyptapanteles creatonoti (Viereck)是幼蟲(chóng)期主要寄生蜂[10-13],甲腹繭蜂屬寄生蜂Chelonus spp.是“卵-幼蟲(chóng)”兼性寄生蜂[14-15];姬蜂科Ichneumonidae齒唇姬蜂屬的Campoletis grioti (Blanchard)、黑唇姬蜂C.sonorensis (Cameron)和棉鈴蟲(chóng)齒唇姬蜂C.chlorideae Uchida是幼蟲(chóng)期主要寄生蜂[10-12];姬蜂科的Diapetimorpha introita (Cresson)是蛹期主要寄生蜂[12]。此外,赤眼蜂科Trichogrammatidae的赤眼蜂屬Trichogramma spp.也是卵期寄生蜂[16-17]。這些寄生蜂在生物防治中發(fā)揮了重要作用,尤其是卵寄生蜂寄生率高,田間適應(yīng)性強(qiáng),被多個(gè)國(guó)家成功應(yīng)用于草地貪夜蛾的生物防治[6,18-21]。
2019年5月,在福建省泉州市、南安市首先發(fā)現(xiàn)草地貪夜蛾入侵。之后,全省各地陸續(xù)發(fā)現(xiàn)草地貪夜蛾為害[22]。我們?cè)诟=ǜ鞯剡M(jìn)行了草地貪夜蛾寄生性天敵的調(diào)查,共采集到兩種卵寄生蜂,分別為夜蛾黑卵蜂Telenomus remus Nixon和螟黃赤眼蜂Trichogramma chilonis Ishii。由于草地貪夜蛾是今年重大入侵害蟲(chóng),及時(shí)進(jìn)行監(jiān)測(cè)和綠色防控勢(shì)在必行。深入調(diào)查發(fā)掘、準(zhǔn)確鑒定優(yōu)勢(shì)種天敵至關(guān)重要。本文在對(duì)福建省草地貪夜蛾寄生性天敵資源調(diào)查的基礎(chǔ)上,重點(diǎn)研究了兩種卵寄生蜂,夜蛾黑卵蜂和螟黃赤眼蜂的形態(tài)特征,提供了寄生蜂的形態(tài)特征照片;概述了目前草地貪夜蛾卵寄生蜂的種類(lèi);初步研究了兩種卵寄生蜂的寄生行為,為進(jìn)一步利用寄生性天敵開(kāi)展草地貪夜蛾生物防治提供科學(xué)依據(jù)。
1 材料與方法
1.1 寄生性天敵調(diào)查
2019年8月-2019年10月在福建省多地采集草地貪夜蛾卵塊,帶回實(shí)驗(yàn)室飼養(yǎng)收集寄生蜂。先將羽化的寄生蜂進(jìn)行拍照,然后連同采集標(biāo)簽放入100%乙醇中保存,待制作玻片標(biāo)本和種類(lèi)鑒定。
1.2 兩種卵寄生蜂的主要形態(tài)特征和寄生行為
1.2.1 玻片標(biāo)本制作
根據(jù)黃建[23]的方法進(jìn)行玻片標(biāo)本制作。
1.2.2 標(biāo)本拍照
寄生蜂和寄主照片采用Nikon SMZ18體視鏡(帶Nikon DS-Ri2攝像頭、NIS-Elements D軟件)拍攝。玻片標(biāo)本照片采用Nikon Ni微分干涉顯微鏡(帶Nikon DS-Ri2攝像頭、NIS-Elements D軟件)拍攝。
1.2.3 種類(lèi)鑒定
寄生蜂體長(zhǎng)在未制作玻片標(biāo)本前測(cè)量,其他形態(tài)特征則在玻片標(biāo)本上進(jìn)行測(cè)量。
1.2.4 夜蛾黑卵蜂和螟黃赤眼蜂的產(chǎn)卵行為觀(guān)察
分別以草地貪夜蛾和斜紋夜蛾卵為寄主,體視鏡下觀(guān)察比較夜蛾黑卵蜂和螟黃赤眼蜂的產(chǎn)卵行為。室溫條件下進(jìn)行。
1.2.5 數(shù)據(jù)分析
利用SPSS 17.0 對(duì)數(shù)據(jù)進(jìn)行比較分析。
2 結(jié)果與分析
共采集到草地貪夜蛾卵寄生蜂兩種,分別為夜蛾黑卵蜂T. remus Nixon和螟黃赤眼蜂T. chilonis Ishii,對(duì)兩種寄生蜂的主要鑒別特征記述如下。
2.1 夜蛾黑卵蜂Telenomus remus Nixon, 1937(圖1~圖5) ?Telenomus remus Nixon, 1937. Annals and Magazine of Natural History, 20: 444-475.
雌:體長(zhǎng)0.5~0.6 mm,體亮黑色。觸角暗褐色,足基節(jié)、腿節(jié)和脛節(jié)大部分暗褐色,轉(zhuǎn)節(jié)、脛節(jié)基部小部分、跗節(jié)第1節(jié)或第1~4節(jié)褐黃色至稍暗色,跗節(jié)端部暗色。翅透明,前翅亞緣脈約2/3處下方具一不規(guī)則的淺煙褐色豎條紋,緣脈下方、痣脈內(nèi)側(cè)具一淺煙褐色云斑。
復(fù)眼具細(xì)毛。頭橫寬略大于胸寬,頭頂散生細(xì)毛。觸角11節(jié),各節(jié)具較密的短毛。柄節(jié)長(zhǎng)約為寬的5.52倍;梗節(jié)長(zhǎng)于鞭節(jié)各節(jié),約與棒節(jié)末節(jié)等長(zhǎng);索節(jié)5節(jié),小,念珠狀;棒節(jié)膨大,4節(jié),各節(jié)長(zhǎng)度比為2.3∶3.3∶3.4∶5.0。
胸部隆起,胸部背板密布細(xì)毛。中胸盾片兩側(cè)緣各具1個(gè)近三角形側(cè)突;小盾片前緣兩側(cè)各具6~7個(gè)小齒,后緣及側(cè)緣具脊,形成弧形念珠狀;后胸背板中部具網(wǎng)狀脊;并胸腹節(jié)兩側(cè)、氣門(mén)下方具梯形或不規(guī)則形的塊狀脊,整體呈拱狀。
前翅窄長(zhǎng),長(zhǎng)為寬的3.20倍;緣毛為翅寬的0.42倍。亞緣脈長(zhǎng),具8根剛毛;緣脈短,約為亞緣脈長(zhǎng)的0.16倍,約為痣脈長(zhǎng)的0.57倍,具2~3根剛毛;后緣脈不發(fā)達(dá)。后翅細(xì)長(zhǎng),前后緣近平行,緣脈長(zhǎng),約為翅寬的1.54倍。
足跗節(jié)5-5-5。
腹部長(zhǎng)梭形,稍長(zhǎng)于胸部。第1、2節(jié)背板基部具縱脊溝,其余各節(jié)光滑;第2背板最長(zhǎng),為其后各節(jié)背板總和長(zhǎng)的2.04倍。末節(jié)腹節(jié)的腹板不縱裂,產(chǎn)卵器從腹部末端伸出,側(cè)面觀(guān)與腹部縱向平行,通常產(chǎn)完卵后產(chǎn)卵器會(huì)縮回腹部?jī)?nèi),再次產(chǎn)卵時(shí)又伸出。
雄:體色、形態(tài)結(jié)構(gòu)、翅等十分近似雌性。但觸角12節(jié),且棒節(jié)不明顯,整個(gè)鞭節(jié)呈線(xiàn)形念珠狀(雌性觸角11節(jié),棒節(jié)膨大,4節(jié));梗節(jié)長(zhǎng)于鞭節(jié)各節(jié),鞭節(jié)中末節(jié)相對(duì)最長(zhǎng)且寬,觸角各節(jié)具較密的短毛。足腿節(jié)和脛節(jié)相對(duì)淺褐色。雄性外生殖器從腹部末端朝腹向伸出,側(cè)面觀(guān)與腹部縱向呈一定角度(雌性產(chǎn)卵器從腹部末端伸出,側(cè)面觀(guān)與腹部縱向平行)。
2.2 螟黃赤眼蜂Trichogramma chilonis Ishii,1941(圖6~圖8) ?Trichogramma chilonis Ishii, 1941. Knotyu, 14: 169-176.
雄:體長(zhǎng)0.35~0.40 mm。體暗黃色,中胸盾暗褐色,腹部黑褐色。翅透明,前翅基部到痣脈下方翅面大部分淺煙褐色,翅脈暗褐色。雄性外生殖器鉤爪黑褐色。
觸角5節(jié);柄節(jié)長(zhǎng)為寬的4.25倍;梗節(jié)長(zhǎng)為寬的1.55倍;環(huán)節(jié)2節(jié),?。ǖ?環(huán)節(jié)通常不易看到);棒節(jié)1節(jié)(索節(jié)與棒節(jié)愈合),明顯長(zhǎng)于柄節(jié)與梗節(jié)之和,長(zhǎng)為寬的6.31倍,具長(zhǎng)毛,最長(zhǎng)的毛為棒節(jié)寬的2.68倍。前翅闊圓,長(zhǎng)為寬的1.86倍;緣毛為翅寬的0.14倍。翅脈呈“S”形彎曲,緣脈短,具約3根剛毛,亞緣脈長(zhǎng),痣脈約與緣脈等長(zhǎng),端部略膨大,無(wú)后緣脈。翅面纖毛分布成列。
足跗節(jié)3-3-3。
外生殖器:陽(yáng)基背突三角形,端部較鈍圓,具明顯的半圓形側(cè)葉,陽(yáng)基背突末端達(dá)D(腹中突基部至陽(yáng)基側(cè)瓣末端距離)的約1/2;腹中突較大,約為D的0.48倍;中脊略長(zhǎng)于D,成對(duì);鉤爪末端伸達(dá)D的1/2左右。陽(yáng)莖與其內(nèi)突約等長(zhǎng),兩者全長(zhǎng)約等于陽(yáng)基長(zhǎng)度。
雌:體長(zhǎng)0.34~0.47 mm。體褐黃色,腹部暗黃色,約第2~3節(jié)具1暗褐色橫帶。翅透明,前翅基部到痣脈下方翅面大部分淺煙褐色,翅脈暗褐色。產(chǎn)卵器基部外側(cè)各具1個(gè)小暗褐色斑。
觸角7節(jié);柄節(jié)長(zhǎng)為寬的3.76倍,梗節(jié)長(zhǎng)為寬的1.83倍,長(zhǎng)于2節(jié)索節(jié)之和;環(huán)節(jié)2節(jié),?。ǖ?環(huán)節(jié)通常不易看到);索節(jié)2節(jié),第1索節(jié)稍短于第2索節(jié);棒節(jié)1節(jié),粗長(zhǎng),長(zhǎng)于梗節(jié)、環(huán)節(jié)和索節(jié)之和,從基向2/5到末端的腹面強(qiáng)烈斜截,具多個(gè)長(zhǎng)條形感覺(jué)器。前翅闊圓,長(zhǎng)為寬的1.98倍,其他特征基本類(lèi)似雄性。
足跗節(jié)3-3-3。
產(chǎn)卵器第3產(chǎn)卵瓣短,約為第2負(fù)瓣片長(zhǎng)的0.17倍。
從田間采集的草地貪夜蛾卵中飼養(yǎng)出來(lái)的螟黃赤眼蜂,有些個(gè)體發(fā)育不良,多為翅縮短變?。▓D7c)。同時(shí),據(jù)林乃銓記述,在不同溫度條件下培養(yǎng)出來(lái)的螟黃赤眼蜂雌成蟲(chóng)體色有差異[24]。
2.3 草地貪夜蛾卵、卵-幼蟲(chóng)寄生蜂種類(lèi)
據(jù)國(guó)內(nèi)外文獻(xiàn)報(bào)道,草地貪夜蛾的卵寄生蜂有緣腹細(xì)蜂科Scelionidae的1種,赤眼蜂科Trichogrammatidae的7種;卵、卵-幼蟲(chóng)寄生蜂有繭蜂科Braconidae的4種(表1)。卵-幼蟲(chóng)寄生蜂為卵-幼蟲(chóng)跨期寄生,寄生蜂產(chǎn)卵在寄主卵中,寄主卵孵化為幼蟲(chóng)后,寄生蜂卵才孵化,在寄主幼蟲(chóng)體內(nèi)完成寄生蜂幼蟲(chóng)發(fā)育。
2.4 夜蛾黑卵蜂和螟黃赤眼蜂的產(chǎn)卵行為觀(guān)察
夜蛾黑卵蜂和螟黃赤眼蜂的寄生行為都可以分為搜尋、檢測(cè)、產(chǎn)卵、清理等幾個(gè)過(guò)程。起初均是以觸角敲擊搜尋寄主,發(fā)現(xiàn)寄主后,用觸角敲擊寄主卵表面進(jìn)行檢測(cè),此時(shí)往往會(huì)圍繞卵表面轉(zhuǎn)圈試探,夜蛾黑卵蜂檢測(cè)寄主圈數(shù)往往超過(guò)一圈,而螟黃赤眼蜂檢測(cè)時(shí)間較短,繞卵表面爬行不到一圈即可確定是否產(chǎn)卵。確認(rèn)好寄主后,兩種蜂都會(huì)掉轉(zhuǎn)身,伸出產(chǎn)卵針插入寄主卵中,后足支撐身體,將卵產(chǎn)入寄主體內(nèi)。螟黃赤眼蜂產(chǎn)卵時(shí)腹部末端有規(guī)律地伸縮,產(chǎn)卵時(shí)有時(shí)將產(chǎn)卵器拔出一部分后再以不同角度插回寄主卵中,可在相同或不同寄主卵塊上多次產(chǎn)卵,并且產(chǎn)卵時(shí)間較檢測(cè)時(shí)間長(zhǎng)。產(chǎn)卵結(jié)束后,拔出產(chǎn)卵針,清理。分別以草地貪夜蛾和斜紋夜蛾卵為寄主,比較了夜蛾黑卵蜂和螟黃赤眼蜂的寄生行為,對(duì)檢測(cè)時(shí)間、檢測(cè)圈數(shù)、產(chǎn)卵時(shí)間等[40]進(jìn)行觀(guān)察記錄,發(fā)現(xiàn)這兩種蜂的檢測(cè)時(shí)間、檢測(cè)寄主圈數(shù)和產(chǎn)卵時(shí)間并無(wú)顯著差異(表2)。
3 討論
卵寄生蜂是草地貪夜蛾寄生性天敵中重要的寄生蜂類(lèi)群,主要有夜蛾黑卵蜂和赤眼蜂,還有繭蜂科的一些“卵-幼蟲(chóng)”跨期寄生蜂。
夜蛾黑卵蜂是草地貪夜蛾重要的卵寄生蜂之一, 寄生多種鱗翅目害蟲(chóng),尤其是夜蛾科害蟲(chóng)的卵[41],能將害蟲(chóng)消滅在卵期,從而降低幼蟲(chóng)對(duì)作物的為害[25-29]。1937年,Nixon首次發(fā)現(xiàn)并描述了該蜂[42]。夜蛾黑卵蜂可利用草地貪夜蛾或其他夜蛾科寄主卵大量繁殖后進(jìn)行田間釋放應(yīng)用[43],是一種非常有潛力的寄生蜂。目前,利用夜蛾黑卵蜂防治草地貪夜蛾的技術(shù)日趨成熟,美國(guó)、巴西、墨西哥、委內(nèi)瑞拉等國(guó)家均取得了顯著的防治效果[7-10,19,21,43]。自2019年草地貪夜蛾入侵我國(guó)以來(lái),已報(bào)道在廣東、香港、貴州等地從草地貪夜蛾卵中調(diào)查采集到夜蛾黑卵蜂[33,44-45]。本研究在福建各地調(diào)查也發(fā)現(xiàn)寄生草地貪夜蛾的夜蛾黑卵蜂,且可以寄生草地貪夜蛾整個(gè)卵塊,寄生蜂種群數(shù)量大,是控制草地貪夜蛾很好的卵寄生蜂資源。
據(jù)報(bào)道,寄生草地貪夜蛾卵的赤眼蜂有7種(表1),均屬于赤眼蜂屬Trichogramma,其中T. pretiosum (Riley)是草地貪夜蛾防治應(yīng)用中研究較多的一種赤眼蜂[16,26,28,32,35,37]。夜蛾黑卵蜂可寄生整個(gè)寄主卵塊,但赤眼蜂僅能寄生寄主卵塊的上部卵[26]。目前,我國(guó)廣東[33]、香港[33]等地已從草地貪夜蛾卵中調(diào)查采集到螟黃赤眼蜂。本研究調(diào)查發(fā)現(xiàn),從田間草地貪夜蛾卵中采集到的螟黃赤眼蜂種群數(shù)量明顯少于夜蛾黑卵蜂。因此,這兩種卵寄生蜂在田間的種群競(jìng)爭(zhēng)情況尚需進(jìn)一步研究。
“卵-幼蟲(chóng)”寄生蜂產(chǎn)卵在寄主卵中,因此有人也將它列入卵寄生蜂類(lèi)群中。但這類(lèi)寄生蜂的卵在寄主卵孵化為幼蟲(chóng)后才開(kāi)始孵化,并隨著寄主幼蟲(chóng)的發(fā)育一起發(fā)育,而甲腹繭蜂(繭蜂科Braconidae,甲腹繭蜂亞科Cheloninae)的卵產(chǎn)入寄主的卵中,差不多到寄主幼蟲(chóng)要化蛹時(shí)才開(kāi)始它們的發(fā)育[46]。相比卵寄生蜂,“卵-幼蟲(chóng)”寄生蜂寄生后,寄主幼蟲(chóng)仍可以繼續(xù)造成危害,是該類(lèi)寄生蜂不足之處。甲腹繭蜂屬的Chelonus cautus和C.insularis曾被報(bào)道是草地貪夜蛾的“卵-幼蟲(chóng)”寄生蜂[14-15,38-39],而C. antillarum和C.formosanus也曾被報(bào)道是草地貪夜蛾的卵寄生蜂[34],根據(jù)甲腹繭蜂的寄生習(xí)性[46],后兩種甲腹繭蜂可能也是“卵-幼蟲(chóng)”寄生蜂。
本文在調(diào)查與鑒別草地貪夜蛾兩種卵寄生蜂的基礎(chǔ)上對(duì)其寄生行為進(jìn)行了初步研究,其他生物學(xué)特性及防治應(yīng)用尚在進(jìn)一步研究中。
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