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14種殺蟲劑對雙條拂粉蚧的生物活性測定

2025-02-09 00:00:00王雨天馮琰梁泳琪曹先梅李濤王洪星
熱帶作物學報 2025年2期

摘""要:本研究旨在篩選出對雙條拂粉蚧(Ferrisia"virgata)毒殺效果較好的殺蟲劑,為雙條拂粉蚧的科學防治提供依據。采用噴霧法在室內測定14種殺蟲劑在6、12、24、48"h對雙條拂粉蚧的毒殺效果,對效果較好的7種殺蟲劑測定處理24、48"h對雙條拂粉蚧3齡若蟲的致死中濃度(median"lethal"concentration,"LC50);基于各殺蟲劑的推薦使用劑量,采用人工噴霧法于2024年5月在海南省三亞市崖州區檳榔園對啶蟲脒、氟啶蟲胺腈、甲氰菊酯、二嗪磷、噻蟲嗪、丙·虱螨脲、氟啶蟲酰胺·聯苯菊酯進行雙條拂粉蚧田間防效評價。初步篩選結果顯示,啶蟲脒、氟啶蟲胺腈、甲氰菊酯、二嗪磷、噻蟲嗪、丙·虱螨脲、氟啶蟲酰胺·聯苯菊酯對雙條拂粉蚧3齡若蟲的毒殺效果較好,藥后48"h的死亡率均在70%以上。室內毒力測定結果顯示,處理后24、48"h,7種藥劑的相對毒力由大到小依次為噻蟲嗪、甲氰菊酯、氟啶蟲胺腈、啶蟲脒、二嗪磷、氟啶蟲酰胺·聯苯菊酯、丙·虱螨脲。田間藥效試驗結果顯示,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈和啶蟲脒的田間防效較好,藥后1~7"d的校正防效達60%以上,二嗪磷、氟啶蟲酰胺·聯苯菊酯、丙·虱螨脲藥后7"d的校正防效低于60%,噻蟲嗪對雙條拂粉蚧的田間防效最佳,施藥1"d后校正防效為90.13%,施藥3"d后校正防效達到峰值94.53%,施藥7"d后校正防效降至87.20%,顯著高于其他殺蟲劑。研究結果表明,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈對雙條拂粉蚧兼具較好的室內殺蟲活性與田間防效。本研究結果為選擇合適的藥劑防治雙條拂粉蚧提供科學依據,也為檳榔黃化病的防控提供技術支撐。

關鍵詞:雙條拂粉蚧;殺蟲劑;室內毒力;田間藥效;檳榔黃化病中圖分類號:S763.7""""""文獻標志碼:A

Evaluation"of"the"Bioactivity"of"14"Insecticides"against"Ferrisia"virgata

WANG"Yutian1,2,"FENG"Yan1,"LIANG"Yongqi1,"CAO"Xianmei2,"LI"Tao3,"WANG"Hongxing2*

1."School"of"Tropical"Agriculture"and"Forestry,"Hainan"University,"Danzhou,"Hainan"571737,"China;"2."School"of"Breeding"and"Multiplication"(Sanya"Institute"of"Breeding"and"Multiplication),"Hainan"University,"Sanya,"Hainan"572025,"China;"3."Hainan"Plant"Protection"Station,"Haikou,"Hainan"571199,"China

Abstract:"The"aim"of"this"study"was"to"screen"out"insecticides"that"exhibit"higher"toxicity"to"Ferrisia"virgata,"thereby"establishing"a"scientific"foundation"for"controlling"F."virgata."The"toxicity"of"14"insecticides"on"F."virgata"was"assessed"indoors"at"6"h,"12"h,"24"h"and"48"h"after"application"by"a"spraying"method,"among"which"the"median"lethal"concentration"(LC50)"values"of"the"7"insecticides"showing"greater"efficacy"against"the"3rd"nymph"F."virgata"were"determined"specifically"at"24"h"and"48"h"post-application."Based"on"the"recommended"dosage"of"each"insecticide,"the"field"control"efficacy"of"acetamiprid,"sulfoxaflor,"fenpropathrin,"diazinon,"thiamethoxam,"profenofos·lufenuron,"flonicamid·bifenthrin"against"F."virgata"was"evaluated"by"artificial"spraying"in"the"areca"field"of"Yazhou,"Sanya,"Hainan"in"May"2024."Thenbsp;preliminary"screening"results"showed"that"acetamiprid,"sulfoxaflor,"fenpropathrin,"diazinon,"thiamethoxam,"profenofos·lufenuron,"flonicamid·bifenthrin"had"good"toxicity"against"the"3rd"nymph"F."virgata,"with"the"mortality"rate"of"more"than"70%"at"48"h"after"treatment."The"results"of"laboratory"toxicity"determination"showed"that"24"h"and"48"h"after"treatment,"the"relative"virulence"of"the"seven"agents"ranked"from"highest"to"lowest"as"follows:"Thiamethoxam,"fenpropathrin,"sulfoxaflor,"acetamiprid,"diazinon,"flonicamid·bifenthrin,"profenofos·lufenuron."The"results"of"field"efficacy"test"showed"that"thiamethoxam,"fenpropathrin,"sulfoxaflor"and"acetamiprid"exhibited"the"superior"field"control"effect,"and"the"corrected"control"effect"was"more"than"60%"during"1-7"days"after"treatment,"while"that"of"diazinon,"flonicamid·bifenthrin,"profenofos."lufenuron"was"less"than"60%"on"7"days"after"treatment."Thiamethoxam"had"the"highest"field"control"effect"on"mealybug"bistripe,"achieving"a"corrected"control"effect"of"90.13%"after"1"day"of"application,"peaking"at"94.53%"after"3"days,"and"maintaining"a"substantial"efficacy"of"87.20%"after"7"days,"which"was"significantly"higher"than"that"of"the"other"insecticides."The"results"of"this"study"demonstrated"that"thiamethoxam,"fenpropathrin,"sulfoxaflor"had"good"laboratory"insecticidal"activity"and"field"control"efficacy"against"F."virgata."The"findings"would"provide"a"scientific"basis"for"selecting"suitable"pesticides"for"controlling"F."virgata,"and"also"offer"technical"support"for"the"prevention"and"control"strategy"of"areca"palm"yellow"leaf"disease.

Keywords:"Ferrisia"virgata;"insecticides;"laboratory"toxicity;"field"control"efficacy;"areca"palm"yellow"leaf"disease

DOI:"10.3969/j.issn.1000-2561.2025.02.013

檳榔(Areca"catechu"L.)是東南亞地區最具經濟意義的熱帶作物之一,因其作為嗜好品而廣受歡迎,在中國和印度商業價值最高。2020年,我國海南省檳榔果的總產值達到146.8億元(約20億美元),為220萬農民提供了重要的收入來源[1-2]。檳榔黃化病(yellow"leaf"disease,"YLD)是一類危害檳榔的毀滅性病害,對檳榔產業造成重大的經濟損失[3-4]。2020年本團隊通過關聯性分析發現檳榔黃化相關病毒(Areca"palm"velari virus"1,"APV1)與海南檳榔黃化病高度相關[3,"5]。蟲媒接種試驗證明檳榔園中天然分布的雙條拂粉蚧(Ferrisia"virgata)和柑桔棘粉蚧(Pseudococcus"cryptus)是APV1的傳播媒介,可從染病檳榔上100%獲毒并將APV1傳播至健康檳榔植株,隨接種時間的延長,檳榔APV1病毒含量越高,致使檳榔出現典型的葉肉黃化,葉脈保持綠色的黃化癥狀,且雙條拂粉蚧獲毒能力測定顯示最短獲毒時間為1"h[6-7]。

雙條拂粉蚧隸屬半翅目(Hemiptera)蚧總科(Coccoidea)粉蚧科(Pseudococcidae)拂粉蚧屬(Ferrisia),又稱絲粉蚧、條拂粉蚧、橘腺刺粉蚧、大長尾介殼蟲。該蟲普遍分布于非洲、東南亞、夏威夷等熱帶和亞熱帶區域,在我國長江流域以南部分地區也有分布[6,"8-9]。雙條拂粉蚧主要為害檳榔葉片,其中以下層4片老葉為主,少量為害樹干。成蟲和若蟲長期聚集于老葉背面,通過特有的刺吸式口器吸食組織汁液,被為害檳榔葉片出現黃色或黃褐色斑點,嚴重時葉片干枯壞死。此外,在聚集為害的葉背,雙條拂粉蚧可分泌大量蜜露,誘發煤煙病,破壞葉片光合作用。為害花序嚴重時花序干枯,造成落花落果[10-12]。雙條拂粉蚧是為害海南省檳榔的重要害蟲,其以半持久方式傳播APV1病毒,APV1病毒病傳染性強,危害嚴重,可造成檳榔產量顯著下降,甚至絕收[6]。

目前,針對APV1病毒引起的檳榔黃化病缺乏有效的防治手段和方法,而切斷傳播途徑是防治檳榔黃化病的關鍵手段[1,"13-14]。關于雙條拂粉蚧防治方面的研究尚無報道,為了篩選出能有效防治雙條拂粉蚧的藥劑,本研究利用噴霧法測定了14種藥劑對雙條拂粉蚧3齡若蟲的毒殺效果,通過室內毒力和田間防治效果驗證,篩選出對雙條拂粉蚧具有高效防治效果的藥劑,為防控檳榔黃化病提供科學依據。

1""材料與方法

1.1""材料

1.1.1""供試昆蟲""雙條拂粉蚧于2024年1月10日采自海南省三亞市崖州區檳榔園,在室內以南瓜為飼料進行脫毒,續代飼養,飼養條件:溫度為(28±1)℃,相對濕度為75%~80%,弱光條件的養蟲室內[6]。

1.1.2""供試藥劑""供試藥劑如表1所示。

1.2""方法

1.2.1""藥劑配制""每種藥劑根據有效成分含量用清水配制成濃度為1"mg/L的藥劑母液100"mL。后續初篩試驗和室內毒力測定試驗時再用清水稀釋成不同濃度。

1.2.2""生物測定方法""采用噴霧法[15-16]。供試藥劑用清水稀釋成不同濃度梯度的藥劑溶液,用毛筆挑取雙條拂粉蚧3齡若蟲至鋪有濾紙的培養皿(直徑9"cm)內,每皿放置20頭。使用盛有藥液的噴瓶對準培養皿連續噴4~6次,使培養皿和蟲體充分接觸藥液,用吸水紙吸取多余藥液,蓋好培養皿蓋子。藥劑初篩試驗設置14個處理,每處理3次重復,以清水為對照[17]。藥劑毒力測定試驗設置35個處理,每處理3次重復,以清水為對照。置于溫度為(28±1)℃、相對濕度為(65±10)%、光暗比(L∶D)為14"h∶10"h的人工氣候箱中飼養觀察[18]。藥劑初篩試驗6、12、24、48"h后檢查存活蟲數和死亡蟲數,藥劑毒力測定試驗24、48"h后檢查存活蟲數和死亡蟲數。用毛筆輕碰后蟲體不動、足不能動的視為死亡。每個處理4次重復。

1.2.3""7種藥劑對雙條拂粉蚧的田間防效測定""根據1.2.2的試驗結果選擇藥效較好的7種藥劑,然后配制成廠家推薦使用的最低濃度,以清水作為空白對照進行田間試驗。在三亞崖州區檳榔園中進行田間防效試驗,以噴霧施藥。蟲口基數調查以檳榔植株為單位,每5株為1個小區,每小區作為1個處理,隨機抽取2株檳榔(標記)進行調查,3次重復,取平均數作為蟲口基數。用小型噴霧器對所調查小區的檳榔均勻噴霧,并于施藥后1、3、7"d分別調查標記檳榔植株上殘存的雙條拂粉蚧活蟲數量。

1.3""數據處理

采用Excel"2019軟件進行試驗數據的統計與分析,采用SPSS"22.0軟件計算藥劑的毒力回歸方程、致死中濃度(LC50)、95%置信區間,以及分析相同藥劑不同時間或不同濃度處理后雙條拂粉蚧死亡率的差異顯著性。相對毒力指數=供試藥劑中最大LC50值/供試藥劑LC50值[18-19],其他指標分別按下列公式計算:

2""結果與分析

2.1""14種藥劑處理后雙條拂粉蚧3齡若蟲的死亡率

根據預試驗,使用不同藥劑0.01"mg/L濃度處理后雙條拂粉蚧3齡若蟲的校正死亡率見表2。三氟苯嘧啶、啶蟲脒、氟啶蟲胺腈、稻豐散、二嗪磷、甲氰菊酯、噻嗪酮、噻蟲嗪、螺蟲乙酯、氟啶蟲酰胺·聯苯菊酯及礦物油11種藥劑在0.01"mg/L的濃度下,24"h內雙條拂粉蚧的校正死亡率存在明顯變化,并隨處理時間的延長,其校正死亡率逐漸增大。噴施啶蟲脒、氟啶蟲胺腈、甲氰菊酯、二嗪磷、噻蟲嗪、丙·虱螨脲、氟啶蟲酰胺·聯苯菊酯后48"h,雙條拂粉蚧的校正死亡率均在70%以上;噴施三氟苯嘧啶、稻豐散、噻嗪酮、螺蟲乙酯后48"h,雙條拂粉蚧的校正死亡率均在20%~50%之間;噴施吡丙醚、喹硫磷、礦物油后48"h,雙條拂粉蚧的校正死亡率均在20%以下。結果表明,啶蟲脒、氟啶蟲胺腈、甲氰菊酯、二嗪磷、噻蟲嗪、丙·虱螨脲、氟啶蟲酰胺·聯苯菊酯7種藥劑對雙條拂粉蚧的毒殺效果最好,而吡丙醚、喹硫磷、礦物油的毒殺效果最差。

2.2""7種藥劑的室內毒力測定

2.2.1""不同藥劑處理后雙條拂粉蚧3齡若蟲的死亡率""根據2.1的藥劑篩選試驗,選出殺蟲效果較好的7種藥劑進行室內毒力測定。由表3可知,藥后24、48"h,相同藥劑不同濃度時,隨藥劑濃度的升高,雙條拂粉蚧的校正死亡率逐漸增大,最高濃度和最低濃度的校正死亡率達顯著性差異;同一藥劑隨處理時間的延長,其校正死亡率逐漸增大。噻蟲嗪對雙條拂粉蚧3齡若蟲的毒殺效果最好,在濃度0.000"040"mg/L時,藥后48"h的校正死亡率在50.00%以上。丙·虱螨脲對雙條拂粉蚧3齡若蟲的毒殺作用最差,藥后48"h,最高劑量0.015"mg/L的校正死亡率為86.67%。

2.2.2""不同藥劑處理后雙條拂粉蚧3齡若蟲的LC50值及相對毒力指數""7種不同藥劑處理后雙條拂粉蚧3齡若蟲的LC50值及相對毒力指數見表4。采用噴霧法測定結果顯示,丙·虱螨脲對雙條拂粉蚧3齡若蟲的LC50值最大,因此在計算相對毒力指數時以該藥劑的LC50值作為參照基礎,即為1。藥后24"h,7種藥劑的相對毒力由大到小依次為噻蟲嗪、甲氰菊酯、氟啶蟲胺腈、啶蟲脒、二嗪磷、氟啶蟲酰胺·聯苯菊酯、丙·虱螨脲;藥后48"h,7種藥劑相對毒力的大小順序未發生改變。藥后24、48"h,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈和啶蟲脒的相對毒力均排在前4位,藥后24"h,上述4種藥劑的LC50值分別為6.054×10–5、5.104×10–4、6.541×10–4、1.730×10–3"mg/L,藥后48"h的LC50值分別為2.982×10–5、1.672×10–4、2.245×10–4、5.030×10–4"mg/L。在施藥后24、48"h,噻蟲嗪的相對毒力指數分別為146.91和54.53,均排在第1位,表明噻蟲嗪對雙條拂粉蚧3齡若蟲的毒殺效果最好。

2.3""7種藥劑對雙條拂粉蚧的田間防效

對室內毒力表現較好的7種藥劑開展田間防效試驗,結果顯示,藥后1~7"d噻蟲嗪、甲氰菊酯、氟啶蟲胺腈和啶蟲脒的校正防效均達60%以上,其余3種藥劑藥后7"d的校正防效均低于60%(表5),表明噻蟲嗪、甲氰菊酯、氟啶蟲胺腈和啶蟲脒對雙條拂粉蚧田間種群防治效果較好。

3""討論

雙條拂粉蚧作為一種害蟲,不僅取食寄主葉片、分泌蜜露為害作物[9,"12,"20],還因其具有刺吸式口器,作為可可腫枝病毒(Cacao"swollen"shoot"virus,"CSSV)和胡椒黃斑駁病毒(Piper"yellow"mottle"virus,"PYMV)的傳播媒介[21-22],促進病毒的傳播,致使大量農作物感病死亡。在海南省,雙條拂粉蚧因傳播APV1病毒,使大批檳榔黃化,產量下降,受到人們的廣泛關注[6-7]。目前缺乏有效的措施防治檳榔黃化病,切斷APV1的傳播媒介是一個關鍵的手段。國內外對雙條拂粉蚧防治研究的相關報道較少,借鑒經驗也較少。其他粉蚧類害蟲的化學防治研究表明,高效氯氟氰菊酯、丙溴磷、毒死蜱和阿維菌素對棉花粉蚧具有較好的毒殺效果[18];烯啶蟲胺對新菠蘿灰粉蚧的觸殺毒力最好,可作為防治新菠蘿灰粉蚧的備選藥劑[16];王偉蘭等[23]研究認為丙溴磷、吡蟲啉、毒死蜱等化學殺蟲劑對扶桑綿粉蚧的直接毒殺效果顯著;程東美等[24]研究表明滅多威、敵敵畏、毒死蜱、啶蟲脒等農藥對埃及吹綿蚧3齡若蟲均有較好的室內和田間毒殺作用。由此可見,不同粉蚧對不同藥劑的敏感度存在差異,使用具有針對性的化學藥劑可以提高防治效果。為此,本團隊開展市面上常規的14種藥劑對雙條拂粉蚧的毒殺效果研究,結果表明,14種藥劑經過預試驗確定使用濃度為0.01"mg/L,在保持其他相同條件的情況下,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈、啶蟲脒、二嗪磷、氟啶蟲酰胺·聯苯菊酯、丙·虱螨脲7種藥劑對雙條拂粉蚧3齡若蟲的藥效較好,進一步測定上述7種藥劑對雙條拂粉蚧3齡若蟲的毒力及其田間防治效果。毒力測定表明,這7種藥劑均對雙條拂粉蚧3齡若蟲有較好的觸殺作用,無論是藥后24"h還是48"h,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈的相對毒力均排在前3位且噻蟲嗪的效果最好,這3種藥劑在田間試驗中,藥后1~7"d的校正防效達70%以上,其中噻蟲嗪的防治效果達到85%,與其他藥劑相比,噻蟲嗪能夠有效防治雙條拂粉蚧3齡若蟲。

噻蟲嗪是一種第2代煙堿類高效低毒殺蟲劑,殺蟲譜廣,對作物、環境安全且具有很強的葉片傳導活性和根部內吸性,藥劑能快速、充分被吸收,在植株體內滯留時間長,降解緩慢,同時其降解產物噻蟲胺殺蟲活性更高,持效期更長[16]。甲氰菊酯對害蟲的擊倒速度快,具有高效、廣譜、低殘留、持效期長的特點,在農業生產中被廣泛應用[25-26]。氟啶蟲胺腈作用于昆蟲的神經系統,殺蟲譜廣,可通過葉、莖、根吸收進入植物體內,對害蟲具有觸殺和胃毒作用,藥效快、持效期長[27]。白學慧等[12]研究表明,1000倍高效氯氟氰菊酯對雙條拂粉蚧具有較好的毒殺效果,在發生蟲害的咖啡園中每隔10"d噴施1次,噴施3次,經1"a監測未發現該蟲再次發生。由此,也可以使用氯氟氰菊酯噴施檳榔,比較該藥劑與本研究供試藥劑的防治效果是否存在差異。因檳榔葉片蠟質層厚實,在噴施噻蟲嗪、甲氰菊酯、氟啶蟲胺腈時可輔以滲透劑,以便更好地發揮藥效。綜上所述,噻蟲嗪、甲氰菊酯、氟啶蟲胺腈在雙條拂粉蚧的綜合防治中具有重要的應用價值。

雙條拂粉蚧繁殖力強,世代重疊嚴重,有群集習性,且善于隱藏,主要聚集在檳榔葉片背部、葉鞘等部位,隱藏檳榔葉片的裂縫和翹皮下[8,"28],使雙條拂粉蚧的全面防治具有較大困難。在田間防治期間,可將本研究毒殺效果較好的噻蟲嗪與其他內吸性藥劑混合噴施,間隔15"d噴施1次,連續噴施3次,可達到較好的防治效果。不同齡期粉蚧對藥劑的敏感性存在差異,印楝油對扶桑綿粉蚧的直接毒殺作用較弱,藥后3"d對1齡若蟲的致死率僅為66.43%,對其他蟲齡幾乎無直接毒殺作用,不同蟲期中低齡若蟲對藥劑更敏感[23,"29];不同齡期新菠蘿灰粉蚧對5種殺蟲劑的敏感順序為:1齡gt;2齡gt;3齡gt;雌成蟲[16]。因此,使用適當的藥劑消滅媒介昆蟲,可以有效切斷病害的傳播途徑,減少病源的擴散,降低檳榔黃化病的發生率,有助于種植戶及時發現并處理蟲害,減少病害對檳榔產量和品質的影響,促進檳榔產業的健康發展。

本研究從14種藥劑里篩選出對雙條拂粉蚧毒殺效果較好的3種藥劑為噻蟲嗪、甲氰菊酯、氟啶蟲胺腈,但是本研究僅對雙條拂粉蚧3齡若蟲進行試驗驗證,后期有必要針對雙條拂粉蚧蟲卵及不同齡期進行藥劑篩選,以期為檳榔黃化病的綜合防治提供更科學、準確的理論依據。

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