14种杀虫剂对双条拂粉蚧的生物活性测定
2025-02-09王雨天冯琰梁泳琪曹先梅李涛王洪星
摘""要:本研究旨在筛选出对双条拂粉蚧(Ferrisia"virgata)毒杀效果较好的杀虫剂,为双条拂粉蚧的科学防治提供依据。采用喷雾法在室内测定14种杀虫剂在6、12、24、48"h对双条拂粉蚧的毒杀效果,对效果较好的7种杀虫剂测定处理24、48"h对双条拂粉蚧3龄若虫的致死中浓度(median"lethal"concentration,"LC50);基于各杀虫剂的推荐使用剂量,采用人工喷雾法于2024年5月在海南省三亚市崖州区槟榔园对啶虫脒、氟啶虫胺腈、甲氰菊酯、二嗪磷、噻虫嗪、丙·虱螨脲、氟啶虫酰胺·联苯菊酯进行双条拂粉蚧田间防效评价。初步筛选结果显示,啶虫脒、氟啶虫胺腈、甲氰菊酯、二嗪磷、噻虫嗪、丙·虱螨脲、氟啶虫酰胺·联苯菊酯对双条拂粉蚧3龄若虫的毒杀效果较好,药后48"h的死亡率均在70%以上。室内毒力测定结果显示,处理后24、48"h,7种药剂的相对毒力由大到小依次为噻虫嗪、甲氰菊酯、氟啶虫胺腈、啶虫脒、二嗪磷、氟啶虫酰胺·联苯菊酯、丙·虱螨脲。田间药效试验结果显示,噻虫嗪、甲氰菊酯、氟啶虫胺腈和啶虫脒的田间防效较好,药后1~7"d的校正防效达60%以上,二嗪磷、氟啶虫酰胺·联苯菊酯、丙·虱螨脲药后7"d的校正防效低于60%,噻虫嗪对双条拂粉蚧的田间防效最佳,施药1"d后校正防效为90.13%,施药3"d后校正防效达到峰值94.53%,施药7"d后校正防效降至87.20%,显著高于其他杀虫剂。研究结果表明,噻虫嗪、甲氰菊酯、氟啶虫胺腈对双条拂粉蚧兼具较好的室内杀虫活性与田间防效。本研究结果为选择合适的药剂防治双条拂粉蚧提供科学依据,也为槟榔黄化病的防控提供技术支撑。
关键词:双条拂粉蚧;杀虫剂;室内毒力;田间药效;槟榔黄化病中图分类号:S763.7""""""文献标志码: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
槟榔(Areca"catechu"L.)是东南亚地区最具经济意义的热带作物之一,因其作为嗜好品而广受欢迎,在中国和印度商业价值最高。2020年,我国海南省槟榔果的总产值达到146.8亿元(约20亿美元),为220万农民提供了重要的收入来源[1-2]。槟榔黄化病(yellow"leaf"disease,"YLD)是一类危害槟榔的毁灭性病害,对槟榔产业造成重大的经济损失[3-4]。2020年本团队通过关联性分析发现槟榔黄化相关病毒(Areca"palm"velari virus"1,"APV1)与海南槟榔黄化病高度相关[3,"5]。虫媒接种试验证明槟榔园中天然分布的双条拂粉蚧(Ferrisia"virgata)和柑桔棘粉蚧(Pseudococcus"cryptus)是APV1的传播媒介,可从染病槟榔上100%获毒并将APV1传播至健康槟榔植株,随接种时间的延长,槟榔APV1病毒含量越高,致使槟榔出现典型的叶肉黄化,叶脉保持绿色的黄化症状,且双条拂粉蚧获毒能力测定显示最短获毒时间为1"h[6-7]。
双条拂粉蚧隶属半翅目(Hemiptera)蚧总科(Coccoidea)粉蚧科(Pseudococcidae)拂粉蚧属(Ferrisia),又称丝粉蚧、条拂粉蚧、橘腺刺粉蚧、大长尾介壳虫。该虫普遍分布于非洲、东南亚、夏威夷等热带和亚热带区域,在我国长江流域以南部分地区也有分布[6,"8-9]。双条拂粉蚧主要为害槟榔叶片,其中以下层4片老叶为主,少量为害树干。成虫和若虫长期聚集于老叶背面,通过特有的刺吸式口器吸食组织汁液,被为害槟榔叶片出现黄色或黄褐色斑点,严重时叶片干枯坏死。此外,在聚集为害的叶背,双条拂粉蚧可分泌大量蜜露,诱发煤烟病,破坏叶片光合作用。为害花序严重时花序干枯,造成落花落果[10-12]。双条拂粉蚧是为害海南省槟榔的重要害虫,其以半持久方式传播APV1病毒,APV1病毒病传染性强,危害严重,可造成槟榔产量显著下降,甚至绝收[6]。
目前,针对APV1病毒引起的槟榔黄化病缺乏有效的防治手段和方法,而切断传播途径是防治槟榔黄化病的关键手段[1,"13-14]。关于双条拂粉蚧防治方面的研究尚无报道,为了筛选出能有效防治双条拂粉蚧的药剂,本研究利用喷雾法测定了14种药剂对双条拂粉蚧3龄若虫的毒杀效果,通过室内毒力和田间防治效果验证,筛选出对双条拂粉蚧具有高效防治效果的药剂,为防控槟榔黄化病提供科学依据。
1""材料与方法
1.1""材料
1.1.1""供试昆虫""双条拂粉蚧于2024年1月10日采自海南省三亚市崖州区槟榔园,在室内以南瓜为饲料进行脱毒,续代饲养,饲养条件:温度为(28±1)℃,相对湿度为75%~80%,弱光条件的养虫室内[6]。
1.1.2""供试药剂""供试药剂如表1所示。
1.2""方法
1.2.1""药剂配制""每种药剂根据有效成分含量用清水配制成浓度为1"mg/L的药剂母液100"mL。后续初筛试验和室内毒力测定试验时再用清水稀释成不同浓度。
1.2.2""生物测定方法""采用喷雾法[15-16]。供试药剂用清水稀释成不同浓度梯度的药剂溶液,用毛笔挑取双条拂粉蚧3龄若虫至铺有滤纸的培养皿(直径9"cm)内,每皿放置20头。使用盛有药液的喷瓶对准培养皿连续喷4~6次,使培养皿和虫体充分接触药液,用吸水纸吸取多余药液,盖好培养皿盖子。药剂初筛试验设置14个处理,每处理3次重复,以清水为对照[17]。药剂毒力测定试验设置35个处理,每处理3次重复,以清水为对照。置于温度为(28±1)℃、相对湿度为(65±10)%、光暗比(L∶D)为14"h∶10"h的人工气候箱中饲养观察[18]。药剂初筛试验6、12、24、48"h后检查存活虫数和死亡虫数,药剂毒力测定试验24、48"h后检查存活虫数和死亡虫数。用毛笔轻碰后虫体不动、足不能动的视为死亡。每个处理4次重复。
1.2.3""7种药剂对双条拂粉蚧的田间防效测定""根据1.2.2的试验结果选择药效较好的7种药剂,然后配制成厂家推荐使用的最低浓度,以清水作为空白对照进行田间试验。在三亚崖州区槟榔园中进行田间防效试验,以喷雾施药。虫口基数调查以槟榔植株为单位,每5株为1个小区,每小区作为1个处理,随机抽取2株槟榔(标记)进行调查,3次重复,取平均数作为虫口基数。用小型喷雾器对所调查小区的槟榔均匀喷雾,并于施药后1、3、7"d分别调查标记槟榔植株上残存的双条拂粉蚧活虫数量。
1.3""数据处理
采用Excel"2019软件进行试验数据的统计与分析,采用SPSS"22.0软件计算药剂的毒力回归方程、致死中浓度(LC50)、95%置信区间,以及分析相同药剂不同时间或不同浓度处理后双条拂粉蚧死亡率的差异显著性。相对毒力指数=供试药剂中最大LC50值/供试药剂LC50值[18-19],其他指标分别按下列公式计算:
2""结果与分析
2.1""14种药剂处理后双条拂粉蚧3龄若虫的死亡率
根据预试验,使用不同药剂0.01"mg/L浓度处理后双条拂粉蚧3龄若虫的校正死亡率见表2。三氟苯嘧啶、啶虫脒、氟啶虫胺腈、稻丰散、二嗪磷、甲氰菊酯、噻嗪酮、噻虫嗪、螺虫乙酯、氟啶虫酰胺·联苯菊酯及矿物油11种药剂在0.01"mg/L的浓度下,24"h内双条拂粉蚧的校正死亡率存在明显变化,并随处理时间的延长,其校正死亡率逐渐增大。喷施啶虫脒、氟啶虫胺腈、甲氰菊酯、二嗪磷、噻虫嗪、丙·虱螨脲、氟啶虫酰胺·联苯菊酯后48"h,双条拂粉蚧的校正死亡率均在70%以上;喷施三氟苯嘧啶、稻丰散、噻嗪酮、螺虫乙酯后48"h,双条拂粉蚧的校正死亡率均在20%~50%之间;喷施吡丙醚、喹硫磷、矿物油后48"h,双条拂粉蚧的校正死亡率均在20%以下。结果表明,啶虫脒、氟啶虫胺腈、甲氰菊酯、二嗪磷、噻虫嗪、丙·虱螨脲、氟啶虫酰胺·联苯菊酯7种药剂对双条拂粉蚧的毒杀效果最好,而吡丙醚、喹硫磷、矿物油的毒杀效果最差。
2.2""7种药剂的室内毒力测定
2.2.1""不同药剂处理后双条拂粉蚧3龄若虫的死亡率""根据2.1的药剂筛选试验,选出杀虫效果较好的7种药剂进行室内毒力测定。由表3可知,药后24、48"h,相同药剂不同浓度时,随药剂浓度的升高,双条拂粉蚧的校正死亡率逐渐增大,最高浓度和最低浓度的校正死亡率达显著性差异;同一药剂随处理时间的延长,其校正死亡率逐渐增大。噻虫嗪对双条拂粉蚧3龄若虫的毒杀效果最好,在浓度0.000"040"mg/L时,药后48"h的校正死亡率在50.00%以上。丙·虱螨脲对双条拂粉蚧3龄若虫的毒杀作用最差,药后48"h,最高剂量0.015"mg/L的校正死亡率为86.67%。
2.2.2""不同药剂处理后双条拂粉蚧3龄若虫的LC50值及相对毒力指数""7种不同药剂处理后双条拂粉蚧3龄若虫的LC50值及相对毒力指数见表4。采用喷雾法测定结果显示,丙·虱螨脲对双条拂粉蚧3龄若虫的LC50值最大,因此在计算相对毒力指数时以该药剂的LC50值作为参照基础,即为1。药后24"h,7种药剂的相对毒力由大到小依次为噻虫嗪、甲氰菊酯、氟啶虫胺腈、啶虫脒、二嗪磷、氟啶虫酰胺·联苯菊酯、丙·虱螨脲;药后48"h,7种药剂相对毒力的大小顺序未发生改变。药后24、48"h,噻虫嗪、甲氰菊酯、氟啶虫胺腈和啶虫脒的相对毒力均排在前4位,药后24"h,上述4种药剂的LC50值分别为6.054×10–5、5.104×10–4、6.541×10–4、1.730×10–3"mg/L,药后48"h的LC50值分别为2.982×10–5、1.672×10–4、2.245×10–4、5.030×10–4"mg/L。在施药后24、48"h,噻虫嗪的相对毒力指数分别为146.91和54.53,均排在第1位,表明噻虫嗪对双条拂粉蚧3龄若虫的毒杀效果最好。
2.3""7种药剂对双条拂粉蚧的田间防效
对室内毒力表现较好的7种药剂开展田间防效试验,结果显示,药后1~7"d噻虫嗪、甲氰菊酯、氟啶虫胺腈和啶虫脒的校正防效均达60%以上,其余3种药剂药后7"d的校正防效均低于60%(表5),表明噻虫嗪、甲氰菊酯、氟啶虫胺腈和啶虫脒对双条拂粉蚧田间种群防治效果较好。
3""讨论
双条拂粉蚧作为一种害虫,不仅取食寄主叶片、分泌蜜露为害作物[9,"12,"20],还因其具有刺吸式口器,作为可可肿枝病毒(Cacao"swollen"shoot"virus,"CSSV)和胡椒黄斑驳病毒(Piper"yellow"mottle"virus,"PYMV)的传播媒介[21-22],促进病毒的传播,致使大量农作物感病死亡。在海南省,双条拂粉蚧因传播APV1病毒,使大批槟榔黄化,产量下降,受到人们的广泛关注[6-7]。目前缺乏有效的措施防治槟榔黄化病,切断APV1的传播媒介是一个关键的手段。国内外对双条拂粉蚧防治研究的相关报道较少,借鉴经验也较少。其他粉蚧类害虫的化学防治研究表明,高效氯氟氰菊酯、丙溴磷、毒死蜱和阿维菌素对棉花粉蚧具有较好的毒杀效果[18];烯啶虫胺对新菠萝灰粉蚧的触杀毒力最好,可作为防治新菠萝灰粉蚧的备选药剂[16];王伟兰等[23]研究认为丙溴磷、吡虫啉、毒死蜱等化学杀虫剂对扶桑绵粉蚧的直接毒杀效果显著;程东美等[24]研究表明灭多威、敌敌畏、毒死蜱、啶虫脒等农药对埃及吹绵蚧3龄若虫均有较好的室内和田间毒杀作用。由此可见,不同粉蚧对不同药剂的敏感度存在差异,使用具有针对性的化学药剂可以提高防治效果。为此,本团队开展市面上常规的14种药剂对双条拂粉蚧的毒杀效果研究,结果表明,14种药剂经过预试验确定使用浓度为0.01"mg/L,在保持其他相同条件的情况下,噻虫嗪、甲氰菊酯、氟啶虫胺腈、啶虫脒、二嗪磷、氟啶虫酰胺·联苯菊酯、丙·虱螨脲7种药剂对双条拂粉蚧3龄若虫的药效较好,进一步测定上述7种药剂对双条拂粉蚧3龄若虫的毒力及其田间防治效果。毒力测定表明,这7种药剂均对双条拂粉蚧3龄若虫有较好的触杀作用,无论是药后24"h还是48"h,噻虫嗪、甲氰菊酯、氟啶虫胺腈的相对毒力均排在前3位且噻虫嗪的效果最好,这3种药剂在田间试验中,药后1~7"d的校正防效达70%以上,其中噻虫嗪的防治效果达到85%,与其他药剂相比,噻虫嗪能够有效防治双条拂粉蚧3龄若虫。
噻虫嗪是一种第2代烟碱类高效低毒杀虫剂,杀虫谱广,对作物、环境安全且具有很强的叶片传导活性和根部内吸性,药剂能快速、充分被吸收,在植株体内滞留时间长,降解缓慢,同时其降解产物噻虫胺杀虫活性更高,持效期更长[16]。甲氰菊酯对害虫的击倒速度快,具有高效、广谱、低残留、持效期长的特点,在农业生产中被广泛应用[25-26]。氟啶虫胺腈作用于昆虫的神经系统,杀虫谱广,可通过叶、茎、根吸收进入植物体内,对害虫具有触杀和胃毒作用,药效快、持效期长[27]。白学慧等[12]研究表明,1000倍高效氯氟氰菊酯对双条拂粉蚧具有较好的毒杀效果,在发生虫害的咖啡园中每隔10"d喷施1次,喷施3次,经1"a监测未发现该虫再次发生。由此,也可以使用氯氟氰菊酯喷施槟榔,比较该药剂与本研究供试药剂的防治效果是否存在差异。因槟榔叶片蜡质层厚实,在喷施噻虫嗪、甲氰菊酯、氟啶虫胺腈时可辅以渗透剂,以便更好地发挥药效。综上所述,噻虫嗪、甲氰菊酯、氟啶虫胺腈在双条拂粉蚧的综合防治中具有重要的应用价值。
双条拂粉蚧繁殖力强,世代重叠严重,有群集习性,且善于隐藏,主要聚集在槟榔叶片背部、叶鞘等部位,隐藏槟榔叶片的裂缝和翘皮下[8,"28],使双条拂粉蚧的全面防治具有较大困难。在田间防治期间,可将本研究毒杀效果较好的噻虫嗪与其他内吸性药剂混合喷施,间隔15"d喷施1次,连续喷施3次,可达到较好的防治效果。不同龄期粉蚧对药剂的敏感性存在差异,印楝油对扶桑绵粉蚧的直接毒杀作用较弱,药后3"d对1龄若虫的致死率仅为66.43%,对其他虫龄几乎无直接毒杀作用,不同虫期中低龄若虫对药剂更敏感[23,"29];不同龄期新菠萝灰粉蚧对5种杀虫剂的敏感顺序为:1龄gt;2龄gt;3龄gt;雌成虫[16]。因此,使用适当的药剂消灭媒介昆虫,可以有效切断病害的传播途径,减少病源的扩散,降低槟榔黄化病的发生率,有助于种植户及时发现并处理虫害,减少病害对槟榔产量和品质的影响,促进槟榔产业的健康发展。
本研究从14种药剂里筛选出对双条拂粉蚧毒杀效果较好的3种药剂为噻虫嗪、甲氰菊酯、氟啶虫胺腈,但是本研究仅对双条拂粉蚧3龄若虫进行试验验证,后期有必要针对双条拂粉蚧虫卵及不同龄期进行药剂筛选,以期为槟榔黄化病的综合防治提供更科学、准确的理论依据。
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