农药学学报  2014, Vol. 16 Issue (6): 681-686   PDF    
亚致死浓度毒死蜱对小麦禾谷缢管蚜生长和繁殖的影响
谢桂英1, 孙淑君1, 赵艳芹1, 吴少英1, 吴国良2    
1. 河南农业大学 植物保护学院, 郑州 450002;
2. 河南农业大学 园艺学院, 郑州 450002
摘要:为探讨毒死蜱对小麦禾谷缢管蚜Rhopalosiphum padi(Linnaeus)的亚致死效应,采用玻璃管药膜法确定了其亚致死浓度 (LC10、LC20和LC30),并研究了该浓度下毒死蜱对小麦禾谷缢管蚜生长和繁殖的影响。结果表明:以LC10、LC20和LC30 浓度处理后,禾谷缢管蚜成蚜的寿命分别为(8.60±0.22)、(8.03±0.18)和(6.68±0.18) d,均显著短于对照的(10.36±0.31) d;单雌产仔量分别为(21.88±0.63)、(20.41±0.53)和(16.68±0.35)只,也均显著少于对照的(26.40±0.89)只;产仔历期分别为(7.55±0.22)、(6.69±0.17)和(5.64±0.15) d,均显著短于对照的(9.13±0.31) d;试验浓度药剂处理对下一代若蚜期的影响不显著;LC30浓度处理对下一代成蚜繁殖有显著的抑制作用,可减少单雌产仔量3.74只,缩短产仔历期1.39 d。生命表参数分析表明:LC30浓度毒死蜱处理使小麦禾谷缢管蚜的净增殖率(R0)比对照降低了34.71%,使种群加倍时间(t)比对照延长了17.37%;LC20浓度处理使小麦禾谷缢管蚜的平均世代历期(T)延长了12.59%;LC10浓度处理组各项指标与对照间无显著性差异。研究表明,亚致死浓度毒死蜱能够缩短小麦禾谷缢管蚜成蚜的寿命,降低其繁殖力,该结果对小麦禾谷缢管蚜综合防治策略的制定具有积极意义。
关键词禾谷缢管蚜     毒死蜱     亚致死效应     繁殖    
Sublethal effects of chlorpyrifos on the growth and reproduction of Rhopalosiphum padi
XIE Guiying1, SUN Shujun1, ZHAO Yanqin1, WU Shaoying1, WU Guoliang2    
1. College of Plant Protection, He'nan Agricultural University, Zhengzhou 450002, China;
2. College of Horticulture, He'nan Agricultural University, Zhengzhou 450002, China
Abstract: In order to provide guidance for rational application of chlorpyrifos and understand the sublethal effects of chlorpyrifos on Rhopalosiphum padi (Linnaeus), sublethal concentration (LC10, LC20 and LC30) of chlorpyrifos to adults of R.padi were determined by residual film in glass tube, and the sublethal effects on the growth and reproduction of R.padi were evaluated. Results showed that after being exposed to LC10, LC20 and LC30 of chlorpyrifos, the longevity of R.padi adult were (8.60±0.22), (8.03±0.18) and (6.68±0.18)days, respectively, which were significantly shorter than that of the control (10.36±0.31) days; the nymph number per aphid were (21.88±0.63), (20.41±0.53) and (16.68±0.35), respectively, which were significantly less than that of the control (26.40±0.89); the reproductive period were (7.55±0.220), (6.69±0.17) and (5.64±0.15) days, respectively, which were significantly shorter than that of the control (9.13±0.31) days. The duration of nymph of R.padi offspring was not affected significantly when the adult was exposed to sublethal concentration of chlorpyrifos. LC30 of chlorpyrifos could inhibit the offspring fecundity, the number of nymph per aphid decreased by 3.74 and reproductive period shortened by 1.39 days as compared with that of the control. The demographic growth parameters showed that the net reproductive rate(R0) of R.padi decreased by 34.71% and population doubling time(t) prolonged by 17.37% after exposure to LC30 of chlorpyrifos;the mean generation time(T)increased by 12.59% after exposure to LC20 of chlorpyrifos; no significant difference was observed between the parameters of LC10-treatment and control. The results that chlorpyrifos could reduce the longevity and reproduction of R.padi adult at sublethal concentration will be helpful in developing strategies for the IPM of R.padi.
Key words: Rhopalosiphum padi     chlorpyrifos     sublethal effect     reproduction    


禾谷缢管蚜Rhopalosiphum padi(Linnaeus)属半翅目、蚜科,是谷类作物上最为严重的害虫之一,也是我国小麦生产中的重要害虫[1, 2]。其起源于北美,现广泛分布于亚洲及世界各地[3]。禾谷缢管蚜会大量聚集在小麦叶片、茎秆和穗部,吸食汁液,同时还可传播小麦黄矮病病毒,造成小麦植株矮化,叶色变黄,严重影响小麦产量[2, 4]。化学防治仍是目前防治小麦禾谷缢管蚜的主要手段,但由于长期使用化学农药,已导致禾谷缢管蚜对多种药剂产生了抗药性[5, 6]

杀虫剂施用于田间后,高浓度时能直接杀死目标害虫,但随着时间的延长和空间的差异,其在环境中将会递减至亚致死剂量或浓度[7]。大部分杀虫剂在环境中往往以低浓度状态长期存在,因此对目标害虫的存活个体存在着亚致死效应。如亚致死剂量吡蚜酮(pymetrozine)能使禾谷缢管蚜的体重减轻,繁殖率降低[8];亚致死剂量的毒死蜱(chlorpyrifos)、硫丹(endosulfan)、氯氟氰菊酯(cyhalothrin)和吡虫啉(imidacloprid)能降低中黑盲蝽Adelphocoris suturalis Jakovlev的寿命,延长其下一代卵的发育历期[9]等。

毒死蜱是一种极广谱的有机磷类杀虫剂,其通过抑制昆虫体内乙酰胆碱酯酶活性,使神经突触部位乙酰胆碱大量积累,神经纤维长期处于兴奋状态,正常神经传导受阻,从而导致昆虫死亡[10]。毒死蜱具有强烈的触杀和胃毒作用,广泛用于防治棉花、果树、小麦和蔬菜上的蚜虫及其他害虫。已有研究表明:低浓度的毒死蜱能刺激斜纹夜蛾Spodoptera litura Fabricius 生长,显著增加幼虫和蛹的体重,加速昆虫的生长速度,缩短幼虫发育历期[11];亚致死剂量的毒死蜱对灰飞虱Laodelphax striatellus (Fallén)蜜露分泌量、虫体增重和单雌产卵量均表现出不同程度的促进作用[12]。而关于亚致死浓度毒死蜱对禾谷缢管蚜生长繁殖的影响尚未见详细报道。笔者采用玻璃管药膜法[13, 14],研究了亚致死浓度毒死蜱对小麦禾谷缢管蚜生长发育及繁殖的影响,旨在为毒死蜱的合理应用及小麦禾谷缢管蚜的综合治理提供科学依据。 1 材料与方法 1.1 药剂及试虫

96.0%的毒死蜱(chlorpyrifos)和98.0%吡虫啉(imidacloprid)原药,购自扬州化工股份有限公司。

供试禾谷缢管蚜Rhopalosiphum padi 于 2006年采自河南省郑州市河南农业大学科教园区,并在室内饲养[15]多年,取健康无翅成蚜供试。 1.2 毒力测定

采用玻璃管药膜法[13, 14]。先将毒死蜱和吡虫啉原药用丙酮配制成1 000 mg/L的母液,使用时再用丙酮稀释成所需浓度。在指形管(d=1.6 cm,h=10 cm,s=52.25 cm2)中注入200 μL配制好的药液,反复转动指形管以保证药液充分布满其内表面,待丙酮挥发完全后,接入健康一致的无翅成蚜。对照单独用丙酮处理。将处理后试虫放入人工气候箱内[温度(21±1) ℃,光周期L∶D=16 h∶8 h,相对湿度75%],3 h后检查死亡率,将其中只有一条腿动或者完全不动者记为死亡,对照死亡率小于10%为有效测定,并用对照死亡率对结果进行校正。 1.3 毒死蜱亚致死效应测定 1.3.1 亚致死浓度毒死蜱对禾谷缢管蚜生殖力的影响

试验共设LC10、LC20、LC30浓度毒死蜱及对照(丙酮)4组处理,3 h后去除死虫,每组挑取40~50头活跃的试虫放入指形管中单头培养。指形管中预先放入已培养5~7 d的麦苗,根部包棉花保湿,3 d更换一次麦苗,每天记录所产若蚜数并将其移走,统计成蚜的产仔量、产仔历期及寿命。 1.3.2 亚致死浓度毒死蜱对禾谷缢管蚜下一代生长发育及繁殖的影响

分别挑取LC10、LC20、LC30浓度毒死蜱及对照丙酮处理组试虫的初孵若蚜,每处理60~80头,放入指形管中单头培养,于每天早晚观察2遍,记录若蚜发育历期及成蚜的产仔量、产仔历期及寿命。 1.3.3 种群生命表构建

生命表构建及分析参照张孝羲等的方法[16, 17]

净增殖率R0lxmx;平均世代历期Txlxmxlxmx;内禀增长率rm=lnR0/T;周限增长率λ=exp(rm);种群加倍时间t=ln2/rm

其中,x为时间间隔(d),lx表示任一个体在x期间的存活率,mx表示在x期间的平均单雌产仔量(只)。 1.4 数据处理

试验结果采用SPSS 16.0软件处理,得到毒力回归方程及LC50、LC10、LC20和LC30值。生物学指标的统计分析采用方差分析法,应用SPSS 16.0的Turkey′s HSD检验,当P<0.05时为差异显著。 2 结果与分析 2.1 毒死蜱对禾谷缢管蚜成蚜的触杀毒力及亚致死浓度

毒力测定结果见表 1,从中可看出,毒死蜱对小麦禾谷缢管蚜无翅成蚜的LC50值显著低于吡虫啉,表明其对小麦禾谷缢管蚜具有较强的触杀毒力。

表 1 毒死蜱对小麦禾谷缢管蚜成蚜的毒力 Table 1 Toxicity of chlorpyrifos to R.padi adults
2.2 亚致死浓度毒死蜱对禾谷缢管蚜成蚜生物学特性的影响

经亚致死浓度的毒死蜱处理后,小麦禾谷缢管蚜成蚜的寿命、单雌产仔量和产仔历期见表 2。结果表明,各亚致死浓度处理组成蚜的寿命均显著低于对照组(F3,167=28.69,P<0.001),单雌产仔量均显著低于对照组(F3,167=23.87,P<0.001),产仔历期也均显著低于对照组(F3,167=26.77,P<0.001),表明亚致死浓度的毒死蜱能显著缩短小麦禾谷缢管蚜成蚜的寿命及产仔历期,降低其单雌产仔量。

表 2 亚致死浓度毒死蜱对禾谷缢管蚜生物学特性的影响 Table 2 Effect of sublethal concentration of chlorpyrifos on some biological traits of R.padi
2.3 亚致死浓度毒死蜱对下一代禾谷缢管蚜生长发育的影响

结果(表 3)表明,3个亚致死浓度毒死蜱处理对小麦禾谷缢管蚜3龄历期、4龄历期及若蚜期均无显著影响。与对照相比,仅LC20浓度毒死蜱处理显著缩短了1龄若蚜的发育历期(F3,188=3.02,P=0.031),延长了2龄若蚜的发育历期(F3,188=8.29,P<0.001);LC10浓度处理后1龄和2龄若蚜的发育历期与对照相比无显著差异。

表 3 亚致死浓度毒死蜱对禾谷缢管蚜下一代若蚜生长发育的影响 Table 3 Effect of sublethal concentration of chlorpyrifos on nymph development of R.padi offspring
2.4 亚致死浓度毒死蜱对下一代禾谷缢管蚜成蚜寿命及繁殖的影响

结果(表 4)表明:亚致死浓度的毒死蜱处理能够影响下一代小麦禾谷缢管蚜成蚜的寿命、单雌产仔量及产仔历期,表现为随药剂浓度增加,成蚜寿命缩短,蚜虫全世代周期缩短,单雌产仔量降低,产仔历期缩短。其中,LC30浓度处理组上述指标与对照间均差异显著:下一代小麦禾谷缢管蚜成蚜寿命缩短1.53 d(F3,188=7.34,P<0.001),蚜虫全世代周期缩短1.32 d(F3,188=4.67,P=0.004),单雌产仔量减少3.74只(F3,188=8.01,P<0.001),产仔历期缩短1.39 d(F3,188=7.47,P<0.001)。

表 4 亚致死浓度毒死蜱对禾谷缢管蚜下一代成蚜寿命及繁殖的影响 Table 4 Effect of sublethal concentration of chlorpyrifos on some biological traits of R.padi offspring adults
2.5 亚致死浓度毒死蜱对禾谷缢管蚜种群生命表参数的影响

表 5可知:与对照相比,LC10和LC20浓度毒死蜱处理后禾谷缢管蚜种群的净增殖率(R0)有所增加,而LC30浓度处理组的R0却显著降低(F3,8=38.023,P<0.001);LC20浓度处理组平均世代历期(T)比对照显著延长(F3,8=6.233,P=0.017),而LC10浓度处理组T值比对照有所降低,但差异不显著;经3个亚致死浓度的毒死蜱处理后,禾谷缢管蚜种群的内禀增长率(rm)(F3,8=3.357,P=0.076)和周限增长率(λ)(F3,8=0.597,P=0.634)与对照间均不存在显著差异;与对照相比,3个亚致死浓度毒死蜱处理均能影响小麦禾谷缢管蚜的种群加倍时间(t),其中,LC30浓度处理组t值显著高于对照,而LC10和LC20处理组t值有所变化,但差异不显著(F 3,8=12.819,P=0.002)。

表 5 亚致死浓度毒死蜱处理后小麦禾谷缢管蚜的种群生命表参数 Table 5 Life table parameters of R.padi treated by sublethal concentration of chlorpyrifos
3 结论与讨论

已有研究表明,亚致死剂量药剂会影响害虫的生殖力、行为和取食等多个方面[18, 19]。不同杀虫剂对不同害虫所产生的亚致死效应不同,一些药剂的亚致死剂量能刺激害虫生殖,从而导致害虫的再猖獗[20, 21];而另一些研究则表明,亚致死剂量的杀虫剂可对害虫个体发育、取食行为、生殖和寿命等产生抑制作用,从而能持续控制害虫的危害[8, 22],甚至能增强某些药剂的田间防治效果,尤其是在作物生长后期[23, 24]。本研究结果表明,亚致死浓度的毒死蜱能够显著缩短小麦禾谷缢管蚜及其下一代成蚜的寿命及产仔历期,降低单雌产仔量,表明亚致死浓度毒死蜱对禾谷缢管蚜生殖及其后代的繁衍存在不利影响,这与谢佳燕等[25]研究亚致死剂量吡虫啉对禾谷缢管蚜生长发育影响的结果相似。生命表参数分析结果表明,与对照相比,LC30浓度处理组的净增殖率(R0)明显降低,内禀增长率(rm)和周限增长率(λ)均有所降低,平均世代历期(T)和种群加倍时间(t)有所延长;而LC10和LC20浓度处理组R0、rm、λ和t值虽然也有所变化,但与对照间差异不显著。据此可以推测,当田间使用毒死蜱防治小麦禾谷缢管蚜时,将分别对其产生致死效应和亚致死效应,当其浓度降至亚致死浓度时,仍能显著抑制禾谷缢管蚜的增殖,从而保持一定的防治效果。亚致死剂量杀虫剂对昆虫生殖力的影响有多种原因:一些杀虫剂可起到拒食剂的作用,通过抑制昆虫取食,导致营养匮乏而降低生殖力[26];另一些杀虫剂则可通过干扰昆虫体内性信息素的通讯行为,从而影响昆虫的繁殖[27, 28]

昆虫的生长发育及繁殖是一个复杂的过程,涉及众多物质代谢、能量代谢及激素调节等生理生化过程,本研究仅观测了亚致死浓度毒死蜱对小麦禾谷缢管蚜生长发育部分生物学指标的影响,关于造成这些影响的生理生化及分子机理等还有待进一步研究。

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