Effects of sublethal concentrations of beta-cypermethrin on the biological characteristics of <em>Carposina sasakii</em> (Lepidoptera: Carposinidae)
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ACTA ENTOMOLOGICA SINICA  2017, Vol. 60 Issue (7): 799-808    DOI: 10.16380/j.kcxb.2017.07.008
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Effects of sublethal concentrations of beta-cypermethrin on the biological characteristics of Carposina sasakii (Lepidoptera: Carposinidae)
QUAN Lin-Fa, QIU Gui-Sheng, SUN Li-Na, LI Yan-Yan, YAN Wen-Tao, YUE Qiang, ZHANG Huai-Jiang*
 (Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng, Liaoning 125100, China)
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Abstract 【Aim】 This study aims to explore the effects of beta-cypermethrin (β-cypermethrin) on the biological characteristics of Carposina sasakii Matsumura, especially the sublethal effects of beta-cypermethrin on the development, survivorship and reproduction of the F0 (parental) and F1 generations of C. sasakii. 【Methods】 The sublethal concentrations (LC10, LC20 and LC40) of β-cypermethrin against the newly hatched larvae of C. sasakii were determined by fruitdipping method. The mortality of C. sasakii was recorded at 24 h after treatment and the LC10, LC20 and LC40 values were estimated using DPS software. Sublethal effects of β-cypermethrin on the development and reproduction of the F0 and F1 generations were assessed by establishing a life table. The statistical differences of the survivorship and developmental duration, the adult longevity, the number of eggs laid per female and life table parameters of F0 and F1 generations were analyzed with SPSS 21.0. 【Results】 According to the bioassay results, the LC10, LC20 and LC40 values of β-cypermethrin on the newly hatched larvae of C. sasakii at 24 h after treatment were 0.146, 0.267 and 0.579 mg/L, respectively. Sublethal concentrations of β-cypermethrin reduced the survivorship and the proportion of female adults of F0 and F1 generations. The values of boring rate, exiting rate, and survival rate of larvae, emergence rate and sex ratio (♀/♂) reduced with the increase of the insecticide concentration. After the newly hatched larvae of F0 generation were exposed to the sublethal concentrations (LC10, LC20 and LC40) of β-cypermethrin, the average numbers of eggs laid per female per day were 34.09, 33.00 and 30.12, respectively; correspondingly, the numbers of eggs laid per female were 284.90, 276.56 and 252.89, respectively, both were significantly less than those of the control (38.02 and 320.98, respectively). When the newly hatched larvae of F1 generation were exposed to LC10, LC20 and LC40 of β-cypermethrin, the average numbers of eggs laid per female per day were 34.57, 30.82 and 33.39, respectively, which were significantly higher than that of the control (27.97). Meanwhile, the numbers of eggs laid per female after treatment with β-cypermethrin at LC20 and LC40 were 304.45 and 298.31, respectively, which were significantly higher than that of the control (271.40). However, there was no significant difference in the developmental duration of each stage and the larval weight as compared with the control. Life table analysis showed that the net reproductive rate (R0) decreased significantly in a dose-dependent manner after treatment. The R0 values of the F0 generation decreased significantly after treatment with β-cypermethrin at LC10, LC20 and LC40 with the values of 124.36, 114.33 and 60.16, respectively, as compared with the control (166.54), while the corresponding values of the F1 generation were 128.84, 112.30 and 85.32, respectively, as compared with the control (128.80). Sublethal concentrations of β-cypermethrin obviously reduced the relative fitness value (Rf) of the F0 and F1 generations. The Rf values of the F0 generation after treatment with β-cypermethrin at LC10, LC20 and LC40 were only 0.75-, 0.68- and 0.37-fold as high as that of the control, while those of the F1 generation increased to 0.98-, 0.86- and 0.64-fold as high as that of the control. 【Conclusion】 Sublethal concentrations of β-cypermethrin influence the survivorship, growth and reproduction of F0 and F1 generations of C. sasakii, consequently affecting its population dynamics. β-cypermethrin applied singly or sequentially would inhibit the population growth rate of C. sasakii, but its reproductive disadvantage would be improved after a secondary or more treatments.
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QUAN Lin-Fa
CHOU Gui-Sheng
SUN Li-Na
LI Yan-Yan
YAN Wen-Tao
YUE Qiang
ZHANG Huai-Jiang
Key wordsCarposina sasakii   beta-cypermethrin   sublethal concentration   biological characteristics   life table   relative fitness     
Cite this article:   
QUAN Lin-Fa,CHOU Gui-Sheng,SUN Li-Na et al. Effects of sublethal concentrations of beta-cypermethrin on the biological characteristics of Carposina sasakii (Lepidoptera: Carposinidae)[J]. ACTA ENTOMOLOGICA SINICA, 2017, 60(7): 799-808.
URL:  
http://www.insect.org.cn/EN/10.16380/j.kcxb.2017.07.008      or     http://www.insect.org.cn/EN/Y2017/V60/I7/799
 
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