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  • Monthly, Founded in 1950
    Supervisor:Chinese Academy of Sciences
    Sponsor:Institute of Zoology,Chinese Academy of Sciences
    The Entomological Society of China
    Domestic postal code: 2-153
    Foreign issuance code: Q61
    ISSN 0454-6296
    CN 11-1832/Q
Table of Content
20 July 2016, Volume 59 Issue 7
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  • RESEARCH PAPERS
    Effects of venom of Chouioia cunea (Hymenoptera: Eulophidae) on the hemocyte immunity of Hyphantria cunea (Lepidoptera: Arctiidae) pupae
    XIN Bei , ZHANG Shao-Bin, LIU Pei-Xuan, ZHENG Ya-Nan
    2016, 59(7):  699-706.  doi:10.16380/j.kcxb.2016.07.001
    Abstract ( 1215 )   PDF (1326KB) ( 433 )     
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    【Aim】 This study aims to clarify the effects of Chouioia cunea venom on the cellular defense of hemocytes in Hyphantria cunea pupae. 【Methods】 Granulocytes of H. cunea pupa were separated by Na2-EDTA treatment, and plasmatocytes were separated by nylon wool method. Cell culture in vitro was used to assess the effects of parasitoid C. cunea venom on encapsulation and phagocytosis of host H. cunea hemocytes. 【Results】 The encapsulation capacity of granulocytes of H. cunea was stronger than that of plasmatocytes. The encapsulation capacity of hemocytes was significantly inhibited by the parasitoid venom, and deceased gradually with the increase of venom concentration. The encapsulation capacity of both plasmatocytes and granulocytes increased at the beginning and then decreased gradually during the treatment of parasitoid venom. The encapsulation capacity of granulocytes in the treatment groups with different concentrations of venom reached to the maximum at 12 h after treatment. In the control group, the encapsulation capacity of plasmatocytes reached to the strongest at 15 h. However, the encapsulation capacity of plasmatocytes was the strongest at 12 h when they were treated by 0.01-0.03 VRE/μL parasitoid venom, while it was the strongest at 9 h when they were treated by 0.04-0.10 VRE/μL venom. The phagocytosis of C. cunea venom on granulocytes of H. cunea pupae was strongerthan that on plasmatocytes. The phagocytosis capacity of hemocytes was significantly inhibited by the parasitoid venom. However, the inhibition of plasmatocytes by the parasitoid venom was not as strong as that of granulocytes. 【Conclusion】 The venom of C. cunea can inhibit the encapsulation and phagocytosis of the granulocytes and plasmatocytes of H. cunea, and the cellular immunity significantly decreases with the increase of venom concentration.
    Effects of kidney bean damaged by Frankliniella occidentalis (Thysanoptera: Thripidae) or Tetranychus urticae (Acari: Tetranychidae) on the activities of protective and detoxification enzymes in the other subsequent herbivore of both
    ZHI Jun-Rui, TIAN Tian, WEN Juan, LIU Yong
    2016, 59(7):  707-715.  doi:10.16380/j.kcxb.2016.07.002
    Abstract ( 1242 )   PDF (959KB) ( 464 )     
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    【Aim】 Insect feeding can induce the defense responses of host plants. Different species feeding on the same host plant may have different physiological adaptation. This study aims to investigate the effects of plant damaged by one pest on the enzyme activities in the other subsequent herbivore. 【Methods】 Biochemistry analysis method was used to study the changes in activities of protective enzymes [peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD)] and detoxification enzymes [mixed-function oxidase (MFO), carboxylesterase (CarE), glutathione S-transferase (GSTs) and acetylcholin esterase (AchE)] in deutonymphs and female adults of Tetranychus urticae at different time points after feeding on kidney bean plants damaged by the 2nd instar nymphs of Frankliniella occidentalis and in the 2nd instar nymphs and female adults of F. occidentalis at different time points after feeding on bean plants damaged by female adults of T. urticae. 【Results】 The activities of POD, CAT and SOD in female adults of T. urticae at 5 h after feeding on bean plants damaged by F. occidentalis (BPDF) were significantly higher than those after feeding on healthy bean plants (HBP) (P<0.01), whereas the POD activity in female adults at 18 h after feeding on BPDF was lower than that after feeding on HBP (P<0.01). The CAT activity in deutonymphs of T. urticae at 5 h after feeding on BPDF was significantly higher than that after feeding on HBP (P<0.01). At 5 h after feeding on BPDF, the activities of MFO and CarE in female adults of T. urticae were suppressed (P<0.01), while the GSTs and AchE activities were higher than those after feeding on HBP (P<0.01). At 18 h after feeding on BPDF, only MFO activity was different from that at 5 h. Only MFO activities in deutonymphs of T. urticae at 5 h or 18 h after feeding on BPDF were higher than those after feeding on HBP (P<0.01). The activities of POD, CAT, and SOD in female adults of F. occidentalis at 5 h or 18 h after feeding on bean plants damaged by T. urticae (BPDT) significantly increased (P<0.01), whereas only the CAT activity in 2nd instar nymphs significantly rose as compared with the control (P<0.01). At 5 h after feeding on BPDT, the changes in detoxification enzymes activities in female adults of F. occidentalis were the same as those in female adults of T. urticae, while at 18 h after feeding, their GSTs activities were different from those at 5 h after feeding. Changes in the activities of detoxification enzymes except GSTs in the 2nd instar nymphs of F. occidentalis were just the opposite at 5 h and at 18 h after feeding. 【Conclusion】 Bean plants damaged by F. occidentalis or T. urticae could cause a series of stress responses in the other subsequent herbivore between T. urticae and F. occidentalis. Changes in activities of protective and detoxification enzymes in adults of the two pests at 5 h after feeding were the same, while they were different at other time after feeding and in other developmental stages. The results suggest that the activities of protective and detoxification enzymes in the two pests have somewhat similar change patterns and their changes also are related with pest species, developmental stages and feeding time. The two pests might have various mechanisms of physiological adaptation to plants damaged by insect herbivores.
    Molecular cloning, characterization and induced expression analysis of ion channel gene RSC1 in Rhopalosiphum padi (Hemiptera: Aphididae)
    LIN Fang-Fei, ZUO Ya-Yun, ZHAO Qi, DUAN Xin-Le, LI Yu-Ting, CHEN Mao-Hua
    2016, 59(7):  716-723.  doi:10.16380/j.kcxb.2016.07.003
    Abstract ( 1595 )   PDF (1367KB) ( 396 )     
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    【Aim】 SC1 (sodium channel 1) is an important ion channel in arthropods including insects. It is considered as a possible new neuro target. This study aims to investigate the SC1 gene from Rhopalosiphum padi, and to analyze the primary biological functions of the gene and the evolutionary relationship of SC1 channels with voltage-gated sodium channel and voltage-gated calcium channel. 【Methods】 RT-PCR technique was used to clone the full-length ORF of RC1 gene from R. padi. After R. padi adults were exposed to different concentrations of λ-cyhalothrin for 6 and 24 h, respectively, the expression levels of SC1 were analyzed by real-time quantitative PCR. 【Results】 The ORF of RSC1 (GenBank accession no: KU640190) is 6 687 bp in length with the deduced amino acid sequence of 2 228 residues. Structural analysis showed that the RSC1 has the typical structural feature of SC1 channel, and contains a unique DEEA motif, which is different from the motif of sodium channel and calcium channel. Phylogenetic analysis indicated that RSC1 and its orthologs from other animals consist of a sub-group, which is more similar to the sodium channel family. In R. padi adults exposed to λ-cyhalothrin for 6 h, the expression level of RSC1 gene significantly decreased to 0.57-, 0.82- and 0.78-fold that of the control, respectively, while increased to 2.19-, 1.33- and 1.19-fold that of the control, respectively, after 24 h insecticide exposure. The expression level of RSC1 significantly increased in R. padi adults exposed to λ-cyhalothrin at the dosage of LC15 (0.1484 mg/L). 【Conclusion】 The SC1 channel family are evolutionarily closer to the voltage-gated sodium channel family. RSC1 is the possible secondary target of λ-cyhalothrin. Since RSC1 gene and its orthologs have been found in invertebrates but not in vertebrates, these channels can be used as neurotarget to develop novel insecticides.      
    microRNA Novel-31* up-regulates the expression of hemocytin gene in the silkworm, Bombyx mori
    SHI Li-Li, GENG Tao, WU Ping, PAN Zhong-Hua, QIN Guang-Xing, GAO Kun, HOU Cheng-Xiang, GUO Xi-Jie
    2016, 59(7):  724-731.  doi:10.16380/j.kcxb.2016.07.004
    Abstract ( 1496 )   PDF (4628KB) ( 468 )     
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    【Aim】 Novel-31* is one of the miRNAs identified in the silkworm (Bombyx mori ) larvae infected by B. mori cytoplasmic polyhedrosis virus (BmCPV). This study aims to predict its target genes and verify its function in regulation of target gene expression, so as to further study the roles of miRNAs and their target genes in insect immune regulation. 【Methods】 The putative target genes of miRNA Novel-31* were predicted by bioinformatics approach, and the expression patterns of Novel-31* and the predicted target gene were detected using real-time quantitative PCR at different time points in the silkworm larvae infected by BmCPV. Lentiviral expression vectors respectively expressing Novel-31* and the target gene were constructed and transfected into 293T cells. At the same time, Novel-31* mimics was synthesized and transfected into silkworm cell line BmN. The regulation of Novel-31* on target gene expression was verified by real-time quantitative PCR. 【Results】 Bioinformatics analysis predicted that hemocytin gene is one of the putative target genes of Novel-31* and its 5′ UTR region is the binding site for Novel-31*. Real-time quantitative PCR analysis indicated that the expression levels of both Novel-31* and the hemocytin gene were up-regulated obviously in the hemolymph of silkworm larvae infected with BmCPV. Lentiviral expression vectors respectively expressing Novel-31* and the 5′UTR region of hemocytin gene were successfully constructed and transfected into 293T cells. Real-time quantitative PCR detection verified that Novel-31* up-regulated the target gene expression. Furthermore, transfection of Novel-31* mimics into silkworm cell line BmN also resulted in the up-regulation of expression of the hemocytin gene. 【Conclusion】 Hemocytin gene is a target gene for miRNA Novel-31*. Novel-31* can bind to the 5′ UTR region of the target gene and up-regulate obviously its expression.    
    Fumigation and repellent activities of the optical isomers of carvone and menthol against Culex pipiens pallens (Diptera: Culicidae)
    FU Lei-Lei, LI Shuang-Yang, HE Jun, MA Zhi-Qing, ZHANG XING
    2016, 59(7):  732-738.  doi:10.16380/j.kcxb.2016.07.005
    Abstract ( 1444 )   PDF (939KB) ( 378 )     
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    【Aim】 In this study, the fumigation and repellent activities of the optical isomers of carvone and menthol were tested against adult Culex pipiens pallens to evaluate their differences in insecticidal activity. It would provide guidance for the utilization of carvone and menthol. 【Methods】 The fumigation and knock-down activities of the five optical isomers of carvone and menthol against 3-day-old female adults of C. pipiens pallens were detected with the Erlenmeyer flask method, Y-tube olfactometer was used to determine the repellent activity, and the single compound with better activity was developed into vaporizing mat for further efficacy assessment. 【Results】 All five isomers had a certain degree of knock-down and fumigation activities against female adults of C. pipiens pallens. Compared with other isomers, L-carvone possessed the highest knock-down activity against female adults of C. pipiens pallens, with the KT50 value of 9.75 min. D-carvone had the highest lethal effect on female adults of C. pipiens pallens, with the LC50 value of 0.26 μL/L. Both L-carvone and D-carvone showed strong repellent activity against female adults of C. pipiens pallens, with the repellent rate of 100% lasting for 30 min at the dose of 0.5 μL. The vaporizing mat with L-carvone as the active ingredient had stronger activity against C. pipiens pallens than that with D-carvone as the active ingredient after heating for 1 h, and their KT50 values were 13.70 and 17.90 min, respectively. 【Conclusion】 Carvone has stronger fumigation activity against female adults of C. pipiens pallens than menthol. The two optical isomers of carvone show a significant difference in fumigation and knock-down toxicities. L-carvone possesses a potential of being developed as a botanical pesticide for the control of C. pipiens pallens.    
    Effects of temperature on the development and reproduction of Acanthoscelides obtectus (Coleoptera: Bruchidae)
    YAO Jie, DAI Ren-Huai, DAI Chuan-Yong, YANG Hong
    2016, 59(7):  739-746.  doi:10.16380/j.kcxb.2016.07.006
    Abstract ( 2010 )   PDF (1012KB) ( 513 )     
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    【Aim】 This study aims to explore the influence of temperature on the development and reproduction of the experimental populations of Acanthoscelides obtectus. 【Methods】 The duration of different developmental stages of A. obtectus were measured at different temperatures (20, 23, 26, 29 and 32℃), the relationship between temperature and developmental stage was fitted using line regression, Logistic model and “Wang-Lan-Ding” model, the developmental threshold temperature and effective accumulated temperature were calculated by using least square method, and the life tables of the experimental populations were established. 【Results】 The duration of various developmental stages of A. obtectus shortened with the rise of temperature, whereas the developmental rate was positively correlated with temperature. For the relationship between developmental rate and temperature, the Logistic model and “Wang-Lan-Ding” model fitted better than the line regression model. The developmental threshold temperature and the effective accumulated temperature for generation were 6.44℃ and 858.22 degree-days, respectively. Fecundity, hatchability and survival rate were the highest at 26℃ (52.71 eggs, 82.67% and 75.67%, respectively), and the lowest at 32℃ (33.20 eggs, 69.33% and 41.67%, respectively). The rm values were 0.05, 0.07, 0.08, 0.09 and 0.08, and the R0 values were 25.54, 33.80, 39.87, 34.52 and 13.86 at 20, 23, 26, 29 and 32℃, respectively. 【Conclusion】 Temperature has a significant effect on the population growth and reproduction of A. obtectus, and the optimum temperature range for its growth and development and reproduction is between 20-29℃.    
    Validity of DNA barcoding in identification of Planococcus minor (Maskell) (Hemiptera: Pseudococcidae), a potential major invasive alien species to China
    WANG Yu-Sheng, ZHOU Pei, TIAN Hu, WAN Fang-Hao, ZHANG Gui-Fen
    2016, 59(7):  747-758.  doi:10.16380/j.kcxb.2016.07.007
    Abstract ( 1462 )   PDF (5076KB) ( 379 )     
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    【Aim】 Mealybugs are one of the most important quarantine pests that injury a variety of tropical fruits and vegetables worldwide. Usually, mealybugs intercepted in the quarantine inspection include eggs, nymphs or debris, and there exist several cryptic species and small difference in related species, which make them difficult to be identified by traditional morphological identification methods correctly and timely. In this study, the validity of DNA barcoding in identification of Planococcus minor (Maskell), a potential major alien invasive species to China, was evaluated. 【Methods】 The 5′- and 3′-end of the mitochondrial cytochrome c oxidase subunit I (COI) gene and 28S ribosomal DNA (rDNA) of 36 individuals of Pl. minor intercepted during passenger inspection were amplified using universal primers, and Pl. citri (Risso), a related species of Pl. minor, from Langfang, Hebei used as a reference. The obtained partial fragment of 5′- and 3′-end of COI gene and D2-D3 fragment of 28S rDNA were sequenced. The phylogenetic tree was established by using a maximum likelihood (ML) method. The intra-and inter-species genetic distances were calculated using the Kimura-2-Parameter model. Meanwhile, the validity of Pl. minor identification based on the above three gene fragments was tested with SpeciesIdentifier software. 【Results】 When the 5′- and 3′-end of COI gene of Pl. minor were sequenced and BLAST, respectively, the nucleotide sequence identity between the fragments from GenBank and our study is 100% and 99%-100%, respectively. The nucleotide sequence identity of the 5′- and 3′-end of COI gene between Pl. minor and Pl. citri is 97%-98% and 96%-98%, respectively. There are 5 and 11 stable species-specific identification sites in the fragments of the 5′- and 3′-end of COI gene for Pl. minor and Pl. citri, respectively. Phylogenetic analysis indicated that Pl. minor intercepted during passenger inspection and those from the NCBI clustered in a clade. The sequencing results showed that the D2-D3 fragment of 28S rDNA among species belonging to the genus Planococcus has high conservation and that it could not be used to distinguish between Pl. minor and Pl. citri. The genetic distance between the two species is 0.004. The results based on the software of SpeciesIdentifier showed that the species identification based on 5′- and 3′-end of COI gene was completely correct, while that based on D2-D3 fragment of 28S rDNA resulted in 45.2%-61.9% of fuzzy identification. 【Conclusion】 Our results suggest that DNA barcoding technique based on 5′- and 3′-end of COI gene can be used to identify and detect Pl. minor rapidly and accurately. The technique will be significant in intercepting and blocking the further spreading of Pl. minor.      
    Progress in functions and underlying signal transduction mechanisms of neuropeptides and their receptors in the silkworm Bombyx mori
    LI Xiao-Tong, SHI Lian-Gen
    2016, 59(7):  759-766.  doi:10.16380/j.kcxb.2016.07.008
    Abstract ( 1547 )   PDF (955KB) ( 678 )     
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     As a class of neuronal signal molecules, neuropeptides are secreted by the neurosecretory cells and play an important role during the communications of different cells. The specific receptor molecules, which are located on the cell surface, are responsible for the localization of neuropeptide molecules and the activation of corresponding intracellular messengers, and eventually trigger a series of cascade reactions. Neuropeptides also have crucial effects on the growth and development of insects, and regulate almost all life activities. As a model species of the Lepidoptera, the silkworm (Bombyx mori) is an important research model for insect development and physiology. Following the completion of the silkworm genome sequencing, more and more neuropeptides and their receptors in this moth have been identified. They were found to deeply influence lots of physiological activities, such as the growth and development, feeding and digestion, molting, diapause, reproduction and cocooning. In this article, we reviewed crucial neuropeptides in the silkworm and their regulation roles in feeding and digestion, molting and metamorphosis, reproduction and development, and other physiological processes. We also discussed the molecular mechanisms that neuropeptides activate the downstream signal transduction pathways, such as ERK and TOR, by binding to their specific receptors. It is expected to provide insights and references for the research of neuropeptides and their receptors in insects, so to advance the research of functional genes of the silkworm and promote the development of silk industry.  
    RAD-seq and its application in entomological research
    WEI Shu-Jun, LI Bing-Yan, CAO Li-Jun, ZHU Jia-Ying
    2016, 59(7):  767-774.  doi:10.16380/j.kcxb.2016.07.009
    Abstract ( 2534 )   PDF (1201KB) ( 635 )     
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    Restriction-site-associated DNA sequencing (RAD-seq) is a technology of reduced-representation genome sequencing (RRGS), which is developed with next-generation sequencing. In terms of RAD-seq, genome is digested by restriction endonuclease. The digested fragments are ligated with barcoded adapters, and used to construct library for sequencing. With the advantages of simple operation, low experimental cost, and high throughput, RAD-seq is widely used in molecular ecology, evolutionary genomics and conservation genetics. Recently, five different RAD-seq methods including mbRAD, ddRAD, 2bRAD, ezRAD and nextRAD have been developed. Of them, mbRAD uses a low frequency cutter and physical shearing to make genome into fragments. ddRAD uses a low frequency cutter and a high frequency cutter to digest genome. 2bRAD relies on IIB-type restriction endonuclease to excise genomic sequences into short fragments. ezRAD uses isochimozer enzymes and Illumina library preparation kit. nextRAD entirely uses Nextera DNA library preparation kit. In this article, we reviewed the characteristics of each RAD-seq method and its application in entomology, such as population genetics, community ecology, species delimitation, phylogenetic reconstruction and construction of genetic linkage map.    
    Synergistic effects of Varroa destructor and Deformed wing virus on honey bee health
    LIN Zhe-Guang, QIN Yao, LI LI, WANG Shuai, ZHENG Huo-Qing, HU Fu-Liang
    2016, 59(7):  775-784.  doi:10.16380/j.kcxb.2016.07.010
    Abstract ( 1676 )   PDF (986KB) ( 477 )     
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    The elevated global colony losses of the Western honey bee, Apis mellifera, have drawn much attention in beekeeping and scientific communities. The ectoparasite Varroa destructor and Deformed wing virus (DWV) are regarded as the two key biotic threats to colony health. Irrespective of the long-time existence in colonies, their synergistic impacts on honey bee health, which are far more severe than the harms caused by separate individuals, were not intensively studied until the recent decade. These synergistic effects include: (1) DWV replicates on V. destructor and transmits with the mites; (2) DWV can be directly transmitted into host hemolymph through mite feeding; (3) Highly virulent strains of DWV bias proliferation in A. mellifera populations with the co-occurrence of Varroa infestation; (4) V. destructor affects honey bee’s immunity and development, resulting in the impairment of host defence to viruses; (5) DWV-induced immunosuppression in hosts favors mite feeding and reproduction. The complex relationships among V. destructor, DWV and A. mellifera have become a typical model in the study of parasite-pathogen-host interactions. By summarizing the relevant researches in this field over the last decade, we aim to provide insights for further studies on colony losses and parasite-pathogen-host interactions.  
    Evaluation of varietal resistance of commercial sugarcane varieties to stalk borers, Sesamia spp. (Lepidoptera: Noctuidae), under field conditions (In English)
    Amin NIKPAY
    2016, 59(7):  785-790.  doi:10.16380/j.kcxb.2016.07.011
    Abstract ( 1207 )   PDF (3924KB) ( 354 )     
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    【Aim】 The pink stalk borers, Sesamia spp., are the most destructive pests of sugarcane, Saccharum spp., in Iran and other countries including India, Pakistan, Sri Lanka and Japan. The larvae of Sesamia bore into the stalk and cause damage to stalks by reducing weight and sugar content as well as juice quality. For management of stalk borers, several control options are used. Using resistant varieties is an effective tool which has no harmful impact on environment. This study aims to evaluate the resistance of commercial varieties to stalk borers. 【Methods】 The trials were conducted following a randomized block design with five replications in two successive years 2013-2014 and 2014-2015 at Salman-Farsi Agro-industry Farms, Ahwaz, Iran. The eight varieties CP69-1062, CP48-103, CP57-614, CP73-21, SP70-1143, IRC99-01, IRC99-02 and L62-96 were used. Prior to harvest, 20 whole stalks were randomly collected for Sesamia spp. damage assessments. Percent of stalks damaged, percent of internodes bored (IB), number of exit holes, number of live Sesamia spp. and moth production (MP) per hectare of each variety were recorded. 【Results】 There were significant differences in measured parameters among cultivars. Based on the percent of internodes bored and moth production index, L62-96 was the most susceptible variety among the tested varieties (14.58% IB, 95 200 MP/ha in 2014 and 16.76% IB and 111 300 MP/ha in 2015) followed by CP69-1062 and CP48-103, and CP57-614 was the most resistant cultivar in both years (1.24% IB, 8 400 MP/ha in 2014 and 1.02% IB, 7 000 MP/ha in 2015). 【Conclusion】 We proposed that cultivation of susceptible cultivars should be confined and other control strategies must be incorporated with varietal resistance for management of stalk borers in susceptible varieties.  
    Relationship between population dynamics and gall development of the gall aphid Kaburagia rhusicola (Hemiptera: Aphididae)
    CHA Yu-Ping, YANG Zi-Xiang, CHEN Jing-Yuan, CAI San-Shan
    2016, 59(7):  791-796.  doi:10.16380/j.kcxb.2016.07.012
    Abstract ( 1423 )   PDF (1170KB) ( 459 )     
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    【Aim】 The relationship between population dynamics and gall development of the gall aphid Kaburagia rhusicola was investigated in order to provide a basis for further studying its biological characteristics. 【Methods】 Thirty gall samples induced by the aphid K. rhusicola were collected from its host trees in the field in Zhushan, Hubei every 10 days during gall growth period, from April 27 to July 16, 2014. Gall volume was measured by the drainage method. Each gall was dissected, all aphids were put in a petri dish, and then the number of aphid individuals was counted by the quartering method. The correlation relationship between the growth of gall volume and the change of aphid clonal population inside the gall was analyzed. 【Results】 There was a significantly positive correlation between the gall volume and the number of aphids (r=0.960, P<0.01). Both of the gall volume and the number of aphids had three peaks, which appeared on May 6 to May 16, May 26 to June 6, and June 26 to July 6, respectively. The aphid density in gall declined at the beginning and then rose, with a slight fluctuation in the intermediate stage. 【Conclusion】 This study demonstrates that gall volume is positively correlated with the number of aphids inside the gall. Gall volume can be used as an indicator for fitness of the aphid stem mother to the external environment.  
    Phototaxis of Sitodiplosis mosellana (Diptera: Cecidomyiidae) adults to linearly polarized light
    JIANG Yue-Li, LI Tong, GONG Zhong-Jun, DUAN Yun, MIAO Jin, WU Yu-Qing
    2016, 59(7):  797-800.  doi:10.16380/j.kcxb.2016.07.013
    Abstract ( 1349 )   PDF (2233KB) ( 282 )     
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    【Aim】 This study aims to explore the phototaxis of Sitodiplosis mosellana adults to linearly polarized light. 【Methods】 The phototatic rate of S. mosellana adults to the linearly polarized and unpolarized light was tested with a self-designed Y-tube device in the laboratory. Field tests were also carried out to compare the numbers of S. mosellana adults trapped by the linearly polarized and unpolarized UV light traps. 【Results】 The results showed that the phototatic rates of S. mosellana adults to linearly polarized and unpolarized light were 47.23% and 20.31%, respectively, with obvious difference between them. The highest number of S. mosellana adults (60.20) was trapped by horizontally linearly polarized light, and then by vertical linearly polarized light (37.60) and by unpolarized light (25.60), and there was obvious difference between the numbers of adults trapped by horizontally linearly polarized light and by unpolarized light. 【Conclusion】 The preference of S. mosellana to linearly polarized light is stronger than to unpolarized light. Horizontally linearly polarized UV light shows significantly higher trapping efficiency to S. mosellana than unpolarized light.  
    Contents of Vol. 59 Issue 7
    2016, 59(7):  801-801. 
    Abstract ( 1002 )   PDF (441KB) ( 259 )     
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