Applied Entomology and Zoology
Online ISSN : 1347-605X
Print ISSN : 0003-6862
ISSN-L : 0003-6862
44 巻, 4 号
選択された号の論文の27件中1~27を表示しています
Regular Papers
  • Hideharu Tsukagoshi, Yasutomo Higashiura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 491-496
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    We investigated the effect of temperature on the developmental and survival rates in the life stages of the Okinawan gypsy moth, Lymantria albescens, and the casuarina tussock moth L. xylina, from Okinawa, Japan. Under laboratory conditions at constant temperatures of 17.5, 20.0, 22.5, 25.0, 27.5 and 30.0°C, the thermal threshold and thermal constant from larva to adult for L. albescens and L. xylina were 9.1–9.9 and 8.4–11.0°C and 780.8–872.2 and 731.8–1,053.8 degree-days, respectively. Last-instar larvae of males of both species were mostly 6th instars, whereas a large number of female last-instar larvae were 6th and 7th instars. Survival rates of L. albescens and L. xylina were very low at 30.0°C, indicating that these species in Okinawa are not resistant to temperatures higher than 30°C. Our results provide information for predicting the appearance of field populations of L. albescens and L. xylina in Okinawa.
  • Toshihiro Imai, Masashi Mizutani, Masayasu Tanaka
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 497-500
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The principal insecticidal compound obtained from the herbal medicine Inchinkō, the dry flower buds of Artemisia capillaris (Asteraceae), which works against the cigarette beetle, Lasioderma serricorne, was isolated through successive silica-gel column chromatography and HPLC. The active isolate was characterized as capillin (1-phenyl-2,4-hexadiyn-1-one) by FT-IR, GC/MS, and 1H- and 13C-NMR analyses. The LC50 and LC99 of the isolated capillin against the larva of L. serricorne were 130 ppm and 415 ppm, respectively. The commercial extract of A. capillaris (rumput roman extract; capillin content, 1.8%), which has been approved as a natural preservative for food, may be applicable as a safe insecticidal agent to control the cigarette beetle.
  • Tatsuo Yabe, Osamu Arakawa
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 501-504
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    We established a standard curve for age estimation of the Japanese grass vole, Microtus montebelli, from eye-lens weight as a tool for analyses of ages in the vole population. Predicted age was given by the equations, x=10(Y+2.00)/3.24 for males, and x=10(Y+1.72)/2.94 for females, where Y is weight of paired lenses in mg and x is predicted age in days. Indices of predictive accuracy of the technique (Syx/Y: the standard error of estimate divided by the mean of Y) were 0.059 and 0.073 for males and females, respectively.
  • Kiyohisa Kawamura, Suguru Ohno, Dai Haraguchi, Shunji Kawashima, Tsugu ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 505-513
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    To use elytral color morphs of Cylas formicarius as a genetic marker in its eradication using the sterile insect technique, the geographic distribution of the morphs was examined in the three main infested areas of Japan (Central Ryukyus, Southern Ryukyus, and Ogasawara Islands). In addition to the two known color morphs in Japan (bluish elytra (BE) and greenish elytra (GE)), the piceous elytra (PE) was found mainly in the Southern Ryukyus at low frequency. The color morph frequencies varied between the Central and Southern Ryukyus and between locations within the two areas, while only BE was found in the Ogasawara Islands. PE would be useful for genetically marking sterile weevils to be released. Similarly, GE would be useful in some islands where GE is rarely or not found. BE frequencies on two islands in the Central Ryukyus (Amami and Okinawa) and two islands in the Southern Ryukyus (Miyako and Ishigaki) in 2006–2007 were higher than in 2002–2003.
  • Hunsung Kim, Sunghoon Baek, Sejin Kim, Soo-Yeon Lee, Joon-Ho Lee
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 515-523
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The temperature-dependent development, survival, longevity, and reproduction of Riptortus clavatus (Thunberg) (Hemiptera: Alydidae) were studied at constant temperatures in the laboratory. The mean developmental time from egg to adult emergence ranged from 18.8 d at 36.7°C to 67.0 d at 19.7°C and the lower temperature threshold for the total immature stage (egg to adult emergence) was 15.0°C. The nonlinear shape of temperature-dependent development was well described by the Lactin model. The standardized cumulative frequency distributions of developmental times for each life stage were fitted to the two-parameter Weibull function. Mean adult longevity ranged from 7.83 d at 34°C to 165.14 d at 17.5°C. Mean total fecundity ranged from 29.2 eggs at 34°C to 456.4 eggs at 25°C and was fitted to the extreme value function. Adult survival and the cumulative oviposition rate of R. clavatus were fitted to the sigmoid and two-parameter Weibull function, respectively. We anticipate that the fitted models and parameters will be useful in developing a population model for R. clavatus.
  • Hirosato Konishi, Hiroaki Noda, Yasumori Tamura, Makoto Hattori
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 525-534
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The rice brown planthopper, Nilaparvata lugens is a phloem-feeding insect pest of the rice plant Oryza sativa. To understand the role of saliva in its feeding process, we analyzed salivary gland proteins using two-dimensional polyacrylamide gel electrophoresis followed by Edman degradation of proteins. Of the 52 major spots analyzed, 25 N-terminal sequences were determined. The internal amino acid sequences of the remaining 27 proteins were determined by the Cleveland peptide mapping method. We identified 22 of the 25 proteins whose N-terminal regions were sequenced and 13 of the 27 proteins that were internally sequenced after searching them against the entries in the expressed sequence tag (EST) database of N. lugens. Through a homology search using public nonredundant protein databases, we identified EST-unmatched proteins. As a result, many housekeeping proteins responsible for energy metabolism, protein synthesis, folding and modification were identified, of which actins, tubulins, heat-shock proteins, protein disulfide isomerases and ATP synthases were in common with proteins identified from the salivary glands of hematophagous arthropods such as Anopheles gambiae, and a phytophagous gall midge Mayetiola destructor. However, we could not identify the glucosidases and phenoloxidases previously detected in the salivary glands of N. lugens. In contrast, novel proteins with an EF-hand domain were found in relatively high abundance in salivary gland homogenates derived from N. lugens; their corresponding ESTs were specifically derived from the salivary glands. Their calcium-binding properties suggest their importance of phloem feeding by the planthopper.
  • Andrew P. Davies, Kenji Takashino, Masaya Watanabe, Kazuki Miura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 535-541
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The effects of natural enemy releases on conservation genetics within ecosystems are rarely considered. Diadegma semiclausum (Hellen) (Hymenoptera: Ichneumonidae) was introduced and continues to be released for biological control of diamondback moth in Japan. Diadegma semiclausum and indigenous Diadegma fenestrale (Holmgren) (Hymenoptera: Ichneumonidae) share geographic ranges and hosts, and produce offspring when mated under laboratory conditions. We used DNA to examine whether offspring from inter-specific one-way parental crosses (D. semiclausum ♀ and D. fenestrale ♂) were hybrid, as some Hymenoptera (e.g. Aphidius colemani Viereck (Hymenoptera: Braconidae)) exhibit thelytokous reproduction by gynogenesis. Molecular analyses revealed offspring mtDNA (COI) is maternally inherited, as expected, but rRNA (ITS-2) originates from both parents. Should similar hybridization occur in the field beyond the F1 generation, genetic mixing is a possible consequence that may influence biological control efficacy or pollute native population genetics.
  • Shanfeng Ling, Jie Zhang, Liangxiong Hu, Runjie Zhang
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 543-548
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Applications of fipronil (1.25×10−2 μg) and fipronil (7.50×10−3 μg) significantly stimulated the fecundity of Nilaparvata lugens compared with the control. The stimulating effect of fipronil on fecundity was dose-dependent. Fifteen and 30 days after treatment, the quantity of honeydew significantly increased in 1.25×10−2 μg fipronil treatment. Fifteen days after treatment, the effect of fipronil on the quantity of honeydew was dose-dependent. The results revealed that the fipronil treatment group had developmental advantages. Selection with 25 mg/l fipronil led to a continuous increase in the resistance ratio (from 1.0 to 30.05) in eight generations. The life table indicated that the resistant strain had obvious disadvantages, including decreasing the survival rate from 3rd to 5th instar in G8 generation and decreasing fecundity in G5 generation. Compared with the susceptible strain, resistant insects had a relative fitness of only 0.577 and 0.750. The lower fitness includes a lower larval survival rate from 3rd to 5th instar (in G8 generation), lower adult emergence rate (in G8 generation), lower copulation rate (in G8 generation), lower fecundity (in G5 generation) and fewer offspring. It was concluded that the brown planthopper had the potential to develop high resistance to fipronil but that the lower fitness of resistant hoppers could result in quick recovery of sensitivity when the population did not come into contact with fipronil. This means that a reasonable resistance management program with less fipronil use may efficiently delay or even stop resistance development.
  • Masaaki Ito, Hisashi Kajimura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 549-559
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    We examined the genetic structure of populations of an ambrosia beetle, Xylosandrus crassiusculus. Specimens were collected from 22 sites in Japan and their genetic structure was studied using a portion of the mitochondrial cytochrome oxidase I gene. Phylogenetic analysis revealed three distinct lineages (clades A, B and C), each of which was divided into two subclades (A1, A2, B1, B2, C1 and C2). Subclade A1 had 17 haplotypes from Hokkaido, Honshu and Kyushu populations, subclade A2 5 haplotypes mainly from Shikoku populations, subclade B1 15 haplotypes from central and western Honshu and Amami populations, subclade B2 2 haplotypes only from Naha population, subclade C1 4 haplotypes from Amami and Naha populations, and subclade C2 5 haplotypes only from Ishigaki population. Analysis of molecular variance detected genetic differentiation among populations. The data imply that the genetic structure of Japanese populations of X. crassiusculus has been affected by the geological history of the Japanese islands, but that the mtDNA phylogeographic pattern is so complex that we could not infer any simple scenario of population history in X. crassiusculus.
  • Norio Arakaki, Yasuhiro Hokama, Kohji Yamamura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 561-568
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Bait trap efficiencies were compared to construct a sampling method for wireworms, larvae of the click beetle Melanotus okinawensis (Coleoptera: Elateridae). Various combinations of bait material, bait preparation methods, and bait exposure periods were compared. Wireworms were more efficiently attracted by germinating rice seeds than other bait materials, such as sweet potato, potato, and carrot. Among the bait materials related to rice, germinating rice seeds attracted significantly more wireworms than other materials, such as unpolished rice, polished rice, rice seeds, and rice husks. Rice bran and germinating unpolished rice were lesser attractants than germinating rice seeds. Attractiveness increased only slightly with increasing periods of incubation of rice seeds. Attractiveness increased more slowly with the increase of rice seeds, indicating that 30 g was sufficient for attraction. The number of captured wireworms increased with increasing periods of field exposure, but we judged that three days of exposure might be an appropriate choice because the difficulty of handling traps increased with increasing periods of exposure. Under semiarid soil conditions, bait attractiveness was greatly enhanced by daily irrigation. It was shown that germinating rice seeds with moistened sphagnum moss are as effective as germinating rice seeds with daily irrigation.
  • Jung-Joon Park, Doo Hyung Lee, Key-Il Shin, Joon-Ho Lee, Kijong Cho
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 569-577
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    In this study, we examined the spatial dynamics of the western flower thrips, Frankliniella occidentalis Pergande (Thysanoptera: Thripidae). Adult and immature F. occidentalis were sampled weekly from two cucumber greenhouses on Jeju Island, Korea, from May to July in both 2003 and 2004. Spatio-temporal dynamics of immature and adult F. occidentalis were analyzed and compared based on the Green's index, Taylor's power law (TPL) and spatial analysis of distance indices (SADIE). Based on the dispersion indices determined from the TPL and Green's, thrips were found to be aggregated in both greenhouses. The degree of aggregation differed significantly between adult and immature thrips according to the TPL. The SADIE index of aggregation and association probability were estimated and compared between stages and between sampling times. The aggregation values (Ia) for adults and immatures at most sampling points were indicative of a inconsistent pattern of aggregation. There were substantial spatial associations (10 out of 14 cases) between adults and immatures each week; however, the temporal stability of the spatial patterns of adults and immatures decreased over time. The spatial patterns of F. occidentalis and their associations presented here provide the baseline information necessary to understand and predict plant damage and thrips dynamics in greenhouse environments.
  • Sadao Wakamura, Hiroe Yasui, Fumiaki Mochizuki, Takehiko Fukumoto, Nor ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 579-586
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Polyethylene tube formulation was developed for the highly volatile sex pheromone of the white grub beetle Dasylepida ishigakiensis, a serious sugarcane pest that appears above the ground for mating during a short period on Miyako Island, Okinawa, Japan. A polyethylene tube 1 cm long containing 12 mg (R)-2-butanol was found to be one of the most effective formulations for attracting and capturing male beetles when baited in a funnel trap in the field. Its attractiveness was comparable to that of a caged virgin female. Similarly prepared tubes containing (S)-2-butanol and 2-propanol showed no attractiveness. As for the enantiomeric purity of (R)-2-butanol, blending 10% or less (S)-2-butanol did not affect attractiveness, whereas no male beetles were captured with the racemic mixture. Blending (R)-2-butanol with 2-propanol in a ratio of 1 : 2 or less showed neither a synergistic nor inhibitory effect on beetle catches in the field, while the release rate of 2-propanol from the tube was approximately 50–60% of that of 2-butanol. A tube lure containing 12 mg (R)-2-butanol released ca. 50 ng of this compound per min at 20°C in the laboratory. This led to the estimation that the effective duration of this lure (>5 months) would be sufficient to cover the entire flight season of D. ishigakiensis beetles.
  • Tomokazu Seko, Kazuki Miura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 587-594
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The effects of artificial selection for reduced flight ability on the survival rate and fecundity of the ladybird beetle Harmonia axyridis were assessed. The hatching rate, emergence rate and fecundity of the flightless strain were significantly lower than the control in the 36th generation after artificial selection was started under laboratory conditions. In greenhouses containing cultivated eggplant in which the flightless strain was released, the incidence of fourth instar larvae, i.e., offspring of released adults, was delayed for 7 days compared with the control and commercial strain. These results suggest that artificial selection for reduced flight ability reduces the survival and reproductive characteristics of H. axyridis.
  • Kotaro Konno, Chikara Hirayama, Hiroshi Shinbo, Masatoshi Nakamura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 595-601
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The leaves of the privet tree, Ligustrum obtusifolium (Oleaceae), retain a strong lysine-decreasing activity caused by enzymatically-activated oleuropein, an iridoid glycoside. Protein treated with this activity become innutritive to insects because of the loss of lysine. We previously found that several privet specialist caterpillars secrete high concentrations of glycine in their digestive juices. Previous in vitro experiments showed that glycine inhibits lysine-decreasing activity of oleuropein. Therefore, we hypothesized that the lysine-decreasing activity acts to defend privet tree against herbivores and that glycine secretion by insects is an adaptive trait to counter the privet defense. In the present study, we aimed to examine whether these assumptions hold true under physiological conditions, and performed in vivo bioassays and physiological analyses using the Eri silkworm, Samia ricini (Saturniidae), a non-privet specialist. Significant decreases in larval growth and lysine concentration in the midgut lumen were observed when larvae were fed intact privet leaves compared to when they were fed heat inactivated privet leaves. These decreases were inhibited when larvae were fed intact privet leaves together with glycine, indicating that the privet defense with oleuropein and the specialist adaptation with glycine do function under physiological conditions. This study thus provides a rare view into the detailed physiological impacts of anti-nutritive plant defense and insect physiological adaptation in vivo.
  • Shin G. Goto, Hideharu Numata
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 603-609
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Using a water treatment technique that extends the larval period of flesh flies, we investigated the effect of photoperiodic exposure on the alteration of the pupal diapause program and regulation of larval duration in the flesh fly Sarcophaga similis Meade (Diptera: Sarcophagidae). Exposure to only 4 cycles of long days successfully altered the developmental program from diapause to nondiapause, and short days altered the nondiapause developmental program to a diapause program. Larvae recognized all photoperiods of 14L10D, 15L9D, and 16L8D as long days, but their diapause-averting effects were different, i.e., 16L8D showed the strongest effect, 14L10D showed the weakest, and 15L9D showed an intermediate effect. These results indicate that larvae can discriminate long days quantitatively. S. similis also showed a clear photoperiodic response in the larval stage, i.e., larvae reared under short-day conditions pupariated later than those reared under long-day conditions. When diapause-destined larvae were exposed to 3 cycles of long days, some larvae altered their developmental program from diapause to nondiapause and pupariated significantly earlier than individuals destined to diapause.
  • Tetsuya Yasuda, Keiko Oku, Hiroya Higuchi, Shinji Shigehisa, Yasuyo Ok ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 611-619
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Three components, hexyl butyrate (=butanoate) (6:nBu), (E)-4-oxohex-2-enal (E2O4-6:Ald) and (E)-hex-2-en-1-yl butyrate (E2-6:nBu), were identified as sex attractant pheromone components of the sorghum plant bug Stenotus rubrovittatus (Matsumura) (Heteroptera: Miridae) in a previous study. The optimum ratio and amount of the three components loaded into rubber septa for male attraction were investigated. A 5:10:1 blend of 6:nBu, E2O4-6:Ald and E2-6:nBu at 64 μg per rubber septum was most effective for male attraction and regarded as an ‘optimized blend’. The attractiveness of the optimized blend lures did not differ between lures with and without a sunshade and was equal to that of 10 unmated females. The attractiveness of optimized blend lures after weathering for 14 d did not differ from fresh lures, whereas the attractiveness of optimized blend lures weathered for more than 21 d was lower than fresh lures. Female extracts of S. rubrovittatus contain 13 minor components; however, the attractiveness of lures impregnated with female extracts did not differ from optimized blend lures. This result suggests that minor components at the amounts contained in the female extract do not strongly enhance its attractiveness.
  • Norio Arakaki, Yukio Shimoji, Sadao Wakamura
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 621-625
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    Adults of cupreous polished chafer Protaetia pryeri pryeri (Janson) (Coleoptera: Scarabaeidae) were attracted by and landed on cotton balls treated with commercially available pet deodorant spray or a topical antipruritic for human skin. When volatiles from the spray and antipruritic were extracted by solid phase microextraction (SPME) and analyzed by GC-MS, camphor was found as a common compound. This compound was not detected in the volatiles of two other commercially available deodorant sprays, neither of which attracted chafers. In the field, P. p. pryeri were attracted to cotton balls treated with 63 μg to 4 mg (1R)-camphor but not to untreated balls. This demonstrated that (1R)-camphor is an attractant for P. p. pryeri. The adaptive significance of the response to camphor by P. p. pryeri is discussed.
  • Suguru Ohno, Akiko Miyagi, Tomoko Ganaha-Kikumura, Tetsuo Gotoh, Yasuk ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 627-633
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    On the main islands of Japan and in Taiwan, the spider mites Tetranychus kanzawai and T. urticae (green and red forms) are major pests on vegetable crops. The present study revealed that the dominant spider mite species injurious to vegetables in Okinawa, located between the main islands of Japan and Taiwan, differed from those in the two regions, providing important and fundamental information for controlling spider mites in Okinawa. T. okinawanus was the most dominant species throughout Okinawa with the broadest host range, even though the species has been regarded as a non-pest to date. T. piercei, which has similarly not been treated as a vegetable pest, was the second most dominant species with respect to frequency of occurrence and host range. T. kanzawai and T. urticae (green form) were comparable in the frequency of occurrence to T. piercei in the northern part of Okinawa (Okinawa Islands), whereas they were scarce in the southern part (Sakishima Islands). As other less-dominant species, T. ludeni, T. neocaledonicus and T. pueraricola were found infesting several vegetable crops. T. urticae (red form) was not found in this study.
  • Norihide Hinomoto, Tomomi Higaki, Takashi Noda
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 635-642
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    We developed 14 polymorphic microsatellite markers for the minute pirate bug Orius sauteri (Heteroptera: Anthocoridae), and tested them with five markers previously developed in O. strigicollis. Except at one locus from O. strigicollis, we obtained amplified fragments from a field population of O. sauteri. The number of alleles ranged from 2 to 14, and observed heterozygosity ranging from 0.000 to 0.900. The observed heterogeneity was negatively correlated with null allele frequencies. Linkage disequilibrium was detected in three pairs of loci. The 19 microsatellite loci were also tested for amplification and polymorphism in two congeneric species, O. minutus and O. strigicollis. Markers could be amplified at many loci, although null allele frequencies were higher in cross-species amplification than in intra-specific amplification. These microsatellite markers will be used in studies of genetic diversity in these species.
  • Suguru Ohno, Yu Tamura, Dai Haraguchi, Takashi Matsuyama, Tsuguo Koham ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 643-654
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    The re-invasion of Okinawa by the Bactrocera dorsalis complex (oriental fruit fly and its relatives) after its eradication was comprehensively documented for the first time. From 1987 to 2008, more than 300 adult flies were captured by monitoring traps baited with methyl eugenol, showing frequent re-invasion. During this period, re-colonization (detection of infested fruits) occurred six times; in all cases the flies were successfully re-eradicated by countermeasures (mainly male annihilation method). This indicates that the oriental fruit fly problem in Japan has not been resolved and that the flies should be monitored and counteracted continuously. By summarizing the re-invasion data, we found interesting geographical patterns. Adults were more frequently trapped in the southern area (Sakishima Islands, SI), while colonization occurred more frequently in the northern area (Okinawa Islands, OI). Annual trap catches increased in SI, but not in OI. In SI, adults were trapped most frequently in summer, whereas peak catches in OI were observed in autumn. These results demonstrate that the invasion pattern in OI is independent from that in SI. One possible explanation for the observed geographical differences is that it reflects the difference in invasion causes.
  • Junichi Yukawa, Shinsuke Sato, Keith M. Harris, Makoto Tokuda, Masatak ...
    原稿種別: Regular Paper
    2009 年 44 巻 4 号 p. 655-666
    発行日: 2009/11/25
    公開日: 2009/12/16
    ジャーナル フリー
    In 2003, gall midge larvae of the genus Resseliella (Diptera: Cecidomyiidae) were found infesting the cores of Japanese pear, Pyrus pyrifolia (Rosaceae), in Fukushima Prefecture, Japan. Symptoms of infestation are similar to those noted previously for Japanese pear in Japan and Korea. From 2007 to 2008, gall midge larvae that were similar to those found in Fukushima Prefecture were detected in Tottori and Shimane Prefectures, Japan under the bark of Japanese pear. Based on morphological comparison with known congeners associated particularly with Rosaceae in the Palaearctic region and those occurring in Japan, we concluded that the gall midge infesting Japanese pear is a new species of Resseliella. DNA sequencing data also supported this conclusion. This new species seems to be identical to the ‘pear codlin midge’ reported previously from Japan and Korea. We describe the gall midge as Resseliella yagoi sp. nov. and provide information on host plant cultivars, distribution, behavioral and life history traits, and pest status.
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