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Fumihiko SUZUKI, Takayuki MITSUNAGA, Taketo ASHIZAWA
2017 Volume 2017 Issue 64 Pages
6-9
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Kazuhiko SAKAI, Tsuneo UETAKE, Ryousuke OMATA
2017 Volume 2017 Issue 64 Pages
10-14
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Yasuhiro INOUE, Hiroshi UEMATSU
2017 Volume 2017 Issue 64 Pages
15-17
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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An inoculation method for confirming the pathogenicity of Pseudomonas syringae pv. japonica (synonym pv. syringae), causal agent of bacterial black node of barley and wheat was developed. The plants at flag leaf stage were each placed at 20-25 ℃ for about five hours in a dark container, then 10 µl bacterial suspension was dropped on the auricle at several points in time around the stage. The inoculated plants were placed at 20-25 ℃ for three days in a dark container and then placed for one week with appropriate light and humidity. The infection frequency by this inoculation method was the highest on the plants inoculated during flag leaf expansion stage, while it decreased when the plants were inoculated at the beginning of heading stage. When plants of 14 cultivars of wheat and 11 cultivars of barley were each inoculated with the pathogen during flag leaf expansion stage, disease symptoms were formed on all the cultivars. These results suggested that wheat and barley were more susceptible to bacterial black node pathogen during flag leaf expansion stage irrespective of cultivar type. The disease mainly occurred on the leaf sheath as withering with black lesions forming under the inoculated point, but several plants also showed black lesions on the stem, followed by stem breaking, as well as ear burn. These symptoms are identical with those found in the field, indicating that bacterial black node disease can be reproduced by the inoculation method.
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Youhei KANEKO, Tomoko YOKOYAMA, Nakako NAKATA, Masanobu FUKAMI, Koushi ...
2017 Volume 2017 Issue 64 Pages
18-22
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Koshi NAKAMURA, Tomoko YOKOYAMA, Kenji SUZUKI, Nobuhiko FUKUCHI
2017 Volume 2017 Issue 64 Pages
23-26
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Chizuko KAGEYAMA, Makoto DOI, Kazuo MATSUNO
2017 Volume 2017 Issue 64 Pages
27-29
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Yoshiko NAKAZAWA, Shinya KEBUKAWA
2017 Volume 2017 Issue 64 Pages
30-32
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Shuichiro YAMAZAKI, Jyunichi TAKANO, Masaji MORISHIMA, Miyako YAMASHIR ...
2017 Volume 2017 Issue 64 Pages
33-34
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Masaharu KUBOTA, Mikio KUSUNOKI
2017 Volume 2017 Issue 64 Pages
35-38
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Broccoli plug seedlings in Kagawa Prefecture, Japan, in 2014 and 2015, wilted and damped-off. A microorganism was isolated from stems of the diseased plants and identified as Pythium megalacanthum by morphological and molecular phylogenetic analysis. When the microorganism was inoculated onto broccoli plug seedlings, it produced identical symptoms to the original infection and the microorganism inoculated was re-isolated from the diseased plants. Thus, the causative pathogen was identified as P. megalacanthum. This is the first report of broccoli disease caused by this microorganism in Japan.
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Norihito YAMAUCHI, Kazuhiko SAKAI, Takashi SHIRAKAWA
2017 Volume 2017 Issue 64 Pages
39-40
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Spinach cultivars reaction to Peronospora farinosa f. sp. spinaciae isolate SAI-2, suspended race numbering, obtained from Saitama Prefecture, Japan in 2010 were studied. It was suggested that commercial cultivars resistant to race 8 had also potential for resistance against the pathogenic strain involving isolate SAI-2.
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Tokiya SHIMIZU, Kuniatsu KUWASAWA, Tsuyoshi SATO, Norihito YAMAUCHI, H ...
2017 Volume 2017 Issue 64 Pages
41-46
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Norihito YAMAUCHI, Mamoru SATOU
2017 Volume 2017 Issue 64 Pages
47-49
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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In April 2015, irregularly and yellowing lesions on the leaves of shepherd’s purse (Capsella bursa-pastoris) were found in an outdoor field in the south area of Ibaraki Prefecture. White and powdery stigmata of this pathogen were observed on the lesions. The pathogen of this disease was identified as Hyaloperonospora parasitica based on the morphological features of conidia and conidiophores, host range and the sequence of ribosomal DNA internal transcribed spacer (rDNA-ITS) region.
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Youhei KANEKO, Akihiro YOSHIDA, Takeshi SUZUKI, Hiroshi FUKUDA
2017 Volume 2017 Issue 64 Pages
50-54
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Maho TAKAHASHI, Tatsuya SUZUKI, Masanobu FUKAMI
2017 Volume 2017 Issue 64 Pages
55-58
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Kota TANAKA, Kouki OHTA, SUGIYAMA Chisato, Eiichi KUROYANAGI, Mizue TS ...
2017 Volume 2017 Issue 64 Pages
59-62
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Mamoru SATOU, Norihito YAMAUCHI
2017 Volume 2017 Issue 64 Pages
63-64
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Mamoru SATOU, Yoshiaki CHIKUO, Yosuke MATSUSHITA
2017 Volume 2017 Issue 64 Pages
65-67
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Mitsuru OKUDA
2017 Volume 2017 Issue 64 Pages
68-72
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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To develop an assay using reverse transcription polymerase chain reaction (RT-PCR) to detect multiple species of viruses in the Tospovirus genus, six primer pairs were chosen from those previously reported and tested to determine if RT-PCR with these primers could detect 8 species occurring in Japan. Consequently, two primer sets, gL2740/gL3920 or t2740/t3920c could detect all species occurring in Japan. The nucleotide residues of t2740 and t3920c were modified to correspond with each of the target sequences of 19 species reported outside Japan, except Groundnut chlorotic fan-spot virus. RT-PCR with the modified primer pair resulted in detecting the 8 species occurring in Japan, and was expected to be available for multiple species in the Tospovirus genus.
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Nobuko SUWA, Mai KITAMURA, Satomi NISHIMIYA
2017 Volume 2017 Issue 64 Pages
73-76
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Masahiro HIRAE, Takuya SHIBA
2017 Volume 2017 Issue 64 Pages
77-79
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Hiroshi OIDA, Nozomu KIUCHI
2017 Volume 2017 Issue 64 Pages
80-83
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Abstract We investigated the effectiveness of augmentation of the mirid bug Nesidiocoris tenuis (Reuter) against the greenhouse whitefly Trialeurodes vaporariorum (Westwood) on tomatoes in greenhouses by pre-plant or post plant releases. In trial 1, the tomatoes were transplanted in May 2014, and the bugs were released three times after transplanting at weekly intervals with a density of 0.5 bugs per plant. In trials 2 and 3, the bugs were released two times before transplanting at weekly intervals with a density of 0.5 bugs per plant in August 2014 or in May 2015. In each trial, N. tenuis colonized the tomato plants. The density of whitefly on tomatoes was significantly lower in the bug-released greenhouse (Repeated measures of ANOVA, p < 0.0001) than in the non-released greenhouse. Nesidiocoris tenuis did not cause economic damage to tomato. These results indicate that pre-plant or post-plant releases of N. tenuis are effective for controlling T. vaporariorum on tomatoes in greenhouses.
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Hiroshi OIDA, Haruhisa ISHIKAWA, Masashi NAYUKI
2017 Volume 2017 Issue 64 Pages
84-85
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Abstract We investigated the population dynamics of Nesidiocoris tenuis (Reuter) and recorded species of other insects observed on sesame in 2014 and 2015 in Chiba Prefecture, Japan. Nesidiocoris tenuis adults and nymphs occurred during or after the second half of August until the end of October or plant death. We observed one lepidopteran pest and four hemipteran species (except N. tenuis) including three pest species of some crops. These results indicated that sesame plants are potentially useful for collecting N. tenuis in a field in Chiba Prefecture. However, we should pay attention to occurrence of insect pests.
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Shizue MIKI
2017 Volume 2017 Issue 64 Pages
86-93
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Kouichi OYAMADA
2017 Volume 2017 Issue 64 Pages
94-97
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Makoto KOBAYASHI, Hiroshi NISHIMURA, Kouichi OYAMADA
2017 Volume 2017 Issue 64 Pages
98-103
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Koukichi NAGASAKA
2017 Volume 2017 Issue 64 Pages
104-108
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Ryozaburo IWASE, Wataru ASANO, Ryosuke OMATA
2017 Volume 2017 Issue 64 Pages
109-112
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Abstract A new pest, Welsh onion root darkwinged fungus gnat (tentative name) (Bradysia sp.) injurious to Welsh onion in fall and winter, and carrot in spring in the northern part of Saitama Prefecture, its distribution on parasitized Welsh onion plants and susceptibility to insecticides were investigated. Welsh onion was primarily parasitized by larvae at the stem plate, but the number of larvae increased at the leaf sheath covered with soil increased by soil covering work. As a result of examining the susceptibility of the larvae to insecticides registered on Welsh onion in laboratory conditions, 8 insecticides had a corrected mortality rate of 70% or more out of 30 insecticides; Thiodicarb WP, Clothianidin WS, Cypermethrin E, Dinotefuran WS, Fulfenokthlon E, Lufenuron E. Methomyl WP, and Tephrtorin G.
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Makoto DOI, Ryohei NAKANO, Ryusuke ISHIKAWA, Haruki KATAYAMA
2017 Volume 2017 Issue 64 Pages
113-117
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Hiroshi OIDA, Takuya ISHIDA, Shou TAKAHASHI
2017 Volume 2017 Issue 64 Pages
118-121
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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We investigated the density fluctuation of Thrips tabaci Lindeman and Gynaeseius liturivorus (Ehara) on Welsh onion and Anaphothrips obscurus (Müller) and G. liturivorus on intercropping barley‘Hyakumangoku’ in 2013 and 2014 in Chiba Prefecture, Japan. Gynaeseius liturivorus densities on barley increased in late July after peak abundance of A. obscurus. Densities of G. liturivorus and T. tabaci on Welsh onion intercropping with barley in late July was significantly higher and lower than on Welsh onion without barley (=control), respectively. Barley plants sowed in late May or early June in this experiment withered in late August. Gynaeseius liturivorus densities on Welsh onion intercropping with barley rapidly decreased after barley plants withered, and it shifted similarly or lower than on control Welsh onion in October to November. Thrips tabaci densities on Welsh onion intercropping with barley shifted equally on control Welsh onion after October. These results indicated that intercropping barley increases G. liturivorus density and decreases T. tabaci density on Welsh onion in late July. However, we need techniques to maintain high G. liturivorus density to control and lower T. tabaci density after intercropping barley plants withered.
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Kazuya SHIRAISHI, Hiroyasu ISHIMORI, Ichi OKUMURA, Takeshi SHIMOZONO, ...
2017 Volume 2017 Issue 64 Pages
122-125
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Akinobu NAKAMURA, Daiki YAMAZAKI, Machi TSURUTA, Kyo ITOYAMA
2017 Volume 2017 Issue 64 Pages
126-128
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Akihito OZAWA, Toru UCHIYAMA
2017 Volume 2017 Issue 64 Pages
129-133
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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We investigated the life history and the natural enemies of the coconut scale, Aspidiotus destructor Signoret (Hemiptera: Diaspididae), in some commercial tea fields from 2015 to 2017 in Shizuoka Prefecture, Japan. The periods of egg deposition and their hatching were observed three times a year: from late April to late May, one month in July, and from late August to late September, and most of overwintering stages were female adults. This result suggested that A. destructor occurs with three generations a year in tea fields. Total number of eggs per female of the overwintering generation was 58.7±2.8 (n=25). Four species of parasitoids emerged from the scale females collected in tea fields. The dominant species were two species, Encarsia citrine (Craw) and Aphytis diaspidis (Howard). It was observed that percentage parasitism by the dominant two species was sometimes over 90%, although it changed according to the season. We also found a kind of ladybird: Pseudoscymnus hareja (Weise) and predaceous gall midge (this species may be Dentifibula viburni (Felt) as predatory insects against the scale.
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Shinichi MASUI, Yuta TSUCHIDA
2017 Volume 2017 Issue 64 Pages
134-135
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Damage caused by western flower thrips Frankliniella occidentalis occurred on young fruits of kumquat Fortunella crassifolia in a greenhouse. Many white points observed on the fruits seemed to be caused by oviposition. By releasing the adults to young fruits, we demonstrated that the damage was caused by females infesting from 1 – 3 weeks after blooming.
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Shinichi MASUI, Haruki KATAYAMA
2017 Volume 2017 Issue 64 Pages
136-137
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Abstract The population density of yellow tea thrips Scirtothrips dorsalis is influenced by the quantity of young shoots for feeding and oviposition. In this study, the effect of trimming windbreaks of bigleaf podocarp trees on the occurrence of the thrips was investigated in citrus orchards. Trimming in mid-June resulted in an increase of the thrips adults and larvae on the windbreaks from mid-July to early August caused by the continuous growth of young shoots.
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Kazuhide UCHIDA, Yoshiteru MURAKAMI, Kyoko WATAUCHI, Yukihiro KUNUGI
2017 Volume 2017 Issue 64 Pages
138-140
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Tamito SAKURAI
2017 Volume 2017 Issue 64 Pages
141-142
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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Ryuji UESUGI, Koukichi NAGASAKA
2017 Volume 2017 Issue 64 Pages
143-145
Published: December 01, 2017
Released on J-STAGE: March 01, 2019
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The development of a method of the effective use of primary parasitoid wasps is necessary to control aphid populations in view of the negative impact of secondary parasitoids. Species identification using DNA sequences is a basic tool for the study of parasitoid wasps. In the present study, we used such an approach to identify primary and secondary parasitoid wasps of aphids that are frequently detected in the agricultural environment in Japan. We accordingly determined the DNA sequence of a barcoding region (mtCOI gene) in 179 individuals representing 11 species (two subfamilies) of primary parasitoids and eight species (five subfamilies) of secondary parasitoids, and these sequences have been deposited in the International Nucleotide Sequence Databases
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