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Masahiko Morishita
2003 Volume 45 Pages
1-4
Published: May 31, 2003
Released on J-STAGE: October 29, 2012
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The performance of the western flower thrips,
Flankliniella occidentalis (Pergande), on cultivars of
Eustoma russellianum Griseb. was measured by examining the proportion of damaged leaves in reenhouses. The percentage of damaged leaves was high in 'Mickey Bicolor Rose,''Nail Marine Neo' and 'Nail Peach Neo', and low in 'Clear Marine', 'Ex Rosa Pink', 'King of Snow', 'Azuma no Nami' and 'Azuma no Murasaki'. About 20% of the thrips larvae survived on leaves of a susceptible cultivar, 'Mickey Bicolor Rose', in thelaboratory, whereas it failed to propute on a resistant cultivar, 'Azuma no Murasaki'. This suggested that the resistant cultivars of
E. russellianum possess antibiotic resistance to
F. occidentalis. On the contrary, the thrips larvae showed a high survival rate (more than 60%) on the petals of both cultivars.
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Fumitoshi Yasuda, Hiroyuki Watanabe, Hiroki Izawa
2003 Volume 45 Pages
5-9
Published: May 31, 2003
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Sensitivity of field strains of
Venturia nashicola Tanaka et Yamamoto isolated from pear orchards in Tottoriprefecture to fenarimol (sterol demethylation inhibitor; DMI) was examined in 1997 and 1998. Mean EC
50 value of fenarimol for
V. nashicola field strains was 0.47 mg/
l, thus the sensitivity of the field strains to fenarimolbecame slightly lower, as compared to the baseline sensitivity. However, the efficacy of DMI fungicides on
V. nashicola in pear orchards was still sufficient to control the disease. Applications of DMI fungicides twice between mid April and early May were most effective.
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Shinichi Masui, Masanori Ikeda
2003 Volume 45 Pages
11-16
Published: May 31, 2003
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Occurrence of the citrus red mite,
Panonychus citri, and their predacious insects in Satsuma mandarin orchards were examined in three areas with different insecticides applications in Shizuoka prefecture. Only in the eastern area, where neonicotinoids and synthetic pyrethroids were not at all sprayed from July to September, the annualdensity of the mites in orchards decreased year by year from 2000 to 2002. In this area, predacious insects, such as
Oligota spp. and
Stethorus japonicus, increased following the increase in mite density. On the other hand, in both central and western areas, where neonicotinoids and synthetic pyrethroids were sprayed about 2 times fromJuly to September, the mite density did not decrease from 2000 to 2002. In these areas, predacious insects did not increase, despite the occurrence of the mites. These results suggested that the activity of predacious insects were affected by neonicotinoids and synthetic pyrethroids spayed from summer to autumn.
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Yutaka Iwamoto, Yasuyuki Osada, Masataka Aino, Takeshi Kanto
2003 Volume 45 Pages
17-21
Published: May 31, 2003
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We examined the thermal death point of
Plasmodiophora brasssicae for contorol of clubroot of
Brassicae campestris L. chinensis group. The pathogens in the soil were killed by dipping in 50°C hot water for 8 hours or in 55°C water for 4 hours or in 60°C water for 3 hours. The effect of soil sterilization with hot water injection on clubroot of
B. campestris L. chinensis group was examined in naturally infested field. Incidence of clubroot was significant in the heavily infsted field and the yield increased by the soil sterilization. The procedure of this ster-ilization method was as follows: Hot water about 90°C was prepared with boiler BW-30, and was sprinkled, through the heet resistant sprinkler hose, on the surface of the field covered with a heet resistant sheet.
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Hiroshi Tanaka, Manabu Shibao
2003 Volume 45 Pages
23-27
Published: May 31, 2003
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To elucidate the pattern of occurrence and dispersal of
Aculops lycopersici on tomato, the mite population was examined with a magnifying glass in 4 greenhouses every 1-2 weeks in June-October, 2000.
A. lycopersici was first detected in mid July and its peak density was observed in early October.
A. lycopersici dispersed to higher stems and leaves quickly, but slowly to adjacent plants. The main factor of the dispersal seemed to be artificial inoculation by farmers. Tydeid mites were effective natural enemies and spot-spraying of acaricides was recommended to preserve them for suppressing
A. lycopersici damage.
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Masahiko Morishita
2003 Volume 45 Pages
29-30
Published: May 31, 2003
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Two populations of
Flankliniella intonsa (Trybom), were collected from commercial greenhouses (strawberry and sweet pepper) in Wakayama Prefecture, Japan. Four females were transferred onto a kidney bean leaf,
Phaseorus vulgaris L., floated on 0.5% agar gel in a plastic Petri dish. The Petri dish, which contained 30-60 larvae 2 to 3 days after hatching, was sprayed with 6 ml of insecticides through a spraying tower. Of the organophosphates, dichlorvos, sulprofos, methidation, and fenitrothion were toxic with more than 90% of corrected mortality. Acrinathrin, chlorphenapir and emamectin benzoate also achieved high mortality. The Wakayama population collected from sweet pepper was more tolerant to some insecticides than the Iwade population which was collected from straw-berry.
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Masahiko Morishita
2003 Volume 45 Pages
31-32
Published: May 31, 2003
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Sticky traps were placed under the branch of peach trees that were infested by
Pseudaulacaspis prunicola (Maskell) in order to forecast the occurrence period of the 1st instar nymph in 2001 and 2002. There were three peaks of the occurrence: one is in late April to early May, another in early June and the other in late August.
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Izumi Ohta
2003 Volume 45 Pages
33-35
Published: May 31, 2003
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Host acceptance and host suitability of the cotton aphid,
Aphis gossypii for an indigenous parasitoid,
Lysiphlebus japonicus were investigated in the laboratory and compared with those for a commercially introduced parasitoid,
Aphidius colemani.
L. japonicus attacked 2-, 4- and 6-day-old aphids, but not 0-day-old ones. The rate of oviposition occurrence after attacking hosts was not significantly different between
L. japonicus and
A. colemani. However, the survival rate of
L. japonicus larvae in the hosts was significantly lower than that of
A. colemani. This suggests the low suitability of
A. gossypii as a host of
L. japonicus.
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Kanako Sugita, Hajime Hiromori, Masayoshi Hatsukade
2003 Volume 45 Pages
37-38
Published: May 31, 2003
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Sachiko Futagami, Hajime Hiromori, Masayoshi Hatsukade
2003 Volume 45 Pages
39-40
Published: May 31, 2003
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Toshihiko Kojima, Shigeo Komatsu
2003 Volume 45 Pages
41-42
Published: May 31, 2003
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Tooru Kitagami, Minoru Nishino
2003 Volume 45 Pages
43-44
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Fusako Fukushima, Sadahiko Yano
2003 Volume 45 Pages
45-46
Published: May 31, 2003
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The ditch (18cm in width, 18cm in depth) was installed around the greenhouse, and filled with water. It efficiently prevented the Kanzawa spider mite,
Tetranychus kanzawai Kishida and common cutworm,
Spodoptera litura (Fabricius) larva from invading into the greenhouses.
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[in Japanese]
2003 Volume 45 Pages
47-49
Published: May 31, 2003
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The control effect for the harvivorous thrips by releasing of predacious thrips,
Franklinothrips vespiformis (Crawford)(Fv) on greenhouse cucumbers was examined. Adults of Fv were released about one individual per plant, four times at about a week intarvals after flowering of cucumbers. Population densities of harvivorous thrips, Fv and indigenous
Orius spp. on leaves and flowers were investigated with separating an each developmental stage. Dominant species of harvivorous thrips were Thrips tabaci Lindeman on leaves and
Frankliniella intosa (Trybom) on flowers. Population densities of harvivorous thrips were suppressed at low level by Fv on leaves but not on flowers. Fv occurred only on leaves but
Orius spp. on both leaves and flowers. As a result, control effect on thrips by Fv was restricted on leaves but not on flowers, because the foraging behavior of Fv was observed more frequently on leaves than on flowers of cucumber plants.
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Masahiro Iguchi, Masahiko Morishita, Junko Yabuno, Fusako Fukushima, Y ...
2003 Volume 45 Pages
51-52
Published: May 31, 2003
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Ken Suzuki, Takashi Yamakami
2003 Volume 45 Pages
53-54
Published: May 31, 2003
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Katsura Kakogawa, Hiromichi Nitta, Hiroaki Kurihisa
2003 Volume 45 Pages
55-56
Published: May 31, 2003
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Shoichi Kobayashi, Hirohiko Okada, Chisa Maeda, Manabu Shibao, Hiroshi ...
2003 Volume 45 Pages
57-58
Published: May 31, 2003
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Yutaka Kubota, Yusuke Kanahori, Hironori Takeshita, Shin-ichi Kohsaka, ...
2003 Volume 45 Pages
59-60
Published: May 31, 2003
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Manabu Shibao, Hiroshi Tanaka
2003 Volume 45 Pages
61-62
Published: May 31, 2003
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Masahiro Taira, Akira Minemura
2003 Volume 45 Pages
63-64
Published: May 31, 2003
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Yoshitsugu Nasu, Hiroshi Tanaka, Manabu Shibao
2003 Volume 45 Pages
65-66
Published: May 31, 2003
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Akira Minemura, Masahiro Taira, Yasuhiro Nomura
2003 Volume 45 Pages
67-68
Published: May 31, 2003
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Makoto Furukawa, Manabu Shibao
2003 Volume 45 Pages
69-70
Published: May 31, 2003
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Keiji Itoh, Ayumi Oguri, Atutoshi Suzuki
2003 Volume 45 Pages
71-72
Published: May 31, 2003
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Shigemitsu Kimura
2003 Volume 45 Pages
73-74
Published: May 31, 2003
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Teruo Nonomura, Tomoya Hasegawa, Kazutomo Miyajima, Yoshinori Matsuda, ...
2003 Volume 45 Pages
75-78
Published: May 31, 2003
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In the present study, a green fluorescence protein (GFP) gene was introduced as a monitoring reporter into mycelial protoplasts of different formae speciales of
Fusarium oxysporum (
lycopersici, melonis and
fragariae) to analyze infection behavior of pathogenic and nonpathogenic fungi on roots of host and nonhost plants. Successful integration of the GFP gene into chromosome was confirmed by polymerase chain reaction and Southern hybridization analysis. GFP-marked fungi emitted bright green fluorescence under UV irradiation. Transformed microconidia of
F. oxysporum were inoculated by dropping conidial suspension onto roots of tomato and melon cotyledonal seedlings. Fungal development on roots was observed with a fluorescence microscope at the post-inoculation stage (1 to 3 days after inoculation). As a result, the microconidia of all formae speciales germinated and attached to root surface and elongated hyphae to reticulate root surface, irrespective of host and nonhost plants. After this reticular elongation of hyphae, the pathogenic fungi on host plant roots invaded to cause necrosis at the inoculation site of roots. Thus, the present results demonstrated that both pathogenic (
F. oxysporum f. sp.
lycopersici on tomato) and nonpathogenic fungi (
F. oxysporum f. sp.
fragariae on tomato and melon, and
F. oxysporum f. sp.
melonis on tomato) could indistinctively elongate hyphae and colonize host and nonhost plant roots at the early stage of inoculation, and only the pathogenic fungi invade host roots to cause the symptoms after mycelial colonization.
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Masayuki Togawa
2003 Volume 45 Pages
79-80
Published: May 31, 2003
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Katsutoshi Kuroda, Hirofumi Suzuki, Akira Tomikawa, Motohiro Suzumura
2003 Volume 45 Pages
81-82
Published: May 31, 2003
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Akashi Mochizuki, Hroyuki Maki, Takuya Kyuno, Yasuyuki Odsada, Hiroshi ...
2003 Volume 45 Pages
83-84
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Hiromichi Nitta, Katsuhiko Nakamoto
2003 Volume 45 Pages
85-86
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Yuji Nishikawa, Hiromichi Nitta
2003 Volume 45 Pages
87-88
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Hiromichi Nitta, Junko Kaneyoshi
2003 Volume 45 Pages
89-90
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Hiromichi Nitta
2003 Volume 45 Pages
91-92
Published: May 31, 2003
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Takuma Sugimoto, Shinya Yoshida, Masataka Aino, Toshiharu Onishi, Kuni ...
2003 Volume 45 Pages
93-96
Published: May 31, 2003
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Using the agar medium inoculation method, three isolates of
Phytophthora sojae were tested for virulence on six cultivars. In about 10 days, they were classified into race A, B or H, respectively. That period was from 14 to 19 days earlier than the conventional flooding inoculation method. Our proposed new method is available for the pathogenic test of
Phytophthora sojae.
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Yoshihiko Masuda
2003 Volume 45 Pages
97-98
Published: May 31, 2003
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Contamination of bacterial pea blight pathogen (
Pseudomonas syringae pv. pisi) on pea seeds (
Pisum sativum) was investigated in Wakayama prefecture in 2002. Pathogenic bacterium was detected at high frequency in theseed lots of private production at Inami town, both from dry seeds and from seedling beds under chilling treatment. The bacterium was not detected in five seed lots of offical production at Hashimoto city. Contamination check must be necessary for the reduction of the outbreak of bacterial blight.
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Satoshi Takai, Kazufumi Nishi, Yosihiro Taguchi, Hideki Watanabe, Naok ...
2003 Volume 45 Pages
99-100
Published: May 31, 2003
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Yasuhiro Nomura, Masahiro Kubota, Kazafumi Nisi
2003 Volume 45 Pages
101-102
Published: May 31, 2003
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Yasuhiro Nomura, Akira Minemura
2003 Volume 45 Pages
103-104
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Hiromichi Nitta, Yuji Nishikawa
2003 Volume 45 Pages
105-106
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Shoko Amano, Tadahiko Kobayashi
2003 Volume 45 Pages
107-108
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2003 Volume 45 Pages
109-118
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[in Japanese]
2003 Volume 45 Pages
119-126
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[in Japanese], [in Japanese]
2003 Volume 45 Pages
127-134
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[in Japanese], [in Japanese]
2003 Volume 45 Pages
135-138
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[in Japanese], [in Japanese]
2003 Volume 45 Pages
139-142
Published: May 31, 2003
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