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Teruo Nonomura, Hideyoshi Toyoda, Yoshinori Matsuda, Kosuke Ishikura, ...
2000 Volume 42 Pages
3-8
Published: May 11, 2000
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The inhibition mechanisms of antifungal indole derivatives, 5-fluoroindole, 4-fluoroindole and 5-bromoindole, were examined using
Fusarium oxysporum f. sp.
spinaciae. The suppression of mycelial colony growth of the phytopathogenic fungus by 5-fluoroindole and 4-fluoroindole was derepressed by the addition of tryptophan and anthranilic acid, an intermediary metabolite of tryptophan biosynthetic pathway. These results suggest that 5-fluoroindole and 4-fluoroindole inhibit function of anthranilate synthase catalyzing conversion of chorismic acid to anthranilic acid. On the other hand, the addition of these metabolites did not release the suppression of colony growth by 5-bromoindole, suggesting that the inhibition mechanism for 5-bromoindole is different from those for 5-fluoroindole and 4-fluoroindole. In addition, the inhibition efficiency of these indole derivatives was compared among different formae speciales (
lycopersici, melonis, fragariae, and
spinaciae) of
F. oxysporum. The result indicated that the colony growth of these fungi was suppressed at the different levels, and that these fungi could be distinguished each other by their colony sizes, especially when treated with 25μg/ml of 4-fluoroindole. The characteristic responses of the fungi to the compound could be effectively integrated to a monitoring system for marker gene-integrated transformants of different formae speciales of
F. oxysporum.
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Haruki Katayama, Makoto Doi, Hisatoshi Kobayashi, Kimihiko Katou
2000 Volume 42 Pages
9-14
Published: May 11, 2000
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Tomato spotted wilt virus (TSWV) has been a major problem for chrysanthemum product in Shizuoka prefecture since 1995 after Western Flower Thrips
Frankliniella occidentalis had expanded.In chrysanthemum stock plant fields,
F. occidentalis predominated and a number of thrips larvae occurred on shoots, April 1998. In June, 71% of stock plant fields and 14% of harvested greenhouses in this region indicated TSWV symptom. Among thrips isolated from chrysanthemum stock plants in April and June, 3.9-9.7% of
F. occidentalis female and 1.1-5.6% of thrips larvae were detected with TSWV-positive by double antibody sandwich enzyme-liked immunosorbant assay (DAS-ELIZA). Among a number of thrips adults isolated from flowers of harvested greenhouses,
F. occidentalis adults dominaed over 50% of thrips adults, however, only 1.0% was detected with TSWV positive, no thrips larvae were TSWV positive neither. Further,
F. occidentalis adults were isolated abundantly from flowers of
Trifolium repens and
Taraxacum officinale in this region; conversely, no one was detected with TSWV positive, but only one larva isolated from
Bidens pilosa was TSWV positive. In this investigation,
F. intonsa were collected abundantly from flowers of greenhouse chrysanthemum and flowering weeds,on the contrary,no female was detected with TSWV -positive.
Therefore these investigations indicate that chrysanthemum stock plants infected with TSWV grow the viruliferous
F. occidentalis most abundantly from spring to early summer and supply the infected nursery plants to hasten TSWV expansion.
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Hayato Horiuchi, Hiroshi Hagiwara, Satoshi Izutsu, Yoshihiro Taguchi
2000 Volume 42 Pages
15-19
Published: May 11, 2000
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In 1998, root and petiole rot of
Spathiphyllum was occurred at commercial growers glass houses in Gifu city.
Cylindrocladium sp. isolated from diseased plants was demonstrated as the causal agent. Based on morhological and cultural characteristics, the causal fungus was identified as
Cylindrocladium spathiphylli Schoulties, El-Gholl & Alfieri. Among ten fungicides tested, benomyl WP and triflumizole WP could control the disease.
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Yoshinori Kunimoto
2000 Volume 42 Pages
23-26
Published: May 11, 2000
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The effective method for chemical control of mites was investigated at the strawberry fields in 1998. Chlorfenapyr (50ppm), effective to mites, was sprayed at lower nozzle position to strawberry plants, a few leaves of which were removed after planting. As the result, the mite could not be found until April after planting in September of the previous year. In the similar treatment, chlorfenapyr (50ppm) firstly was sprayed and then a week later etoxazol (50ppm) was sprayed at the lower nozzle position at the grower's field. The mites were kept at a very low density level until early April after plantig in the September of the previous year.
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Manabu Shibao, Hiroshi Tanaka
2000 Volume 42 Pages
27-30
Published: May 11, 2000
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Effects of a predator,
Orius strigicollis (Poppius) on the population of the western flower thrips,
Frankliniella occidentalis (Pergande) was investigated on greenhouse eggplant (cultivar: Mizunasu) in 1999. In the released plot, 2.2 of
O. strigicollis adults per plant were released twice in April.
F. occidentalis population density on leaf and flower was kept lower in the released plot than in the control plot. The proportion of damaged fruits caused by the thrips was significantly lower in the released plot than in the control plot.
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Kiyotomo Futai, Ken-ichi Yamashita, Hisanori Tanaka
2000 Volume 42 Pages
31-32
Published: May 11, 2000
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Tadashi Takahara, Masahiro Ueda, Manabu Shibao, Hiroshi Tanaka
2000 Volume 42 Pages
33-34
Published: May 11, 2000
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Manabu Shibao, Hiroshi Tanaka
2000 Volume 42 Pages
35-36
Published: May 11, 2000
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Yutaka Tanaka
2000 Volume 42 Pages
37-38
Published: May 11, 2000
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Takanori Matsuo, Tsugio Shimohara
2000 Volume 42 Pages
39-40
Published: May 11, 2000
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Masaki Yamamoto, Manabu Shibao, Hiroshi Tanaka, Tsuyoshi Sugimoto
2000 Volume 42 Pages
41-42
Published: May 11, 2000
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Koji Hamuro, Manabu Shibao
2000 Volume 42 Pages
43-44
Published: May 11, 2000
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Hiroshi Takaki, Yutaka Iwamoto, Takunobu Kyuno, Shinji Nishiguchi, Kei ...
2000 Volume 42 Pages
45-46
Published: May 11, 2000
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Satoshi Izutsu, Hiroshi Hagiwara, Masayashi Ishii, Yoshiaki Chikuo
2000 Volume 42 Pages
47-48
Published: May 11, 2000
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Leaf and stem blight of thistle (
Cirsium japonicum DC.) and gazania (
Gazania pavonia×Gazania rigens.) were found in Mie prefecture, Japan in 1997 and 1998, respectively. From the diseased plants and sclerotia formed around diseased plants,
Sclerotium rolfsii Sacardo was isolated. The isolates
S. rolfsii had pathogenicities to their original host plants. Optimum temperatures for growth of
S. rolfsii, isolated from thistle and gazania, were 30°C on PSA medium. Diseases of thistle and gazania caused by
S. rolfsii were first found in Japan. So we proposed to designate the diseases as southern blight of thistle and gazania.
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Kei Sugawara, Yoshiaki Chikuno, Hiroshi Hagiwara, Satoshi Izutsu
2000 Volume 42 Pages
49-50
Published: May 11, 2000
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Masaharu Kubota, Kazuo Abiko
2000 Volume 42 Pages
51-52
Published: May 11, 2000
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In August 1998, a cabbage plug seedling was affected with hypocotyl rot and damping off in a vegetable seedling nursery in Hisai, Mie Prefecture.
Pythium sp. was isolated from the diseased seedling. The isolate's morphology corresponded to that of
Pythium volutum, which includes
P. zingiberis as a synonym in van der Plaats-Niterink's monograph. But the isolate was different from
P. volutum in temperature response. So we separated the both species and identified the isolate with
P. zingiberis. The isolate caused damping off in the inoculation tests, especially at high temperature. It could scarcely infect cabbage seedlings older than three weeks after sowing.
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Yutaka Iwamoto, Hiroshi Takaki, Yasuyuki Osada, Itsuki Nishimura
2000 Volume 42 Pages
53-54
Published: May 11, 2000
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Katsutoshi Kuroda, Akira Tomikawa
2000 Volume 42 Pages
55-56
Published: May 11, 2000
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Shoichi Kobayashi, Tagui Umezawa, Manabu Shibao, Hiroshi Tanaka
2000 Volume 42 Pages
57-58
Published: May 11, 2000
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Yumiko Taniyama, Ryota Tarui, Manabu Shibao, Hiroshi Tanaka
2000 Volume 42 Pages
59-60
Published: May 11, 2000
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Tooru Kitagami, Norihide Ohkubo
2000 Volume 42 Pages
61-62
Published: May 11, 2000
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Naoki Katsuyama, Yoshihiro Taguchi
2000 Volume 42 Pages
63-64
Published: May 11, 2000
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Ken-ichi Yamashita, Kiyotomo Futai, Hisanori Tanaka
2000 Volume 42 Pages
65-66
Published: May 11, 2000
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Yoshihiro Taguchi, Hirotsugu Tsueda, Naoki Katsuyama, Yoshinori Yamamo ...
2000 Volume 42 Pages
67-68
Published: May 11, 2000
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Yoshihiro Taguchi, Takashi Suzuki, Hideki Watanabe, Norihiko Ohkata
2000 Volume 42 Pages
69-70
Published: May 11, 2000
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Hirotsugu Tsueda, Yoshihiro Taguchi
2000 Volume 42 Pages
71-72
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Shuji Kaneko
2000 Volume 42 Pages
73-74
Published: May 11, 2000
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Kazumasa Maekawa, Masataka Aino, Yutaka Iwamoto
2000 Volume 42 Pages
75-76
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Masayuki Togawa
2000 Volume 42 Pages
77-78
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Hiromichi Nitta
2000 Volume 42 Pages
79-80
Published: May 11, 2000
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Hiromichi Nitta, Yuji Nishikawa, Masamichi Miyoshi, Hiroaki Kurihisa, ...
2000 Volume 42 Pages
81-82
Published: May 11, 2000
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Hiromichi Nitta, Yuji Nishikawa, Masamichi Miyoshi, Hiroaki Kurihisa, ...
2000 Volume 42 Pages
83-84
Published: May 11, 2000
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Yukio Kosugi
2000 Volume 42 Pages
85-86
Published: May 11, 2000
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Yukio Kosugi
2000 Volume 42 Pages
87-88
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Masaharu Kubota, Kazuo Abiko
2000 Volume 42 Pages
89-90
Published: May 11, 2000
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In June 1999, young fruits of watermelon were rotten in the open-air field in Ano, Mie Prefecture, Japan. White mycelia grew on the damaged fruite and were isolated. Two isolates were identified to
Pythium aphanidermatum. The isolates infected fruits of watermelon, cucumber and Japanese pumpkin and made them rotten. This is the first report about watermelon fruit rot by
P. aphanidermatum in Japan. We propose to designate the disease as Pythium fruit rot of watermelon.
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Hiroshi Tanaka, Takaaki Hosoi, Ken-ichi Sekimoto, Hideki Tani, Manabu ...
2000 Volume 42 Pages
91-92
Published: May 11, 2000
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2000 Volume 42 Pages
93-100
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[in Japanese]
2000 Volume 42 Pages
101-109
Published: May 11, 2000
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[in Japanese]
2000 Volume 42 Pages
110-119
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[in Japanese], [in Japanese], [in Japanese]
2000 Volume 42 Pages
120-123
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[in Japanese], [in Japanese]
2000 Volume 42 Pages
124-127
Published: May 11, 2000
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