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Ichiro FUNSAWA, Norio IIZUKA, Yoshimasa ISHII
1987 Volume 29 Pages
1-5
Published: May 01, 1987
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A disease of carrot plants showing yellowing of leaves and stunting of growth occurred in Hokkaido. Foliage symptoms consisted of chlorotic mosaic, yellowing and malformation of leaflets. The virus, spherical particle with 25 nm in diameter, infected the plants of 30 species from 10 families, and positively reacted with broad bean wilt virus (BBWV) antiserum. In thin sections of the diseased broad bean leaves, crystalline arrays of virus particles and amorphous vesicular body were observed in the cytoplasm. From these results, it is evident that the causal virus is BBWV. When carrot plants were infected with BBWV in the early stages of plant growth, the yield of root crops was reduced by about 30%.
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Kenji KAWAMOTO, Toshitugu OKADA
1987 Volume 29 Pages
7-10
Published: May 01, 1987
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The number of generations per year of the cabbage webworm,
Hellula undalis FABRICIUS was investigated in Ano, Mie Prefecture, Central Japan. Seasonal changes in the number of larvae on Japanese radish plants and males caught by virgin female traps showed that the cabbage webworm occured six times in 1985. The number of generations in a field agreed with the value calculated from the total effective temperature for the development of one generation of the cabbage webworm and the monthly mean temperatures in 1985. Since the males were caught in April and May, it is assumed that the cabbage webworms hibernate in the larva and pupa stages. However, most of the larvae which were found on Japanese radish in autumn died in winter, and a small number of larvae were found until April of the following year.
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Yuichi TAKIKAWA, Shinji TSUYUMU
1987 Volume 29 Pages
11-15
Published: May 01, 1987
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In May and June, 1984, a new bacterial disease was observed on greenhouse-planted cucumber in Shizuoka Prefecture. The disease appeared on the leaves as a pin-point, water-soaked lesion which enlarged to form a brown, necrotic, angular spot. There was no tendency of the lesions to tear out. The causal bacterium was a gram-negative, aerobic rod with single polar flagellum. It formed a yellow slimy colony, liquefied gelatin, produced hydrogen sulfide and hydrolyzed starch. It neither reduced nitrate to nitrite, nor produced arginine dihydrolase or lecithinase. Acid was produced from glucose, sucrose, lactose, starch, dextrin and glycogen, but not from mannitol, ribose or dulcitol. By inoculation, the causal bacterium showed strong pathogenicity on cucumber, pumpkin and watermelon, but not on cabbage, bean or tomato. From these results, the causal bacterium was identified as
Xanthomonas campestris pv.
cucurbitae (Bryan 1926) Dye 1978. This is the first report of bacterial brown spot disease of cucumber in Japan.
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Masahiko MORISHITA, Katutiyo AZUMA
1987 Volume 29 Pages
17-20
Published: May 01, 1987
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Susceptibility to six pesticides of eight populations of the diamonback moth,
Plutella xylostella, collected from Wakayama prefecture was determined in 3rd inster larvae by the leaf dipping method. Most of the populations showed remarkably reduced susceptibility to methomyl, prothiophos and acephate. Low susceptibility to fenvalerate + malathion was found in the populations collected from Wakayama, Gobou and Inami, where cruciferous crops were extensively grown in spring and autumn. Furthermore, the Gobou population showed low susceptibility to permethrin, cypermethrin and flucythrinate. All populations except the Gobou population were toxic to cartap. Although no resistance to
Bacillus turingiensis (Toaro CT) was found among 6 populations, LC
50 value against
B. turingiensis in the Gobou population was higher than that of the other populations, and increased with time.
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Tomohiro HORIKAWA
1987 Volume 29 Pages
21-26
Published: May 01, 1987
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The population of the strains of
Pestalotia longiseta, causal fungus of tea gray blight, resistant to benzimidazole fungicides is increasing in tea fields in spite of the limited application of the fungicides applied for the control of the fungus. Therefore the differences in the pathogenicity to tea plant, cultivar YABUKITA, of sensitive (S), moderately resistant (MR) and highly resistant (HR) strains were investigated. Tea plant were inoculated with conidia of individual strains or of a mixed suspension containing an equal proportion of population of S, MR and HR strains in the fields. There were no significant differences in the number of diseased leaves/m
2, ratio of diseased stems and the size of the lesions among the S, MR and HR strains based on the results of an analysis of the disease severity in the plots at 16 days after inoculation. In the plots inoculated individually with S, MR or HR strains, the lesions conformed mostly S, MR or HR strains, respectively. However, the reisolation frequency of the S strains was equal to or lower than that of the MR or HR strains in the plots in which mixed suspensions of strains differing in the sensitivity were inoculated. Each lesion formed by the inoculation with a mixture of the three strains with different sensitivity was found to contain mainly either the S, MR or HR strains. Consequently, the increase in the incidence of the resistant strains was ascribed to the fact that the fitness of the MR or HR strains under field conditions was not necessarily lower than that of the S strains, as well as to the selection pressure of benzimidazole fungicides sprayed during the growth period of the new shoots, at a different time from the application time to gray blight, for the control of other diseases.
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Kimiharu INAGAKI, Minoru TAMURA, Makoto MAKINO
1987 Volume 29 Pages
27-29
Published: May 01, 1987
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Rhizoctonia oryzae RYKER et GOOCH,
Sclerotium fumigatum NAKATA,
S. hydrophilum SACC. and
S. oryzae-stativae SAW. causing rice sclerotial diseases were used for investigation of their viability under natural and artificial conditions.
1) Under natural conditions, reisolation of hyphae from plant residues infected by those fungi after 90 days, resulted in generally higher frequency than that from scierotia exposed on the soil surface.
2) When sclerotia were sheathed in plant residues under natural conditions, they overwintered better than those exposed on the soil surface.
3) Regardless of the wide moisture range (0%-10-97%-100%), sclerotia of
S. oryzae-sativae survived for 240 days under artificial conditions (25-28C), although sclerotia of
R. oryzae and
S. fumigatum were less tolerant to such moisture conditions.
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Shin'ichi KUSAKARI, Yutaka TANAKA
1987 Volume 29 Pages
31-34
Published: May 01, 1987
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Three pathogens of
Pythium were isolated from diseased tomato root in hydroponics. The species isolated were varied with the season.
Pythium aphanidermatum and
P. myriotylum were detected most frequently in summer, but
P. dissotocum was in winter. Characteristic symptoms of the disease were wilting of the stem and root rot.
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
35
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
36
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
37-38
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
39
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
40
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
41-42
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
43
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[in Japanese]
1987 Volume 29 Pages
44
Published: May 01, 1987
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[in Japanese]
1987 Volume 29 Pages
45
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
46
Published: May 01, 1987
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[in Japanese]
1987 Volume 29 Pages
47
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
48
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
1987 Volume 29 Pages
49-50
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
51
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
52
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
53-54
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
55
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
56
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
57
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
58
Published: May 01, 1987
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[in Japanese]
1987 Volume 29 Pages
59
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
60
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
61-62
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
63-64
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
65
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[in Japanese]
1987 Volume 29 Pages
66
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
67
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
68
Published: May 01, 1987
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[in Japanese], [in Japanese], [in Japanese]
1987 Volume 29 Pages
69
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
70
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
71
Published: May 01, 1987
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[in Japanese]
1987 Volume 29 Pages
72
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1987 Volume 29 Pages
73-75
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1987 Volume 29 Pages
76-82
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1987 Volume 29 Pages
83-89
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
90-93
Published: May 01, 1987
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[in Japanese], [in Japanese]
1987 Volume 29 Pages
94-97
Published: May 01, 1987
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