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[in Japanese]
1976 Volume 22 Pages
1-3
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
3-5
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
5-6
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
7-9
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
9-10
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
11-14
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
14-16
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
16-18
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
18-20
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
20-23
Published: November 10, 1976
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Isamu MAEJIMA, Toshihiko KIMURA, Shigemi KOGA, Akira SHINKAI
1976 Volume 22 Pages
23-25
Published: November 10, 1976
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The movement of rice waika virus (RWV) inoculated by N. cincticeps in rice plant was traced by the recovery transmission and the electron microscope inspection. When inoculated to young seedlings, RWV was recovered from 12% of newly emerged leaves 3 days after inoculation and 78% after 7 days, but none recovered from the inoculated leaves. RWV could be recovered also from the primary tiller 14 days after inoculation. In electron microscope inspection, particles of RWV observed in the newly emereged leaves were a few after 7 days but increased after 14 days. As the result of leaf blade excision method, RWV seemed to move from the inoculated leaves to the upper leaves within 3 hours after inoculation.
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Toshihiko KIMURA
1976 Volume 22 Pages
26-28
Published: November 10, 1976
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Reaction of certain rice varieties to the rice waika virus was investigated in an insect-free, screened greenhouse. Inoculation was done on the seedlings of about 2.0-leaf age by Nephotettix cincticeps or N. virescence. (the 1st leaf means the primary leaf without blade)
Nine varieties examined for rice tungro disease group were tested for reaction to the rice waika virus. Taichung native 1 exhibited normal green coloring and slight stunting. The other eight varieties, FK 135, Acheh, IR 8, IR 24, Padma, Pankari 203, Latisail and Peta, showing a broad symptom reaction to the rice tungro disease group, all seemed to be resistant to the rice waika virus. Some Japanese varieties were tested in order to elucidate a cause of the outbreak of rice waika disease, but the subject was not made clear. Rice waika disease was found after a few years from releasing to the extension of Reiho. Subseqently, Reiho was revealed to be highly susceptible variety to this disease in both greenhouse and field test. Norin No. 18 and Hoyoku, both of which had been leading till Reiho extended, were also susceptible when the plants in seedling stage were inoculated and then kept in greenhouse. Their field reaction must be examined. The only varieties or line that showed greenhouse resistant reaction were Fukumasari, Kinmaze and Saikai No. 139.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
1976 Volume 22 Pages
29-32
Published: November 10, 1976
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1976 Volume 22 Pages
32-35
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
35-37
Published: November 10, 1976
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Kinji TANAKA, Fukuji NONAKA
1976 Volume 22 Pages
37-38
Published: November 10, 1976
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The optimum temperature for activities of water-soaked lesion development caused by both onion neck rot fungi, Botrytis squamosa and Botrytis allii, to onion bulbs stored under asceptic condition was at 20°C while thata ctivities decreased extremely at 25°C and 30°C. In single or double inoculation tests of the fungi, on the other hand, rottenness of onion bulbs were enhanced by the single inoculation of Aspergillus niger and by the both double inoculations of B. squamosa and A. niger, B. allii and A. niger, respectively, at 25°C and 30°C. It seemed to be true that the isolates of A. niger was probably concerned in rot of onion bulbs preserved in summer.
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[in Japanese]
1976 Volume 22 Pages
39-40
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
41-42
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
42-44
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
44-46
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
46-47
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
47-51
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
51-54
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
54-56
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
56-57
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
58-60
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
61-62
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
63-65
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
65-67
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
67-69
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
70-72
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
73-75
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
75-78
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
78-80
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
80-82
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
82-86
Published: November 10, 1976
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1976 Volume 22 Pages
86-88
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
88-91
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
91-94
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
94-99
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
100-101
Published: November 10, 1976
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[in Japanese]
1976 Volume 22 Pages
102-103
Published: November 10, 1976
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Jutaro HIRAO, Hitoshi INOUE
1976 Volume 22 Pages
104-106
Published: November 10, 1976
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The rice waika disease is a non-persistent virus transmitted by the green rice leafhoppers, Nephotettix spp. The most conspicuous symptom is stunting of diseased plants due to a decrease in the length of internodes. However, this symptom becomes distinct later than the booting stage. Thus, the period elapsed between the virus infection and the appearance of the distinct symptom is quite longer as compared with that of other rice virus diseases. This preliminary study was aimed at determining the testing methods of varietal resistance. Several varieties with different degrees of resistance observed in a field were tested in the three experiments, and N. cincticeps was used for the inoculation of the virus. In the Ist experiment, the testing seedlings of each variety were individually infected with viruliferous leafhoppers immediately after the acquisition feeding and transplanted in pots. In the 2nd experiment, the viruliferous leafhop-pers were placed on the mass of testing seedlings in flats with an insectary cage for inoculation feeding, and the seedlings were transplanted in the field (Field A). In the 3rd experiment, the seedlings of susceptible varieties were individually infected in the test tubes, and a certain number of these seedlings were transplanted in a row at the border of plots where testing seedlings were planted (Field B). The relative rank of varietal resistance was similar in the three methods and coincided with that observed in a field except one early-maturing variety, Nihonbare. The percent of diseased plants was reliable to indicate resistance. The relationship between the percent of diseased plants and the degrees of reduction in the culm length was shown by a highly significant positive correlation. Among the three methods tested, the last one is recommended to test a number of varieties simultaneously with the ease and less time-consuming. In this case, the infected seedlings would serve as a primary inoculum, from which the virus was subsequently transmitted to the testing plants by the field population of leafhoppers.
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
107-109
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
109-111
Published: November 10, 1976
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[in Japanese], [in Japanese]
1976 Volume 22 Pages
111-113
Published: November 10, 1976
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1976 Volume 22 Pages
113-115
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
115-117
Published: November 10, 1976
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1976 Volume 22 Pages
118-120
Published: November 10, 1976
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Nozomu MINAGAWA
1976 Volume 22 Pages
121-123
Published: November 10, 1976
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The injury of the southern root-knot nematode, Meloidogyne incognita, to a susceptible sweet potato variety, Norin No. 1, was investigated in a field in Kumamoto, Japan, heavily infested with M. incognita. Before planting the cuttings, a part of the field was treated with 320 liters per hectare of nematicide, EDB-EDC (15:40), as a check. At harvest, the number of tuberous roots per plant and their weights were measured and compared between nematicide-treated and untreated plots. The means of number and yield of tuberous roots per plant were increased in the nematicide-treated plots at 5% significant level, but there was no significant difference in the mean weights of tuberous roots between the two treatments. In the following year, without application of nematicide, there were no significant differences in these three characters between the two treatments simply because of the recovery of nematode populations.
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