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Hajime KATO
1994 Volume 1994 Issue 45 Pages
1-2
Published: November 30, 1994
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Kuniaki TSUKIJI, Ryoji KAWAMURA, Ikuo ONODERA
1994 Volume 1994 Issue 45 Pages
3-5
Published: November 30, 1994
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1. Seasonal Occurrence and its Related Environmental Factors
Shigeru OSADA, Masashi SASAHARA, Makoto INO
1994 Volume 1994 Issue 45 Pages
6-9
Published: November 30, 1994
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2. Disease Control and the Influence of Cold Summer on its Efficiency
Shigeru OSADA, Makoto INO, Masashi SASAHARA
1994 Volume 1994 Issue 45 Pages
10-13
Published: November 30, 1994
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7. Effect of Fungicide Application Timing on Control of Sheath Blight and Grain Yield of Rice Plant
Keiji OHTA, Hitoshi SAITO
1994 Volume 1994 Issue 45 Pages
14-16
Published: November 30, 1994
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Toru TAKEUCHI
1994 Volume 1994 Issue 45 Pages
17-20
Published: November 30, 1994
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Toru TAKEUCHI
1994 Volume 1994 Issue 45 Pages
21-26
Published: November 30, 1994
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Akemi KIKUTA, Toshio OIKAWA
1994 Volume 1994 Issue 45 Pages
27-28
Published: November 30, 1994
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Katsuhiko CHIBA, Fusaharu NAKATANI
1994 Volume 1994 Issue 45 Pages
29-31
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Motosige SIMIZU
1994 Volume 1994 Issue 45 Pages
32-34
Published: November 30, 1994
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Shinji YASUOKA
1994 Volume 1994 Issue 45 Pages
35-37
Published: November 30, 1994
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Shigeo NAITO, Toshiya SUGIMOTO
1994 Volume 1994 Issue 45 Pages
38-42
Published: November 30, 1994
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An attempt was made to clarify factors affecting disease suppressiveness and sclerotial decline in
Rhizoctonia solani AG-2-2 type N, the causal agent of the root rot disease, in soil around the dead or diseased roots of sugarbeet. The more a distance from the diseased root increased, the lower the germination ability of the sclerotia was. Some antagonistic fungi, obtained from the sclerotia in soil around the diseased root, markedly suppressed the damping-off disease of sugarbeet caused by the AG-2-2. When the decomposed residues collected from the dead roots were added to the soil severely infested with the AG-2-2, they reduced root rot disease in comparison with the check without the residues or with residues heated at 100°C for 10min. With the residues in which insect larvae of
Pnyxia scabiei killed by isoxathion of insecticide, the root rot disease declined though its severity was higher than when raw residues were added.
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Shizuka OZAWA, Hidehumi OBATA, Shinji YASUOKA, Fumio TANAKA
1994 Volume 1994 Issue 45 Pages
43-44
Published: November 30, 1994
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Akira SAYAMA, Kiroku KOBAYASHI, Akira OGOSHI
1994 Volume 1994 Issue 45 Pages
45-48
Published: November 30, 1994
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Seiji KANEMATSU, Ken-ichiro HONDA, Yoshiro MIKOSHIBA, Shun-ichi MIYAI, ...
1994 Volume 1994 Issue 45 Pages
49-52
Published: November 30, 1994
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In Yamase area, Pacific coastal area of Aomori and Iwate Prefectures, soybean dwarf disease caused by soybean dwarf virus (SDV) is a very serious problem for soybean production. However, in that area, we found that soybean plants which showed wrinkling leaves, one of the symptoms of dwarf disease, were always infected with neither SDV nor other viruses and restored to health under warm condition. So it was thought to be a physiological disorder.
Experiments were conducted to examine whether this disorder was induced by low temperatures. As a result, we demonstrated healthy soybean plants showed wrinkling leaves under the condition of low temperatures. This suggested that leaf-wrinklings were not always associated with SDV infection. Hence observation of yellowing of lower leaves, the other symptom of dwarf disease of soybean, or enzyme linked immunosorbent assay should be done for diagnosing dwarf disease of soybean.
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Toshimichi OKUBO
1994 Volume 1994 Issue 45 Pages
53-55
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Toshimichi OKUBO
1994 Volume 1994 Issue 45 Pages
56-57
Published: November 30, 1994
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Yoshikazu ANDO, Yasumori AKASAKA, Fusaharu NAKATANI
1994 Volume 1994 Issue 45 Pages
58-59
Published: November 30, 1994
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Shigemi KIKUCHI, Shouichi YUUKI
1994 Volume 1994 Issue 45 Pages
60-61
Published: November 30, 1994
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Yasuhiro IWATA, Osamu TAMURA, Akio SUMINO
1994 Volume 1994 Issue 45 Pages
62-66
Published: November 30, 1994
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Takashi HAGITA, Jun SASAKI
1994 Volume 1994 Issue 45 Pages
67-71
Published: November 30, 1994
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2. Investigation of Inoculation Methods
Kazunori KATSUBE, Yasumori AKASAKA, Fusaharu NAKATANI
1994 Volume 1994 Issue 45 Pages
72-75
Published: November 30, 1994
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Inoculation methods of nonpathogenic
Fusarium oxysporum (NPF) were investigated for inducing the disease suppressiveness against Fusarium wilt of spinach, caused by
F. oxysporum f. sp.
spinaciae. For an efficient induction of disease suprresiveness against Fusarium wilt of spinach, inoculum density of NPF for soil-application of a bud-cell suspension, was neccessary more than 10 times of a pathogen inoculum density. However, the disease suppressiveness was not induced significantly when a high density of pathogen (10
4 bud-cell/g of soil) was applied to soil. Disease suppressiveness was observed for 18 days when seedlings grown for 14 days on soil mix nursery pre-inoculated with NPF (1.7×10
6/g of soil) were transplanted to the infested soil.
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Shigeru MORIYA, Kazuhiro WATANABE, Kazufumi NISHI
1994 Volume 1994 Issue 45 Pages
76-79
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Shigeru OSADA
1994 Volume 1994 Issue 45 Pages
80-83
Published: November 30, 1994
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A new bacterial disease of parsley (
Petroselinum crispum Nym.), bacterial rot, was found grown vinyl-house condition in winter of 1993 in Miyagi Prefecture, Japan. A dark-green lesion on the petioles appeared as an initial symptom, and the symptom developed into brownish rot, resulting from the enlargement of the lesions. Twelve bacterial isolates obtained from the affected petioles were identified as
Pseudomonas marginalis pv.
marginalis (Brown 1918) Stevens 1925 on the basis of their bacteriological properties. This is the first report for this bacterium to attack parsley in Japan.
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1) Detection of CMV from Aphids
Kazumi SUZUKI, Akira SAITO, Piyasak CHAUMPLUK, Yukiko SASAKI, Yasufumi ...
1994 Volume 1994 Issue 45 Pages
84-87
Published: November 30, 1994
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Piyasak CHAUMPLUK, Yukiko SASAKI, Akira SAITOH, Hiroyuki KOIWA, Yasufu ...
1994 Volume 1994 Issue 45 Pages
88-92
Published: November 30, 1994
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Two isolates of cucumber mosaic virus (CMV), E5 and C7-2 were isolated from gentian plant (
Gentiana sp.), showing severe mosaic symptoms with necrotic spot in Iwate prefecture. Both were compared and proved to be new isolates identified by serology, particle morphology, symptom appearance on test plants, and analyses of viral coat protein and nucleic acid. E5, causing severe necrotic ring spot on Tetragonia expansa test plant, contained no satellite RNA in its virion, while C7-2, causing mild mosaic with ring scar on same test plant encapsidated non-necrogenic satellite RNA in its virion. Both were found to be serologically related to subgroup I of CMV.
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Yasumori AKASAKA, Yosikazu ANDO, Husaharu NAKATANI
1994 Volume 1994 Issue 45 Pages
93-95
Published: November 30, 1994
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Kazuhiko KAJI, Kiichi TAIRAKO, Takahiro SONODA
1994 Volume 1994 Issue 45 Pages
96-99
Published: November 30, 1994
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Harukuni HORITA
1994 Volume 1994 Issue 45 Pages
100-103
Published: November 30, 1994
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In 1992, a unknown disease showing soft rot was found on calla in Hokkaido prefecture. The symptoms were yellowing and rot in the aerial parts and the whole of the plant, spreading to the rhizomes. The bacterium isolated from the part of fresh symptoms was pathogenic to calla. The morphological, cultural and biochemical characteristics of the bacterium agreed with those of
Erwinia carotovora subsp.
carotovora. This is the first report of bacterial soft rot on calla in Hokkaido prefecture.
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Harukuni HORITA
1994 Volume 1994 Issue 45 Pages
104-107
Published: November 30, 1994
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In 1992, bacterial disease indicated as stem rot of chrysanthemum was detected in Hokkaido prefecture. Bacteria isolated from the diseased plants were pathogenic to chrysanthemum by an artificial inoculation. The bacterial isolates produced indole, were positive for phosphatase and lecithinase, and were sensitive for erythromycin. The isolates were unable to produce acid from lactose and trehalose, but able to utilize malonate. Thus, the bacterium causing the disease was identified as
Erwinia chrysanthemi.
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Makiko SUTO, Chieko TAKAHASHI
1994 Volume 1994 Issue 45 Pages
108-109
Published: November 30, 1994
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Norio NAKAZAWA, Koji FUJITA, Yoshifumi FUKUSHI
1994 Volume 1994 Issue 45 Pages
110-113
Published: November 30, 1994
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Tadashi OGATA, Keizoh ITO, Masafumi OCHIAI
1994 Volume 1994 Issue 45 Pages
114-116
Published: November 30, 1994
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Shoichi YUUKI, Shigemi KIKUCHI, Kiyoshi DOMON
1994 Volume 1994 Issue 45 Pages
117-121
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Kinsuke YUKITA
1994 Volume 1994 Issue 45 Pages
122-125
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Hitoshi IWAYA
1994 Volume 1994 Issue 45 Pages
126-128
Published: November 30, 1994
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Masahiko OSANAI, Nobuyuki OYAMA
1994 Volume 1994 Issue 45 Pages
129-131
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Sigeyuki IIMURA
1994 Volume 1994 Issue 45 Pages
132-136
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Masahide MIYATA
1994 Volume 1994 Issue 45 Pages
137-138
Published: November 30, 1994
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Sigeru SUZUKI, Sigeyuki IIMURA, Masaki ITOU, Kuniaki TUKIZI, Ryouzi KA ...
1994 Volume 1994 Issue 45 Pages
139-141
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Takashi KIDOKORO
1994 Volume 1994 Issue 45 Pages
142-144
Published: November 30, 1994
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1. Appearence of Low Susceptible Population to the Propoxur
Syunichi SHIBUYA
1994 Volume 1994 Issue 45 Pages
145-146
Published: November 30, 1994
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Susceptibility of the rice leaf beetle (RLB) to the insecticides, especially PHC (Propoxur), was investigated in Miyagi Prefecture. The RLB collected from Medesima clearly indicated a low susceptible response to the PHC. The median lethal dose, LD
50, of PHC in this population was at 523μg/g. As PHC had been used broadly in Miyagi prefecture, this low susceptibility is presumably related to the extent of control using PHC as systemic insecticide.
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Osamu SAITO
1994 Volume 1994 Issue 45 Pages
147-149
Published: November 30, 1994
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Trap capture survey of the seedcorn fly,
Delia platura, was carried out by using the kairomone and the fish meal as an attractant in Sapporo, Hokkaido. The kairomone trap attracted two or three times of the flies than the fish meal trap. The fly was attracted well in spring and autumn by the kairomone trap, whereas the fly was attracted well in summer by the fish meal trap. The captured female ratio was low in percent through whole survey period in the kairomone trap but the ratio was high in the fish meal trap.
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Hidenori TORIKURA
1994 Volume 1994 Issue 45 Pages
150-152
Published: November 30, 1994
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The black bean aphid was found on seed-stalk of beet at Date, southern Hokkaido in late October of 1993. The collected materials were alate and apterous viviparous females and no males were included, which suggests that the population is unholocyclic. This is the first record of
Aphis fabae fabae Scopoli from Japan, though another subspecies,
A. f. solanella Theobald, had been found from Honshu on
Solanum nigrum and
Cirsium spp. in 1982. Biometric data for the materials and figures of the aptera are given.
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Hidenori TORIKURA
1994 Volume 1994 Issue 45 Pages
153-155
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Tadafumi NAKATA
1994 Volume 1994 Issue 45 Pages
156-157
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Seasonal prevalence of Greenhouse Whitefly,
Trialeurodes vaporariorum (Westwood) was investigated in the potato field at Hitsujigaoka, Sapporo, Hokkaido prefecture (43°0'N, 141°25'E) from 29 May to 20 September in 1991 which was corresponding to the sprouting stage to withering stage of potato in the field. Immigration of
T. vaporariorum started in early June and the adults appeared until in mid-September. However, the population density was very low throughout the year.
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Osamu SAITO
1994 Volume 1994 Issue 45 Pages
158-159
Published: November 30, 1994
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Survival of the diamondback moth,
Plutella xylostella (L.), were examined in low constant temperature at +5, 0 and-5°C. The adult had the strongest tolerant to low temperature than the other developmental stages, and they survived over two months in +5 and 0°C. The eggs, older larvae and pupae lived till over one month in +5 and 0°C whereas almost of the all developmental stages died for about ten days in-5°C. The younger larvae had relatively weak tolerant to low temperature.
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Osamu SAITO
1994 Volume 1994 Issue 45 Pages
160-162
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Hibernation of the diamondback moth,
Plutella xylostella (L.) were surveyed in the field or in the greenhouse at Sapporo, Hokkaido, 1984-1986. The larvae, pupae and adults survived till January or February, but no living indibividuals were found in April in each winter season in the cabbage field. In the greenhouse condition without heating, the diamondback moth could hibernate in the winter 1984-1985, whereas they couldn't in the season 1985-1986.
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Toru MIZUKOSHI
1994 Volume 1994 Issue 45 Pages
163-167
Published: November 30, 1994
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Control effect of chlorfluazron was decreased markedly in the field test at Oono in 1993, when a large scale immigration seemed to be occurring in Hokkaido. Although the susceptibility to chlorfluazron and teflubenzuron was evaluated by the application method using the 2nd instar larvae in the laboratory, mortality rates varied drastically according to repetitions and concentrations. From these results, it is supposed that the Oono population in 1993 consisted of numerous individuals with low to high resistance levels. In Hokkaido, a highly resistant population to pyrethroid insecticide emerged in 1990. However, this population showed a high susceptibility to chlorfluazron in both field and laboratory tests. In this report, the low susceptibility of
P. xylostella to pyrethroid and IGR in the Oshima district is described.
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10. Relationships among Density of Trichogramma chilonis (Hymenoptera: Trichogrammatidae) Released, Percentage of Parasitism, and Mortality due to Host Feeding
Kouro SATO, Osamu MOCHIDA, Atsushi KIKUCHI
1994 Volume 1994 Issue 45 Pages
168-170
Published: November 30, 1994
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Trichogramma chilonis wasps were released to 40 diamondback moth eggs per potted cabbage plant covered with net at 5 different population densities of about 0, 34, 68, 680, and 3400 wasps. At the highest density of about 3400 wasps per 40 diamondback moth eggs on a plant, an average of 45.6% diamondback moth eggs was parasitized and additively that of 50.8% was killed probably due to host feeding of wasps. Namely about 3% of diamondback moth eggs only hatched out. Thus, efficacy of
Trichogramma wasps against diamondback moth eggs should be judged from not only percentage of parasitism but also host egg mortality probably due to host egg feeding, or hatchability of diamondback moth eggs.
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