-
Kazuo NAKAMURA
1998 Volume 1998 Issue 49 Pages
1-4
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Hiroo HONDA, Takashi HONMA, Tomohiro SATO, Hideki NAITO
1998 Volume 1998 Issue 49 Pages
5-7
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Masashi SASAHARA, Shigeru OSADA, Hideki NAITO
1998 Volume 1998 Issue 49 Pages
8-11
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Taketo ASHIZAWA, Kaoru ZENBAYASHI, Ryoichi SONODA, Shinzo KOIZUMI
1998 Volume 1998 Issue 49 Pages
12-14
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Three hundred eleven isolates of
Pyricularia grisea were obtained from panicle blast lesions in mixtures of rice cv. Sasanishiki and its nine isogenic lines in 1995 and 1996. And their pathogenic races were identified using Japanese differential rice cultivars. Although five races were identified, most of the isolates were belonged to race 007. Pathogenicity of blast fungus reisolated from leaf blast lesions formed on incompatible differential rice cultivars was also investigated. Pathogenicity of thirty reisolated strains to the differential cultivars was different from that of the original isolates, and nine races were newly identified. The ‘super race’ was not isolated from the mixtures.
View full abstract
-
Taketo ASHIZAWA, Kaoru ZENBAYASHI, Ryoichi SONODA, Shinzo KOIZUMI
1998 Volume 1998 Issue 49 Pages
15-18
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Seedling trap method was examined to estimate suitable mixed planting ratio of Sasanishiki isogenic lines for effective control of rice blast disease from 1996 and 1997. Mixed seedlings of rice cv. Sasanishiki and its isogenic lines were exposed for six to seven days in the paddy field, and number of infected seedlings with rice blast fungus,
Pyricularia grisea, was counted after the exposure. Number of the infected seedlings in the mixtures was correlated with ratio of susceptible isogenic lines or cultivar in them to the predominant pathogenic race of the blast fungus in the field. The result suggests that seedling trap is useful to estimate the suitable mixing ratio of the isogenic lines for effective control of the blast disease.
View full abstract
-
Masahiro YANASE, Tomiichi TAKEDA
1998 Volume 1998 Issue 49 Pages
19-23
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Takashi NAKAJIMA, Takashi KOBAYASHI, Kiyoshi ISHIGURO
1998 Volume 1998 Issue 49 Pages
24-26
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Shinzo KOIZUMI, Toshio TANI
1998 Volume 1998 Issue 49 Pages
27-32
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
A new
in vitro method was developed for evaluating field resistance to panicle blast in rice cultivars. Effectiveness of the method was examined over three seasons (1994-1996) using 29 rice cultivars and strains with different levels of field resistance to the disease. Panicles (including the boot leaf and one culm node) were detached from field grown rice plants at full heading. Each of the cut panicles was placed in a glass tube containing water. Neck nodes of the cut panicles were then wrapped in rectangular filter paper (5×7 mm) soaked in a spore suspension (5×10
5 conidia/m
l) of Pyricularia grisea. Lengths of blast lesions downward from the panicle neck nodes were measured 15 days after the inoculation. Lesion length was positively correlated with the percentage of diseased spikelets with panicle blast in field trials (significant at P<0.01). The results show that the method is useful for the evaluation of field resistance to panicle blast in rice cultivars.
View full abstract
-
Kazunori KATSUBE, Shin-ichi TAKEDA
1998 Volume 1998 Issue 49 Pages
33-36
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Kazunori KATSUBE, Shin-ichi TAKEDA
1998 Volume 1998 Issue 49 Pages
37-39
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Jun OYAMA, Kazuyo HAYASHI
1998 Volume 1998 Issue 49 Pages
40-41
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Tsuyoshi HAYASAKA, Hiroo HONDA
1998 Volume 1998 Issue 49 Pages
42-44
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Tamio TANAKA, Osamu TAMURA
1998 Volume 1998 Issue 49 Pages
45-50
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
In 1993-1996, isolates of
Fusarium oxysporum f. sp. melonis from diseased netted melon,
Cucumis melo L., with wilt symptoms were collected at Asahikawa, Monbetsu, Kita, Asibetsu, Tukigata, Fukagawa, Kurisawa and Furano in Hokkaido in Japan. All these isolates were identified as race O, according to Risser's system.
View full abstract
-
Motosige SIMIZU
1998 Volume 1998 Issue 49 Pages
51-53
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
In 1997, root rot occurred on butter head lettuce (
Lactuca sativa L.) cultivated at plastic-film houses in Asahikawa, Hokkaido. Diseased lettuce did not grow well and its outer leaves turned yellowish brown. Diseased primary root discolored in the vascular bundles, and its inner parts decayed. Causal fungus of this disease was identified as
Fusarium oxysporum f. sp.
lactucae from the pathogenicity and the morphological characteristics.
View full abstract
-
Nobuyuki ISHIZAKA, Kiyoshi TAKAHASHI
1998 Volume 1998 Issue 49 Pages
54-56
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Norihito YAMAUCHI, Kazuo ABIKO
1998 Volume 1998 Issue 49 Pages
57-60
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Jun SASAKI, Harukuni HORITA
1998 Volume 1998 Issue 49 Pages
61-64
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
1. Occurrence of Japanese Hornwort Witches' Broom, Garland Chrysanthemum Witches' Broom and Water Dropwort Yellows and Host Range of the Causal Phytoplasma
Shigeru OSADA, Toshiki SHIOMI, Minoru TANAKA
1998 Volume 1998 Issue 49 Pages
65-68
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
2. Occurrence of Spinach Yellows
Shigeru OSADA, Minoru TANAKA, Tamaki UEHARA, Izumi MATSUDA
1998 Volume 1998 Issue 49 Pages
69-72
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Seiji KANEMATSU, Soh HIDAKA, Toru MURAYAMA, Kiyoshi ISHIGURO
1998 Volume 1998 Issue 49 Pages
73-75
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Chrysanthemum stunt viroid (CSVd) was isolated from field grown chrysanthemums in Sagae, Yamagata Prefecture in 1995. The complete nucleotide sequence of the CSVd-Sagae isolate was determined (EMBL/GenBank/DDBJ accession number: D88895). It consists of 354 nucleotides and contains 4 substitutions relative to the English isolate, and 2 deletions and 6 substitutions relative to the Australian isolate. Phylogenetic relationship among seven CSVd isolates, including Japanese isolate (Tochigi-isolate), were also investigated.
View full abstract
-
Masayoshi ASARI
1998 Volume 1998 Issue 49 Pages
76-81
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Seishi OHBA, Hiroei KANNO, Hideki KIKUCHI
1998 Volume 1998 Issue 49 Pages
82-84
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Apple bordeaux mixture was sprayed on pear trees with severe occurrences of furit rot in Miyagi prefecture in 1997. Apple bordeaux mixture spray was recognized as an effective method to control fruit rot on early to late maturing cultivars of pear. Japanese pear spray calendar without brodeaux mixture was not effective to control pear fruit rot.
View full abstract
-
Seishi OHBA, Hiroei KANNO, Hideki KIKUCHI
1998 Volume 1998 Issue 49 Pages
85-87
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Most of pear fruits at their thickening growth before mid-June were not infected with physalospora canker. The symptoms of the disease on the fruits were observed after their maturity, and their susceptibility to fruit rot increased after mid-June. Weather conditions had little effect on the chemical control with 9 day spray interval after mid-June.
View full abstract
-
Tadashi OGATA, Haruo KATSUMATA, Sigeaki HAYASHI
1998 Volume 1998 Issue 49 Pages
88-90
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Hiroei KANNO, Ryoso HONKURA
1998 Volume 1998 Issue 49 Pages
91-95
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Undescribed diseases occurred on Malabar nightshade (
Basella rubra L.), parsley (
Petroselinum crispum Nym.), bishop's weed (
Ammi majus L.) and blue lace. flower (
Didiscus caeruleus DC.) in Miyagi Prefecture in 1997. Pathogenicity of isolates obtained from all the diseased plants to each host plant was demonstrated by inoculation and all of the isolates were identified as
Botrytis cinerea Persoon: Fries on the basis of morphological and cultural characteristics. This is the first report of gray mold on Malabar nightshade, parsley, bishop's weed and blue lace flower in Japan.
View full abstract
-
Harukuni HORITA
1998 Volume 1998 Issue 49 Pages
96-99
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Akiyasu IITOMI
1998 Volume 1998 Issue 49 Pages
100-101
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
The trend of yearly density fluctuations in the planthopper and the factors causing these fluctuations were analyzed with light trap data recorded from 1941 to 1997 at nine points in Akita prefecture, Northern Japan. The number of adult caught by light traps in the coastal area was larger than that in inland area. Increasing rates of the numbers between July and August were lower after middle of the 1970's than before. The rates between August and September were stable except 1965-73 years when the rates were continuously low. Lower increasing rates observed together with higher and later immigrations.
View full abstract
-
Yasuhiko KONNO
1998 Volume 1998 Issue 49 Pages
102-104
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Mating-choice and host preference tests were carried out in the rice (
Oryza sativa)-feeding (RF) and water-oat (
Zizania latifolia)-feeding (WOF) types of
Chilo suppressalis W. The mating-choice tests revealed that matings occurred not only with in the same type, but also between the two types. However, the peaks of mating-time of females were different, i.e., that of the RF type was 3 hr earlier than that of the WOF type. The host preference tests revealed that females of both types have a tendency to select their own host for oviposition.
View full abstract
-
Yasuhiko KONNO, Kiyoshi DOMON
1998 Volume 1998 Issue 49 Pages
105-108
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Susceptibility to fenitrothion, carboxylesterase activity (substrate:α-naphthyl acetate) and carboxylesterase isozyme pattern in the rice stem borer,
Chilo suppressalis Walker, collected from Yamagata Prefecture were studied. Among four strains tested, three strains showed high levels of fenitrothion resistance, and there was a positive relationship between the resistance and carboxylesterase activity. Isoelectrofocusing revealed that a single carboxylesterase isozyme (pI=5.2) was preferencially observed in the three resistant strains.
View full abstract
-
Takashi KIDOKORO, Yoshinori KONDOH
1998 Volume 1998 Issue 49 Pages
109-112
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Youhei YAZAWA, Takashi KIDOKORO
1998 Volume 1998 Issue 49 Pages
113-116
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Yasuhiko KONNO
1998 Volume 1998 Issue 49 Pages
117-120
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Ratio of brown, green and red types of female
Oxya yezoensis was researhed every week in Akita Prefecture from August to November in 1997. The ratios of each type were kept constant, i.e., brown (ca. 70%), green (ca. 30%) and red (0-3%) type. With respect to adult size and susceptiblity to ethofenprox, there were no significant differences in the three color types.
View full abstract
-
Hiroshi TOGAWA, Toru MIZUKOSHI
1998 Volume 1998 Issue 49 Pages
121-123
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Concentration-mortality relationships using isoxathion, PAP, permethrin, cartap, diflubenzuron, and flufenoxuron against the garden pea leafminer,
Chromatomyia horticola, were determined by laboratory assay. Potted garden pea plants infesting young leafminer larvae were sprayed under a Potter tower. LC
50 were determined by the results of five days after treatment except diflubenzuron (seven days after treatment). Isoxathion and cartap gave high mortality and the LC
50 were 87.8 and 267.6ppm, respectively. The LC
50 of flufenoxuron was high as 173.6ppm, but the mortality rate was not raised more than 70% and the LC
95 was low as 1370.1ppm. Susceptibility to the other insecticides was all low.
View full abstract
-
Toru MIZUKOSHI
1998 Volume 1998 Issue 49 Pages
124-128
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Male moths of the stone leek miner,
Acrolepiopsis sapporensis, are caught by the synthetic sex pheromone trap of the diamondback moth,
Plutella xylostella, because they might utilize the same sex pheromone components. Recently author found that the daily pheromone trap cathes of
A. sapporensis coincided with that of
P. xylostella, or the black cutworm,
Agrotis ipsilon. P. xylostella and
A. ipsilon cannot overwinter in Hokkaido, and they are well known as long-range migrant species. Although
A. sapporensis has not considered to be migrants, this peculiar phenomenon indicate the possibility of longrange migration of
A. sapporensis.
View full abstract
-
Kakumasa ONODERA, Akeo IWASAKI
1998 Volume 1998 Issue 49 Pages
129-133
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Akeo IWASAKI, Kakumasa ONODERA, Katsuhiro FURUKAWA
1998 Volume 1998 Issue 49 Pages
134-139
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Masashi KAKIZAKI, Hajime SUGIE
1998 Volume 1998 Issue 49 Pages
140-142
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Some kinds of trap using the synthetic sex pheromone, (
z)-7, 15-Hexadecadien-4-olide, were tested for males capture of the yellowish elongate chafer,
Heptophylla picea. Numbers of males captured by traps were not affected by colors of trap, and were not affected by diam. of water pan. However, trap with vertical plate was shown to be effective for males capture.‘Kogane call’ trap and ‘SE Funnel’ trap were to be useful for males capture.
View full abstract
-
Masashi KAKIZAKI
1998 Volume 1998 Issue 49 Pages
143-145
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Seasonal occurrence of male adults of the yellowish elongate chafer,
Heptophylla picea Motschulsky, were investigated by the pheromone trap using the synthetic sex pheromone, (
Z)-7, 15-Hexadecadien-4-olide, on the field of the blueberried honeysuckle,
Lonicera caerulea L.
var. emphllocalyx Nakai (Caprifoliaceae), and larch forest. Seasonal occurrence of male adults were varied on the berry field in some years, and also between the berry field and larch. The sex pheromone trap was usefull for the investigation as a simple monitoring method.
View full abstract
-
Akeo IWASAKI
1998 Volume 1998 Issue 49 Pages
146-149
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Release experiments of adult tarnished plant bug,
Lygus rugulipennis Poppius, to immature adzuki bean (
Phaseolus angularis L.) pods in several bean growing stages were done in 1997. The result showed that full-lengthened pods with small, still growing seeds are highly susceptible to infestation of the adult bug. Pods with more grown seeds are less susceptible.
In 1997, the number of adult bugs caught by sweep net in adzuki bean field increased during September, and number of susceptible pods decreased in early to middle September. Major period of infestation was thus considered to be late August to early September.
View full abstract
-
Koji SAKURAI, Masahiko KUWAHARA
1998 Volume 1998 Issue 49 Pages
150-152
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Yumiko UMETSU, Toshimitsu NAGANO
1998 Volume 1998 Issue 49 Pages
153-155
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Toshio MASUDA
1998 Volume 1998 Issue 49 Pages
156-160
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Hiroaki OKADA
1998 Volume 1998 Issue 49 Pages
161-163
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Larvae of yellow striped flea beetle,
Phyllotreta striolata Fabricius, were reared with four diets: fresh leaves of a radish (Raphanus sativus) and Chinese cabbages (
Brassica campestris and
Brassica. rapa), and fresh roots of a radish (
R. sativus). The larvae became adults 17 (on Chinese cabbage leaves)-20 days (on radish roots) after hatching at 25°C. The survival rate of the larvae was 85 (on radish leaves)-100%(on radish roots). The difference in the diet type except radish leaves had no significant effect on the adult body size in both sexes.
View full abstract
-
Shunichi SHIBUYA, Mie TAKEUTI
1998 Volume 1998 Issue 49 Pages
164-166
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
Trapping tests for western flower thrips,
Frankliniella occidentalis carried out using, yellow, blue and pink boards prior to flowering period in a Chrysanthemum. More adult thrips were trapped on pink, blue than yellow. Most effective and stable color for attracting F. occidentalis was pink. The rate of female was the highest on pink, next on blue. On yellow it was the lowest. As the females of this anthophilous insect looks for the pollen and oviposition site, they pay attention to the more vivid color that the chroma is higher. The pink that the chroma is the highest was most attractive to the female adult to be oviposition period.
View full abstract
-
Toshimichi OKUBO
1998 Volume 1998 Issue 49 Pages
167-169
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Akihiro ARAKAWA, Kazuhiro OKAZAKI
1998 Volume 1998 Issue 49 Pages
170-172
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Ken FUNAYAMA
1998 Volume 1998 Issue 49 Pages
173-174
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Masatake SASAKI, Keizo ITO
1998 Volume 1998 Issue 49 Pages
175-176
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Masatake SASAKI, Keizo ITO
1998 Volume 1998 Issue 49 Pages
177-179
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS
-
Tsutomu HASEGAWA, Nobuo YAMASHITA, Kazuo IWANE
1998 Volume 1998 Issue 49 Pages
180-184
Published: November 30, 1998
Released on J-STAGE: August 11, 2011
JOURNAL
FREE ACCESS