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Toshio OKU
1993 Volume 1993 Issue 44 Pages
1-5
Published: November 30, 1993
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6. Effect of Disease Development on Yield Losses
Keiji OHTA, Hitoshi SAITO
1993 Volume 1993 Issue 44 Pages
6-7
Published: November 30, 1993
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Chieko TAKAHASHI, Sigeru OSADA
1993 Volume 1993 Issue 44 Pages
8-9
Published: November 30, 1993
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Ryoso HONKURA, Shigeru OSADA
1993 Volume 1993 Issue 44 Pages
10
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Shigeru OSADA
1993 Volume 1993 Issue 44 Pages
11-13
Published: November 30, 1993
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The effect of five fungicides, Diclomezine, Validamaycin A, Flutolanil, Pencycuron and Mepronil on controlling a rice sheath spot disease caused by
Rhizoctonia oryzae was tested in the paddy field. Volume of 180
l /10a of each fungicide was applied by auto-sprayer from 3 days before the heading date of rice to 7 days after. Diclomezine was the most effective on decreasing the disease occurrence with the prescribed concentration.
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Chieko TAKAHASHI
1993 Volume 1993 Issue 44 Pages
14-15
Published: November 30, 1993
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Hiromitsu FURUYA, Hirotaka TAKANO, Satoru INOUE, Tsutomu MATSUMOTO
1993 Volume 1993 Issue 44 Pages
16-19
Published: November 30, 1993
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The occurrence of both the fast growing ‘even-margined’ type and the slow growing ‘feathery-margined’ type of eyespot pathogen,
Pseudocercosporella herpotrichoides (Fron) Deighton, was confirmed in Japan based mainly on the investigations of cultural characteristics. The two types may correspond respectively to W-type and R-type (5).
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Shigeo NAITO, Takeo YAMAGUCHI, Toshiya SUGIMOTO, Yoshihisa HOMMA
1993 Volume 1993 Issue 44 Pages
20-23
Published: November 30, 1993
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A study was carried out on viability and pathogenicity of 52 air-dry isolates of
Rhizoctonia spp. which were maintained on barleys' grains at-20°C during 10 years. Thirty-nine isolates of
R. solani, from anastomosis groups (AGs) 1 through 5, were all viable as their infested grains were placed on a nutrient agar. The isolates in those 5 AGs remained hihgly pathogenic to sugar beet seedlings up to now, whereas some isolates in AG 6 and AG BI lost their viability. All the isolates of binucleate
Rhizotonia spp. which belonged to either AG B, C, D, E or K remained viable on the infested grains.
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Mitsuru SAYAMA, Yoshihisa HOMMA
1993 Volume 1993 Issue 44 Pages
24-27
Published: November 30, 1993
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This paper described the methods for detecting cystsori of
Polymyxa betae, a vector of BNYVV, from infested soil, for estimating the number of the cystsori in soil, and for separating the cystsori from infected rootlets of sugar beet, and the relation between the infection rate with
P. betae and the decrease in sugar content. The cystsori in infested soil were directly detected by floating in 25% hydrogen peroxide solut ionafter wet sieving of the soil. Five percent of the cystsori were recovered from artificiallyinf ested soil by this method. Most-probable-number-technique was applied to estimate the number of propagule of
P. betae by deciding the infection with ELISA. One to 3.3 units of infection/ml of soil were estimated in the severely infested soil. The infection degree with the cystsori in infected rootlets of sugar beet was estimated by observing the number of the cystsori in more than 200 small pieces of rootlets of individual under microscope. High correlation was observed between the infection degree by this method and the decrease of sugar content. Partially purified cystsori were separated from infected rootlets of sugar beet by homogenizing, wet sieving, suspending in 1.0 M sucrose solution, and then centrifuging.
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Fumio TANAKA, Harukuni HORITA, Akio TANII
1993 Volume 1993 Issue 44 Pages
28-30
Published: November 30, 1993
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Takao MITSUEDA, Maria José D'Ávila CHARCHAR
1993 Volume 1993 Issue 44 Pages
31-35
Published: November 30, 1993
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Recently stem rot of bean has been increasing at the irrigated fields in Cerrado region of Brazil. This disease is, however, relatively new, so the ecology of the pathogen has not been studied well in Brazil. In this study, two methods of infection were found out, namely one is by ascospores and the other is caused with mycelia developed from sclerotia in the field soil. Especially the later is very important at the bean fields in DF (District Federal). In these fields, although apothecia are not found out, the disease occurs severely. But authors couldn't clear the reasons why the sclerotia don't produce the apothecia in the field of DF.
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Takasi NAKAJIMA, Takao MITSUEDA, Maria José D'Ávila CHAR ...
1993 Volume 1993 Issue 44 Pages
36-38
Published: November 30, 1993
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In vitro studies were carried out to identify causal fungi of Sclerotinia diseases in Cerrado region in Brazil. Temperature responses of mycelial growth of Sclerotinia sp. collected in Cerrado on P D A were similar to Japanese isolate of
S. sclerotiorum SB-1 but not to that of
S. trifoliorum Y W-4. In dual culture the mycelia of isolates in Cerrado and S. sclerotiorum SB-1 intermingled freely without the formation of a brown zone in the regions of association on P D A medium, being in good agreement with Wong and Willetts' reaction type (1). On the other hand, a white zone could be seen between mycelia of isolates in Cerrado and of
S. trifoliorum Y W-4. As a result, all the isolates of
Sclerotinia sp. collected in Cerrado region should be identified as Sclerotinia sclerotiorum.
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Yasuo OHTO, Takashi NAKAJIMA, Shigeo NAITO, Yasumori AKASAKA, Fusaharu ...
1993 Volume 1993 Issue 44 Pages
39-40
Published: November 30, 1993
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In 1991 and 1992, verticillium wilt of soybean was found in the northern part of Iwate prefecture. The symptoms were the interveinal necrosis and the wilt of the leaves. Vesculars of stems and petioles discolored. And
Verticillium dahliae Klebahn were isolated from roots, stems and petioles, that were pathogenic to soybean. In Japan, this disease was reported only in Gunma prefecture in 1986. This is the first report of verticillium wilt disease on soybean in Tohoku district and so in Iwate prefecture.
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Harukuni HORITA, Kayo SHIRAI, Fumio TANAKA
1993 Volume 1993 Issue 44 Pages
41-42
Published: November 30, 1993
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Toru MIZUKOSHI, Yozo HASHIMOTO, Tsutomu HANADA
1993 Volume 1993 Issue 44 Pages
43-45
Published: November 30, 1993
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The greatest infection period of soybean dwarf virus (SDV) in kidney beans was concentrated in the three weeks from middle of June to early July in the Tokachi district of Hokkaido. This period of infection indicates that of migration of
Aulacorthum solani alate. In this report, the control effect of foliar application in the SDV infection period and the most effective method were investigated. The insedicides, fention (MPP) and ethofenprox, were tested. The method, three times application at seven-day intervals from the early infective stage, was the most effectiveness.
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Toshimichi OKUBO
1993 Volume 1993 Issue 44 Pages
46-48
Published: November 30, 1993
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Toshimichi OKUBO
1993 Volume 1993 Issue 44 Pages
49-52
Published: November 30, 1993
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Takashi SHIRAKAWA, Katsumi OZAKI, Kazuo TAKAHASHI
1993 Volume 1993 Issue 44 Pages
53-55
Published: November 30, 1993
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The disease similar to tomato pith necrosis was detected on the tomato cultivar Momotarou at Morioka, Iwate prefecture. Diseased tomato plants developed black necrotic lesions on petioles and stems, and pith necrosis. Bacteria isolated from fresh lesions developed same symptoms on tomato plants, but those pathogenisity were weak. Those bacteria were identified as
Pseudomonas fluorescens Migula 1985 biovar II.
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Yohachro HONDA, Kouji YOSHIDA, Tadanori GOTO
1993 Volume 1993 Issue 44 Pages
56-58
Published: November 30, 1993
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Katsumi OZAKI, Kazuo TAKAHASHI
1993 Volume 1993 Issue 44 Pages
59-60
Published: November 30, 1993
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Seventeen spinach varieties including 13 commercial cultivars and 4 newly breeded liens were tested for their resistance to race 4 of
Peronospora spinaciae Laubert. A marked difference was observed in the resistance among the varieties. Particularly, the breeded varieties ‘Konbatto’, ‘Hokushu’, ‘Jhdka’ and ‘NSP-901’ were resistant to race 4. The commercial varieties were susceptible to race 4.
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Yasumori AKASAKA, Toshiaki TAKEHARA, Yukiomi KOMOTO, Katsuto KUNIYASU
1993 Volume 1993 Issue 44 Pages
61-64
Published: November 30, 1993
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Seigo ODASHIMA, Takashi SIRAKAWA, Tomio FUKAYA, Katsumi OZAKI, Nobuyuk ...
1993 Volume 1993 Issue 44 Pages
65-67
Published: November 30, 1993
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The disease similar to bacterial leaf spot occurred on welsh onin at southern part of Akita prefecture. The causal bacteria isolated from fresh symptom caused similar symptom on welsh onion by single niddie inoculation. By examination of various bacterial characters, these bacteria were identified to
Pseudornon syrigae. This report is the first report of welsh onion bacterial leaf spot caused by
P. syringae in Tohoku district.
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Shigeru OSADA, Kaoru SATO, Hiroei KANNO, Toshihito HABU
1993 Volume 1993 Issue 44 Pages
68-70
Published: November 30, 1993
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An outbreak of crown rot of forced strawberry (
Fragaria × ananassa Duchesne) cv. Reiko was recorded in Miyagi prefecture in 1992. Diseased plants showed wilting and dying with variable levels of vascular necrosis and red-brown.
Phytophtora sp. was isolated on water agar from necrotic crown tissues. The isolates were identified as
P. cactorum from characteristics sporangia and sexorgans. The cultivar Reiko was more susceptible than the cultivar Nyohou to disease. This is the first report to confirm the occurrence of crown rot (vascular collapse) of strawberry in the northern Japan.
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Harukuni HORITA
1993 Volume 1993 Issue 44 Pages
71-73
Published: November 30, 1993
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In 1992, bacterial disease characterized by leaf marginal legion of Chrysanthemum was shown to be incited by
Pseudomonas cichorii (Swingle) Stapp in Hokkaido. Isolates were pathogenic to chrysanthemum by spray inoculation. The causal organism produced a fluorescent pigment on King's B medium and was arginine dihydrolase negative, gelatin liquefaction negative and oxidase positive, which identified it as
P. cichorii. It was the first record of bacterial leaf spot disease of chrysanthemum in Hokkaido.
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Kinsuke YUKITA
1993 Volume 1993 Issue 44 Pages
74-76
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Masahiko OSANAI
1993 Volume 1993 Issue 44 Pages
77-80
Published: November 30, 1993
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Takeshi HIRARAGI, Sigeru SUZUKI, Hideo OIKAWA
1993 Volume 1993 Issue 44 Pages
81-82
Published: November 30, 1993
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3. Seasonal Changes in the Susceptibility of Fruit to the Apple Ring Rot Fungus
Tadashi OGATA, Masafumi OCHIAI
1993 Volume 1993 Issue 44 Pages
83-85
Published: November 30, 1993
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II. Effect of Feeding on Yield during the Period before 32days to Heading
Kiyohide ISHIGURO
1993 Volume 1993 Issue 44 Pages
86-88
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Akiyasu IITOMI
1993 Volume 1993 Issue 44 Pages
89-91
Published: November 30, 1993
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Utility of a simple rice-hill trap for catching the migrants of
Sogatella furcifera Horváth was studied in Akita of Northern Japan, 1992. Ten rice hills were trans-planted as a trap in length of 69 cm and width of 34 cm to a point where located in coastal area of the district and was 500 m distant from paddy fields. The number of the insect on the trap fluctuated with a place of the rice hills and decreased at the rate of about 58% per day, which was 5 times of common fields. Thus the time to increase the number of the insect might identify as migration time, but no correlation was observed between both densities on the trap and the fields.
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Katuhiro FURUKAWA, Yasuyoshi AKIYAMA, Sigeyoshi TAKAKURA
1993 Volume 1993 Issue 44 Pages
92-94
Published: November 30, 1993
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Masahiko SATO, Tokumitsu NIIYAMA, Mariko OHARA, Ryosuke TSURUTA, Akiya ...
1993 Volume 1993 Issue 44 Pages
95-97
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Sigeyuki IIMURA
1993 Volume 1993 Issue 44 Pages
98-100
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Masahide MIYATA
1993 Volume 1993 Issue 44 Pages
101-102
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2. Control by Application of Systemic Insecticide
Shunichi SHIBUYA
1993 Volume 1993 Issue 44 Pages
103-104
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Katsuyuki KOHNO
1993 Volume 1993 Issue 44 Pages
105-106
Published: November 30, 1993
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The efficiency of three types of traps (light trap, molasses-baited trap, and hanging bucket trap offered by Sankei Chemical Co.) for the click beetle,
Melanotus senilis Candèze, was compared. The light trap consistently captured less beetles than the other two types of traps. The molasses-baited trap afforded higher number of female in catch than the hanging bucket trap, although the former was inferior to the latter in total number of beetles. These two types of traps were more promising than the light trap for monitoring the adult population of
M. senilis. In using hanging bucket trap, white and yellow ones were recommended because they attracted more beetles than black one.
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Katsuyuki KOHNO, Shunichi MIYAI
1993 Volume 1993 Issue 44 Pages
107-108
Published: November 30, 1993
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An experiment was conducted to evaluate food baits for sampling of wireworms. Baits tested were wheat seed, corn seed and potato tuber pieces. The mean number of wireworms attracted did not differ significantly from zero perhaps because of the small sample size. However, since the baiting technique detected much more wireworms than the simple soil sampling or the soil sampling around corn seedlings, it was judged to be the best method for sampling wireworms.
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Osamu SAITO
1993 Volume 1993 Issue 44 Pages
109-113
Published: November 30, 1993
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1. Apterae and Immature (Homoptera, Aphididae)
Hidenori TORIKURA
1993 Volume 1993 Issue 44 Pages
114-116
Published: November 30, 1993
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2. Alate viviparae (Homoptera, Aphididae)
Hidenori TORIKURA
1993 Volume 1993 Issue 44 Pages
117-119
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Hidenori TORIKURA
1993 Volume 1993 Issue 44 Pages
120-123
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Junichi KANEKO
1993 Volume 1993 Issue 44 Pages
124-126
Published: November 30, 1993
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In every year it is covered with snow from December to March at Hitsujigaoka, Sapporo City (43°30'N, 140°25'E). Of all the silver Y moth individuals which lived in a cabbage field (2a, 540 plants) at Hitsujigaoka, Sapporo at population density of 6 larvae per 25 plants in Decenmber 4th, 1991, 8 larvae were found to overwinter in April, 1992. No Asiatic common looper,
Autographa nigrisinga (Walker), closely related species of A.
gamma was found to overwinter at the same place.
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Yoichi KAZINO
1993 Volume 1993 Issue 44 Pages
127-131
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Yoichi KAZINO
1993 Volume 1993 Issue 44 Pages
132-134
Published: November 30, 1993
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Tokumitsu NIIYAMA, Masahiko SATO, Ikuo YOSHIDA
1993 Volume 1993 Issue 44 Pages
135-137
Published: November 30, 1993
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Akeo IWASAKI, Yoichi KAJINO
1993 Volume 1993 Issue 44 Pages
138-140
Published: November 30, 1993
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I. Aspects of Injury
Toru MIZUKOSHI, Toshiharu ARIMURA, Yoichi WATANABE
1993 Volume 1993 Issue 44 Pages
141-143
Published: November 30, 1993
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The spring seeding radish is a leading crop in the central region of the Oshima district of Hokkaido. In this region, circular feeding scars of about 10 urn in diameter on harvested radish have been observed from about 1985. Feeding scars were due to some species of carabid beetles. Percentages of injured radish in the fields damaged severely were from 50 to 70% in 1992.
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II. Dominant Species Causing Injury
Toru MIZUKOSHI
1993 Volume 1993 Issue 44 Pages
144-147
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Dominant species of carabid beetles causing circular feeding scars on spring seeding radish were determined by three methods. Fauna of carabid beetles in three severe damaged fields were observed by using pitfall traps. A large number of three species,
Anisodactylus signatus,
Pterostichus haptoderoides, and
Amara chalcites, were collected. For 17 species of carabid beetles, the degrees of injury were estimated by using the index of injury under at 30°C. Three species,
Poecilus caerulescens,
P. haptoderoides and
A. chalcites, injured severely on a block of radish. In release tests, former two species only made typical circular holes.
A. chalcites made two types of feeding scars, typical circlar holes and slight surface injury as well as that of the striped flea beetle,
Phyllotreta striolata. It was clarified that three species of carabid beetles mentioned above were determined as the dominant species causing injuly.
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Tomoko MURAI, Masahiro ISHITANI
1993 Volume 1993 Issue 44 Pages
148-150
Published: November 30, 1993
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Tadao ICHITA, Takehiko FUJIMURA
1993 Volume 1993 Issue 44 Pages
151-158
Published: November 30, 1993
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