ANNUAL REPORT OF THE SOCIETY OF PLANT PROTECTION OF NORTH JAPAN

Online ISSN : 2185-4114
Print ISSN : 0368-623X
ISSN-L : 0368-623X

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Issue 45 Pages 1-

Volume 1994, Issue 45

Displaying 1-50 of 63 articles from this issue

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Recent Oversea Trend in Epidemics and Studies of Rice Blast Dise

Hajime KATO

1994 Volume 1994 Issue 45 Pages 1-2
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.1

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Some Characteristic Occurrence of Rice Blast Disease on the Paddy Field Reduced Pesticide in 1993

Kuniaki TSUKIJI, Ryoji KAWAMURA, Ikuo ONODERA

1994 Volume 1994 Issue 45 Pages 3-5
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.3

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The Outbreak of Rice Blast Disease and its Related Factors in Miyagi Prefecture, 1993

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
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.6

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The Outbreak of Rice Blast Disease and its Related Factors in Miyagi Prefecture, 1993

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
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.10

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A Computer Simulation Model for Rice Sheath Blight Disease

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
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.14

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Influence of Cultural Conditions in Nursery Bed on Occurrence of Bacterial Seedling Blight of Rice

Toru TAKEUCHI

1994 Volume 1994 Issue 45 Pages 17-20
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.17

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A Method for Testing the Effect of Seed Disinfection for Bacterial Seedling Blight of Rice

Toru TAKEUCHI

1994 Volume 1994 Issue 45 Pages 21-26
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.21

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Influences of Seed Disinfectant on the Growth of Seedling originated from Hull-cracked Rice

Akemi KIKUTA, Toshio OIKAWA

1994 Volume 1994 Issue 45 Pages 27-28
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.27

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Chracters of Rice Seed Samples produced on 1993 and Methods of Seed Disinfection for Seedling Culture

Katsuhiko CHIBA, Fusaharu NAKATANI

1994 Volume 1994 Issue 45 Pages 29-31
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.29

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A Simple Method for Monitoring the Sensitivity of Erysiphe graminis f. sp. tritici to Triadimefon

Motosige SIMIZU

1994 Volume 1994 Issue 45 Pages 32-34
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.32

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Outbreak of Wheat Scab caused by Fusarium nivale and Yield Loss of Winter Wheat in Tokachi, Hokkaido

Shinji YASUOKA

1994 Volume 1994 Issue 45 Pages 35-37
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.35

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Some Properties of Disease Supressiveness Induced by Root-rotten Sugarbeet

Shigeo NAITO, Toshiya SUGIMOTO

1994 Volume 1994 Issue 45 Pages 38-42
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.38

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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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Occurrence of Root Rot of Chinese Yam, Caused by Rhizoctonia solani Kuhn, in Hokkaido

Shizuka OZAWA, Hidehumi OBATA, Shinji YASUOKA, Fumio TANAKA

1994 Volume 1994 Issue 45 Pages 43-44
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.43

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Some Cultural Charactristics and Pathogenicity to Alfalfa of Some Helicobasidium mompa Isolates

Akira SAYAMA, Kiroku KOBAYASHI, Akira OGOSHI

1994 Volume 1994 Issue 45 Pages 45-48
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.45

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A Disorder Resembling Dwarf Disease of Soybean That Is Induced by Low Temperatures

Seiji KANEMATSU, Ken-ichiro HONDA, Yoshiro MIKOSHIBA, Shun-ichi MIYAI, ...

1994 Volume 1994 Issue 45 Pages 49-52
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.49

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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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A Relationship between Time of Aphid-Control and Incidence of Soybean Dwarf Disease

Toshimichi OKUBO

1994 Volume 1994 Issue 45 Pages 53-55
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.53

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Control of Soybean Dwarf Disease by Spraying of Calcium Carbonate

Toshimichi OKUBO

1994 Volume 1994 Issue 45 Pages 56-57
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.56

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Searching for Phytophthora Blight-resistant Sweet Pepper Stock

Yoshikazu ANDO, Yasumori AKASAKA, Fusaharu NAKATANI

1994 Volume 1994 Issue 45 Pages 58-59
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.58

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Decreased Sensitivity of Powdery Mildew of Cucumber by Sphaerotheca fuliginea to Fungicides

Shigemi KIKUCHI, Shouichi YUUKI

1994 Volume 1994 Issue 45 Pages 60-61
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.60

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Occurrence of Fusarium Wilt of Melon Caused by Fusarium oxysporum f. sp. melonis Which Shows Different Symptoms and Parasitism in Hokkaido

Yasuhiro IWATA, Osamu TAMURA, Akio SUMINO

1994 Volume 1994 Issue 45 Pages 62-66
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.62

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Occurrence of Necrosis of Edible Lily (Lilium leichtlinii var. mazimowiczii Baker) Caused by Mixed Infection of Tulip Breaking Virus (TBV) and Unidentified Filamentous Virus in Hokkaido

Takashi HAGITA, Jun SASAKI

1994 Volume 1994 Issue 45 Pages 67-71
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.67

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Biocontrol of Fusarium Wilt of Spinach by using Nonpathogenic Fusarium oxysporum

2. Investigation of Inoculation Methods

Kazunori KATSUBE, Yasumori AKASAKA, Fusaharu NAKATANI

1994 Volume 1994 Issue 45 Pages 72-75
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.72

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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 (10⁴ 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 (1.7×10⁶/g of soil) were transplanted to the infested soil.

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Effects of Soil Sterilization with Hot Water Injection on Clabroot of Chinese Cabbage Caused by Plasmodiophora brassicae

Shigeru MORIYA, Kazuhiro WATANABE, Kazufumi NISHI

1994 Volume 1994 Issue 45 Pages 76-79
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.76

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Bacterial Rot of Parsley (Petroselinum crispum Nym.), Caused by Pseudomonas marginalis pv. marginalis (Brown 1918) Stevens 1925

Shigeru OSADA

1994 Volume 1994 Issue 45 Pages 80-83
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.80

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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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Infection Route of Cucumber Mosaic Virus in Gentian

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
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.84

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Comparison of Two Isolates of Cucumber Mosaic Virus (CMV) from Gentian Plant in Iwate Prefecture

Piyasak CHAUMPLUK, Yukiko SASAKI, Akira SAITOH, Hiroyuki KOIWA, Yasufu ...

1994 Volume 1994 Issue 45 Pages 88-92
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.88

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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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Symptom of Leaf Spot on Gentian (Gentiana spp.) Caused by Alternaria sp.

Yasumori AKASAKA, Yosikazu ANDO, Husaharu NAKATANI

1994 Volume 1994 Issue 45 Pages 93-95
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.93

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Effective Control of Flower Rot of Gentian caused by Ciborinia sp. using Iminoctadine Triacetate (BEFRAN LF25)

Kazuhiko KAJI, Kiichi TAIRAKO, Takahiro SONODA

1994 Volume 1994 Issue 45 Pages 96-99
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.96

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Occurrence of Bacterial Soft Rot of Calla Incited by Erwinia carotovora subsp. carotovora in Hokkaido Prefecture

Harukuni HORITA

1994 Volume 1994 Issue 45 Pages 100-103
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.100

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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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Bacterial Stem Rot of Chrysanthemum Caused by Erwinia chrysanthemi in Hokkaido Prefecture

Harukuni HORITA

1994 Volume 1994 Issue 45 Pages 104-107
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.104

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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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Seasonal Prevalence of Chrysanthemum White Rust in Miyagi Prefecture

Makiko SUTO, Chieko TAKAHASHI

1994 Volume 1994 Issue 45 Pages 108-109
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.108

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Causal Agents of Pear Fruit Rot and Its Control

Norio NAKAZAWA, Koji FUJITA, Yoshifumi FUKUSHI

1994 Volume 1994 Issue 45 Pages 110-113
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.110

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Analysis of a Regional Characteristic for Japanese Pear Scab Development by Utilization of the Weather Data Obtained from AMEDAS (Automated Meteorological Data Acquisition System)

Tadashi OGATA, Keizoh ITO, Masafumi OCHIAI

1994 Volume 1994 Issue 45 Pages 114-116
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.114

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Susceptibility to Gum-soaked Canker in Sweet Cherry Varieties

Shoichi YUUKI, Shigemi KIKUCHI, Kiyoshi DOMON

1994 Volume 1994 Issue 45 Pages 117-121
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.117

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Difference of Apple Cultivers in Infection with Valsa Canker thruogh Fruit PedicelesLeft behind on Bourse Following after Hand-thinning

Kinsuke YUKITA

1994 Volume 1994 Issue 45 Pages 122-125
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.122

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Effects of Organic Fertilizers on the Occurrence of Apple Canker with a Special Reference to the Time of Application

Hitoshi IWAYA

1994 Volume 1994 Issue 45 Pages 126-128
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.126

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An Improvement of a Mud Treatment by Adding Bentonite to Control Apple Canker

Masahiko OSANAI, Nobuyuki OYAMA

1994 Volume 1994 Issue 45 Pages 129-131
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.129

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Attack Timing and Control Threshold of the Sorghum Plant Bug, Stenotus rubrovittatus Matsumura (Hemiptera: Miridae)

Sigeyuki IIMURA

1994 Volume 1994 Issue 45 Pages 132-136
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.132

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Relation between the Stage of Rice Plant and the Occurrence of Pecky Rice Caused by Sorghum Plant Bug, Stenotus rubrovittatus (Matsumura) (Hemiptera: Miridae)

Masahide MIYATA

1994 Volume 1994 Issue 45 Pages 137-138
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.137

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Efficient Control of Rice Water Weevil, Lissorhoptrus oryzophilus (Coleoptera: Curculionidae) and Rice Leaf Beetle, Oulema oryzae (Coleoptera: Chrysomelidae) Based on the Control Threshold

Sigeru SUZUKI, Sigeyuki IIMURA, Masaki ITOU, Kuniaki TUKIZI, Ryouzi KA ...

1994 Volume 1994 Issue 45 Pages 139-141
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.139

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On the Method for Testing Insecticidal Susceptibility of Rice Leaf Beetle, Oulema oryzae (Coleoptera: Chrysomelidae) by Topical Application

Takashi KIDOKORO

1994 Volume 1994 Issue 45 Pages 142-144
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.142

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Susceptibility of the Rice Leaf Beetle, Oulema oryzae (Kuwayama) (Coleoptera: Chrysomelidae) to the Insecticides in Miyagi Prefecture

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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DOIhttps://doi.org/10.11455/kitanihon1966.1994.145

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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, LD₅₀, 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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Difference of Seasonal Prevalence of the Seedcorn Fly, Delia platura (Diptera: Anthomyiidae) between Surveyed by the Kairomone Trap and the Fish Meal Trap in Sapporo, Hokkaido

Osamu SAITO

1994 Volume 1994 Issue 45 Pages 147-149
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.147

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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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New Record of the Black Bean Aphid, Aphis fabae fabae Scopoli (Homoptera: Aphididae) from Hokkaido

Hidenori TORIKURA

1994 Volume 1994 Issue 45 Pages 150-152
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.150

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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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Yield Loss of Potato by the Infestation of Melon Aphid, Aphis gossypii (Homoptera: Aphididae)

Hidenori TORIKURA

1994 Volume 1994 Issue 45 Pages 153-155
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.153

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Seasonal Prevalence of Greenhouse Whitefly, Trialeurodes vaporariorum (Westwood) (Homoptera: Aleyrodidae) in the Potato Field in Hokkaido

Tadafumi NAKATA

1994 Volume 1994 Issue 45 Pages 156-157
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.156

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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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Tolerance of the Diamondback Moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae), to Low Constant Temperature

Osamu SAITO

1994 Volume 1994 Issue 45 Pages 158-159
Published: November 30, 1994
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DOIhttps://doi.org/10.11455/kitanihon1966.1994.158

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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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Hibernation of the Diamondback Moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae), in the Field or in the Greenhouse at Sapporo, Hokkaido, 1984-1986

Osamu SAITO

1994 Volume 1994 Issue 45 Pages 160-162
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.160

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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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Low Susceptibility of the Diamondback Moth, Plutella xylostella (Lepidoptera: Yponomeutidae), to Chitin Synthesis Inhibitor in the Oshima District of Hokkaido in 1993

Toru MIZUKOSHI

1994 Volume 1994 Issue 45 Pages 163-167
Published: November 30, 1994
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.163

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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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Control of the Diamondback Moth (Plutella xylostella) (Lepidoptera: Yponomeutidae) by Egg-parasitoids (Trichogramma)

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
Released on J-STAGE: August 11, 2011

DOIhttps://doi.org/10.11455/kitanihon1966.1994.168

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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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