Nematological Research (Japanese Journal of Nematology)
Online ISSN : 1882-3408
Print ISSN : 0919-6765
ISSN-L : 0919-6765
Volume 23, Issue 1
Displaying 1-6 of 6 articles from this issue
  • Kazutoshi NAKASONO, Jerome T. GASPARD, Yasushi TATEISHI
    1993 Volume 23 Issue 1 Pages 1-9
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Kidney bean, sweet potato, spinach, and then sweet potato were grown in sequence in pots with soil infested with Meloidogyne incognita (Mi) and with or without an application of Pasteuria penetrans (Pp) endospores under high and low soil temperature vinyl house conditions for two years to measure the effects of temperature on Pp and Mi population dynamics. At high soil temperature Pp endospore numbers in soil increased from an initial application of 6.6×104/g soil to 18, 34, and 127×104 after sweet potato, spinach, and sweet potato, respectively, while at low soil temperature Pp soil endospore numbers were 5, 16, and 12×104 in the same cropping order. Population changes of Mi juveniles were not significantly affected by the presence of Pp soil endospores at both high and low soil temperatures. A centrifugal extraction method for enumerating Pp soil endospore numbers is also briefly described.
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  • Takanori KASUMIMOTO, Ruriko IKEDA, Hiroshi KAWADA
    1993 Volume 23 Issue 1 Pages 10-18
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Pasteuria penetrans, an obligate parasite of Meloidogyne incognita was applied to field soil infested with M. incognita to measure the suppressive affect of P. penetrans on M. incognita numbers during three consecutive plantings of cherry tomato. The field soil, initially infested with 225 J2/20 g soil, was mixed with or without a P. penetrans powder formulation to obtain 0, 104, 3×104, 105, 3×105 and 106 spores/g soil. The treated soil in 11 cm pots were then used for three consecutive cherry tomato plantings that were transplanted as seedlings and maintained in a greenhouse 63, 62 and 60 days respectively for the three plantings and harvested. There was a dose response for number of juveniles (J2)/20 g soil, root gall index, number of spores/J2, % J2 with spores, spores produced/root system, and total plant weights. At the first harvest only soil receiving 106 spores/g soil suppressed J2 numbers significantly but the dose response increased with each harvest. At the third harvest, J2 numbers and the root gall index were significantly reduced in all treatments inoculated with P. penetrans with a 90% reduction in J2 numbers at the 106 spore level. The results suggest 1) the suppressive affect of P. penetrans on M. incognita is dependent on the density of spores in soil, 2) at low spore densities, the suppressive affect is primarily due to reducing egg mass production and not on nematode mobility and/or root penetration, 3) at high spore densities, J2 mobility and/or root penetration as well as egg mass production are reduced, and 4) soil spore densities that result in close to 100% of J2 with spores attached are necessary for maximum beneficial affect.
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  • Takayuki MIZUKUBO, Yukio TOIDA, Somkuan KEEREEWAN
    1993 Volume 23 Issue 1 Pages 19-27
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Five species of the genus Tylenchorhynchus found from crop fields in Thailand are measured, described and illustrated as follows: T. annulatus, T. curvus, T. divittatus, T. leviterminalis and T. maqbooli nom. nov.(syn. T. solani (MAQBOOL, 1982) sensu FORTUNER & Luc, 1987). Tylenchorhynchus maqbooli and T. leviterminalis are the first record for the species in Thailand.
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  • Eizo KONDO, Rahman RAZAK
    1993 Volume 23 Issue 1 Pages 28-36
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Infectivity of Steinernema carpocapsae strain All on larvae of the mango shoot borer Rhytidodera simulans, a serious pest of mango trees in Malaysia, was investigated under laboratory conditions. When the insect larvae were placed individually in a 6-cm-d petri dish containing 5g of moistened mango sawdust with 0, 10, 100, 1, 000 or 10, 000 infective juveniles (J3), the nematode caused insect death 2 days or later after inoculation at the inoculum levels higher than 1, 000 J3 and then grew and reproduced in the insect cadavers. Most of the insects which escaped nematode infection or those died later made gallery-like tunnel along the petri dish wall. About 1/2 to 1/6 individuals of insects introduced in the galleries artificially made in mango cut-branches were infected when the branches were either injected through small side holes reaching the galleries or sprayed over the holes with 1 m/l of nematode suspension containing 10, 000 or 100, 000 J3. The nematode infection on R. simulans larvae in galleries was found to be greatly affected by the insect feeding behavior.
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  • Nobuo OGURA
    1993 Volume 23 Issue 1 Pages 37-38
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1993 Volume 23 Issue 1 Pages 39-43
    Published: July 29, 1993
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
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