Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
Volume 15, Issue 2
Displaying 1-11 of 11 articles from this issue
  • Makoto NAKAJIMA, Haruo YOSHIDA
    1971 Volume 15 Issue 2 Pages 51-55
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    The purpose of this study was to clarify the change in ultraviolet sensitivity to inhibition of melanin formation in the cuticle during an instar. Striped silkworms were exposed to ultraviolet light at various stages of the third instar. By exposure to ultraviolet light at the third instar, a marked inhibition of melanin formation occurred in the later instars. The inhibition of melanin formation was the strongest when larvae were exposed to ultraviolet light at about 70 percent of the age of the instar. Tyrosinase activity in the epidermis was also decreased by UV-irradiation. Furtheremore, it was proved that deleterious effects of ultraviolet light on both inhibition of melanin formation and decrease of tyrosinase activity were partially photoreactivable. Possible relations between inhibition of melanin formation and decrease of tyrosinase activity were discussed.
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  • Kisaku AKUTSU
    1971 Volume 15 Issue 2 Pages 56-62
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    A granulosis virus from Hawaii caused a highly virulent disease in Pieris rapae crucivora BOISDUVAL. When the eggs of P. rapae crucivora were laid on cabbage plants which had been contaminated with a granulosis virus, more than 51% of hatched larvae were killed by the virus in 6 to 8 days during their second- or early third-instar stage. From this it appears that they had become infected in first or early second instar stage. When the virus suspension obtained by macerating 80 diseased larvae was sprayed on 10a cabbage field, 78.3% of the fourth- and fifth-instar larvae were killed in 6 days and 79.5% in 12 days. Furthermore, the number of living larvae and pupae per 50 cabbage plants were very greatly reduced within 12 days. The leaf damage index in the virus treated plots was 39.0% as compared to 74.5% in the non-treated plots. If the virus was combined with Depterex or Endrin, the control was found to be more effective.
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  • Iwao TAKASE, Hideko TSUDA, Yoshifumi YOSHIMOTO
    1971 Volume 15 Issue 2 Pages 63-69
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    Studies were conducted to determine the hydrolysis, oxidation and persistence of disulfoton in upland silt loam autoclaved and non-autoclaved, sandy loam, sand, and in paddy soil. Insecticide residues were extracted with acetone and determined by gas liquid chromatography with flame thermionic detector. Disulfoton persisted in field soils as oxidative analogs. They were disulfoton sulfoxide and sulfone, but its oxygen analogs were slightly detected. They still had insecticidal activities. The rates of disulfoton oxidized to its oxygen analogs were a little higher in the paddy soil than in upland soil. It is suggested that this oxidation is somewhat caused by soil microorganisms. Disulfoton was translocated from the applied level to upper and lower level in soil and detected as the oxidative analogs.
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  • Eiji KAWASE
    1971 Volume 15 Issue 2 Pages 70-75
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    A microscopic examination of genus Nephotettix individuals which are collected in 1963 by Rinichi KAWASAKI and in 1967 by Isoko HATTORI in Thailand, revealed four distinguishable species for classifying as follows: N. impicticeps, N. apicalis, N. parvus, and N. malayanus. N. apicalis and N. parvus had many individual differences together with slightness of blackening in the female. The black submarginal band on the head of N. apicalis and N. parvus appeared between the compound eyes or between ocelli. In some of the two species, the black submarginal band disappeared in its middle part.
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  • Akira HASHIMOTO, Shozaburo KITAOKA
    1971 Volume 15 Issue 2 Pages 76-86
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    The shape and fine structure of the waxy substances secreted by scale insects appeared to be species characteristic, when examined under scanning electron microscope. In Lecanium horii, Icerya purchasi and Pseudaulacaspis pentagona the outermost surface of the eggs was covered with numerous waxy substances mostly in one- or two-pitch coil form. The egg sac of L. horii, Phenacoccus pergandei and I. purchasi constituted a mass of network structure with long-tubular waxy substances. It was also found that the waxy substances secreted on the dorsum of the male first instar larvae of Ericerus pela could be classified into two types, one the coil form and the other the long-tubular form, while the surface of the adult female was covered with numerous long-tubes only. The waxy substances secreted on the dorsum of the second instar larvae of Ceroplastes pseudoceriferus, C. japonicus, and C. rubens were found to be piled up, one layer plate upon the other, and they were observed in a regular net structure on the marginal area of the dorsum of C. pseudoceriferus and C. japonicus. In the first instar larvae of P. pentagona a pair of horn-shaped waxy substances and some thread-shaped waxy substances were observed on the body surface.
    Some of the chemical constituents of the waxes obtained from the egg sac, egg surface or body surface were determined by gas-liquid chromatography, and the relationship between structure and function of the waxes was discussed.
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  • Shoei OTSU
    1971 Volume 15 Issue 2 Pages 87-88
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1971 Volume 15 Issue 2 Pages 89-90
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    Download PDF (296K)
  • [in Japanese]
    1971 Volume 15 Issue 2 Pages 91-93
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1971 Volume 15 Issue 2 Pages 94-95
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1971 Volume 15 Issue 2 Pages 96-100
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    Download PDF (823K)
  • [in Japanese]
    1971 Volume 15 Issue 2 Pages 101-102
    Published: June 25, 1971
    Released on J-STAGE: February 12, 2009
    JOURNAL FREE ACCESS
    Download PDF (278K)
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