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Volume 23 (1979)
- Issue 4 Pages 207-
- Issue 3 Pages 129-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 23, Issue 2
Displaying 1-13 of 13 articles from this issue
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Mitsuhiro SASAKAWA, Yukio SHIOZAWA1979 Volume 23 Issue 2 Pages 55-60
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe fundatrigenia of Moritziella castaneivora dispersed twice in summer during the growing period of chestnut burs in Kyoto Prefecture. Firstly, some nymphs of the second generation moved toward the base of chestnut cones from the branches, where the fundatrix and first generation of fundatrigenia grew up, in late June. The first peak of occurrence was discernible at the end of August as a result of the successive generations, and serious damage (green chestnut bur-burst) was caused by them. Thereafter, the first instar crawlers of the fourth or fifth generation on the chestnut cones dispersed round the trees, and the second peak appeared in early September. This second dispersal was observed by using sticky traps, and the daily dispersal activity was high in the afternoon. The first instar nymphs were seen to crawl about 4cm per minute on paper and to survive only for about 5 hours without the host-plant. The dispersal among the trees, therefore, was restricted within a narrow area of the field.View full abstractDownload PDF (691K) -
Sohei YASUDA1979 Volume 23 Issue 2 Pages 61-68
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe morphological features, especially those of instrumenta cibaria, genital opening, perivulvar pore, marginal dorsal duct, grand spine, of Pseudaulacaspis pentagona were examined with a scanning electron microscope. As a result, it could be demonstrated that each circumgenital pore consited of a great number of small pores showing each about ten mushroomlike projections. In addition, insertion of stylets in mulberry tissues was examined at each growing stage from hatching larva to female imago, and it was observed that the stylets penetrated into the phloem-parenchyma two hours after insertion, and thereafter they curved into the phloem and broke into annulation along the cambium. Moreover, the mode of insertion of the stylet as well as the morphology of the portion of mulberry tissues from which the scale sucks were examined with a light microscope. The influence of stylet penetration into the plant cell was also investigated. It was found that when the stylet penetrated into the plant cells, these were killed.View full abstractDownload PDF (5613K) -
Ken-ichi KANDA, Atsushi NAITO1979 Volume 23 Issue 2 Pages 69-77
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe nocturnal behavior of Leucania separata moth was observed for 4 nights after emergence under artificial light cycle of 16L:8D and after mating under natural photoperiod. The behavior of moths changed considerably as a function of age. The peak emergence occurred before and after the light was turned of and the moths could not fly for about 3hr after emergence. One and two-night-old moths were inactive except for the flight with feeding immediately after the onset of scotophase. Three-night-old moths flew actively and female moths began to call in the latter half of darkness, but some of them ceased their flight before the onset of photophase and did not show any activity when the light was turned on. Four-night-old females started to call at an earlier time than the three-night-old ones and they laid their first eggs. Mating began on the 3rd night and maximum mating activity was observed 5hr after darkness. Number of deposited eggs decreased as moths became older, and 91% of the total eggs were oviposited by the 4th night after the first mating. Mated females oviposited in the first half of darkness especially 1hr after darkness, they called and mated again in the latter half of the night. Such behavior was discussed in relation to the mass migration and concentric oviposition.View full abstractDownload PDF (1116K) -
Shozo TAKAHASHI, Mitsuo KAWARADANI, Yasuo SATO, Michihiko SAKAI1979 Volume 23 Issue 2 Pages 78-81
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSFrom an extract of female abdominal tips of Leucania separata (Z)-11-hexadecenol and its acetate have been isolated as the two major components of the sex pheromone. Ratio of the acetate to the alcohol in the extract was found to be 8:1. Laboratory bioassay of the synthetic compounds in ratios of between 9:1 and 1:1 showed high pheromonal activity. Two major components of the sex pheromone of Leucania loreyi have been isolated from an extract of female abdominal tips. These were identified as (Z)-9-tetradecenyl acetate and (Z)-11-hexadecenyl acetate.View full abstractDownload PDF (476K) -
III. Responses of Mites to Webbing Residues and Their Preferences for Particular Physical Conditions of Leaf Surfaces (Acarina: Tetranychidae)Yutaka SAITÔ1979 Volume 23 Issue 2 Pages 82-91
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSComparative studies of behavior of four species of spider mites, Oligonychus ununguis, Panonychus citri, Schizotetranychus celarius and Tetranychus urticae, with respect to the mites' responses to the webbing residues and their preferences for particular physical conditions of leaf were conducted under laboratory conditions. Active walking was observed in the females of T. urticae and S. celarius during the first hour after release on the leaves. Thereafter the mites of these two species became less active and spent most of their time feeding and/or resting. The activity was low in the females of O. ununguis during the first hour, but otherwise their behavioral pattern was similar to that of the above two species. The females of P. citri, however, were always found to be least active during the whole first hour of observation. The females of O. ununguis and S. celarius strongly preferred depressions along the vein, while those of T. urticae and P. citri failed to show such preference. The mites of the four species responded differently to their threads or webs. The females of O. ununguis mostly lived under the webs, those of S. celarius only under the webs, while those of T. urticae walked upon, in or under the webs, but fed mainly under the webs. The females of P. citri spun while walking, but appeared to live in avoiding their own threads and they did not construct webs. From the results of the previous and present studies, it is conceivable that the spider mite threads serve as the “lifelines” throughout their life on trees, and also as the “material for building structures” useful for their life on microhabitats.View full abstractDownload PDF (1236K) -
Keigo MATSUMOTO, Hideakira TSUJI1979 Volume 23 Issue 2 Pages 92-99
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe winter population of Myzus persicae in a Chinese mustard field in Shiga contained a large proportion of red (R) aphids, whereas the proportion of yellow green (YG) aphids began to increase in spring. When R aphids were reared at 25°C, some YG progenies appeared at F2 generation and all aphids were found to be YG ones after 2 months. Very few YG progenies were produced in R colonies and no R progenies were produced in YG colonies when both the colonies were continuously reared at 15°C. A short period (4 to 8 days) of chilling treatment of YG aphids at 5°C was effective in producing R aphids in their F1 progenies reared at 25°C. The stage most sensitive to the chilling treatment was the fourth (final) instar. Adults and third instar nymphs were also sensitive, but younger nymphs died during the chilling treatment. The number of aphids per colony was greater in colonies from R parents than in those from YG ones in the winter field, but this tendency was reversed late in march. The growth of experimental populations was faster in clones from YG parents than in those from R ones under the high temperature of 25°C.When exposed to the low temperature of 5°C, most of YG adults died during the first 8 days, whereas most of R ones survived for more than 16 days. These facts suggest that the occurrence of two colour types in M. persicae is a kind of dimorphism adaptive to seasonal changes of the environment. When tested at 25°C, R aphids were 2 to 8 times as susceptible to 5 insecticides tested as YG aphids, though two insecticides, 2-(N, N-dimethylcarbamoyl)-4-isoxazolin-3-one and O, O-diethyl-S-(4-chloro-5-methyl-3-oxo-4-isoxazolin-2-ylmethyl) dithiophosphate, were quite effective against YG aphids.View full abstractDownload PDF (880K) -
Takuma GAMO, Hisatomo FUJIMORI, Toshio YAMAMOTO, Tomoko UEDA1979 Volume 23 Issue 2 Pages 100-104
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSA mutant gene for retarded growth in Bombyx mori larvae has been discovered in a strain of w2 oew homozygotes. The skin of the retarded larvae at the 2nd and 3rd molting stages is reddish brown with a glossy appearance, and the body size is short like that of the narrow breast (nb) mutant. It was clear from the genetic study that the retarded glossy larvae are produced by heterozygosity of a dominant gene and that homozygotes die at the embryonic stage of blastokinesis. Linkage analysis showed that gene was linked with the nb gene located at 0.0 map unit on chromosome 19, and the recombination value between both genes was estimated at 23.3%. Furthermore, this mutant gene was confirmed to be allelic with the Gl gene located on the same chromosome and was designated as glossy retarded, GlR.View full abstractDownload PDF (2182K) -
Kikuo IWABUCHI, Kenji ISHII, Chiemi HOSOKAWA1979 Volume 23 Issue 2 Pages 105-109
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSLarvae of Oraesia emarginata were reared continuously for more than ten generations on artificial diets containing dried powder of Cocculus trilobus and chlorella. Under laboratory conditions, effects of rearing were not significantly different from those of rearing on fresh leaves. Rearing on diets without chlorella resulted in a somehow slower development and mortality was slightly higher. Addition of L-ascorbic acid to diets was necessary for rearing these insects.View full abstractDownload PDF (676K) -
Hideo KAJI1979 Volume 23 Issue 2 Pages 110-112
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (375K) -
Shoji ASANO, Masaharu KAMEI1979 Volume 23 Issue 2 Pages 113-114
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (264K) -
Rikio SATO, Kaoru YAGINUMA, Masaaki KUMAKURA1979 Volume 23 Issue 2 Pages 115-117
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (386K) -
Yasushi WASHIZUKA1979 Volume 23 Issue 2 Pages 117-118
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (252K) -
Fusao NAKASUJI, Hachiro HONDA1979 Volume 23 Issue 2 Pages 118-120
Published: May 25, 1979
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSYellow artificial flowers filled with 10% honey solution were put in a box (65×42×50cm) with a fluorescent lamp (20w) located on the ceiling. Adult females of Parnara guttata guttata copulated there and laid eggs on rice seedlings. Larvae were reared on rice seedlings. The rearing stock was maintained for over 20 generations by this method.View full abstractDownload PDF (1059K)
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