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Volume 11 (1967)
- Issue 4 Pages 145-
- Issue 3 Pages 83-
- Issue 2 Pages 37-
- Issue 1 Pages 1-
Volume 11, Issue 2
Displaying 1-8 of 8 articles from this issue
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III. On Factors Controlling Coat Color ChangeShoei OTSU1967 Volume 11 Issue 2 Pages 37-42
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe process of coat color change of the snow-shoe hare, Lepus brachyurus angustidens HOLLISTER which inhabits in the north-eastern part of the mainland of Japan was studied from September of 1963 to April of 1966. It was found that illumination length per day has much to do with the color change. The results of experiments were as the following. The color change from brown to white from autumn to winter was inhibited by the exposure of animals to artificial illumination of longer than 12 hours per day with fluorescent lamps which started from the middle of September. The color change from white to brown from winter to spring was almost stopped by exposure to the artificial illumination of 10 hours per day in a dark room which started at the middle of February. Longer exposure accelerated the change of browning in white winter animals. Colored lights and temperatures exerted no influence to the color changes. From these results, the day-length in nature is considered to be most important among the environmental factors controlling the coat color change of the snow-shoe hare.View full abstractDownload PDF (3886K) -
Teiichi OKUTANI1967 Volume 11 Issue 2 Pages 43-49
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIn this paper the food-plants of Japanese Symphyta so far known to the writer at present are listed. The plants observed by him or reliabley published are described in scientific names and new or corrected observations are shown with an asterisk on the plant names. The food-plants of family Tenthredinidae will be given in the next paper.View full abstractDownload PDF (739K) -
I. Insertion of the Stylets into Host PlantAtsushi NAITO, Jujiro MASAKI1967 Volume 11 Issue 2 Pages 50-56
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe probing punctures by N. cincticeps on the rice plant leaf were found abundantly in the area adjacent to stomata on the both of abaxial and adaxial sides of the midde leaf veins, although some of them were found also on the moter cells and small leaf veins. The mouth parts inserted into the host tissue in situ were obtained by killing insects with high voltage shock, and they were fixed and sectioned for histological study. When the stylet is inserted into the plant tissues, the salivary sheath is formed with saliva secreted from the tip of the stylet. The salivary sheath having the form of ramifying root was observed frequently. Sometimes the stylets curved, but only to the right and left directions. The stylets or stylet track usually reached the phloem or xylem, although they terminated in the mesophyll or parenchyma in the leaf tissue. In average, 70.3 per cent of the salivary sheaths left by N. cincticeps within the leaf sheaths of rice plant reached the vascular bundles, while only 29.7 per cent terminated in the mesophyll or parenchyma. From these results, it is considered that the feeding habit of the leafhopper belongs to the vascular bundle type.View full abstractDownload PDF (3158K) -
Naoshi WATANABE1967 Volume 11 Issue 2 Pages 57-61
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe brown planthopper, Nilaparvata lugens STÅL and the smaller brown planthopper Laodelphax striatellus FALLEN were reared on the rice seedling in grass tubes under the conditions of constant temperature of 27.5°C and day lenght of 16hr illnmination per day. In N. lugens, the percentage of the number of the brachypterous females was increased by reducing the density of hoppers per rice seedling whenever the density of hoppers per tube was high. While, in L. striatellus the appearance of the brachypterous female was induced under the rearing condition of the low hopper density per food plant or per tube. In N. lugens the appearance of brachypterous male was induced by the high hopper density when the quantity of food was sufficient for the hopper. In L. striatellus, brachypterous male appeared very few through the present experiment. In both species, the feeding on the feeble rice seedling scarcely caused the appearance of brachypterous male and female even under the isolated rearing. The visual stimulation effect among hoppers for the determination of the wing-forms of L. striatellus was not clear in this experiment. It was statistically examined that the first instar hoppers of both species had a habit of aggregation.View full abstractDownload PDF (668K) -
Akira NAGATOMI1967 Volume 11 Issue 2 Pages 62-65
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe larvae of Epicauta gorhami MARSEUL were reared at the constant temperature of 25°C and of 30°C and the results were as follows: at 25°C almost all of them became pseudopupae (i.e. a stage of diapause), while at 30°C most of them changed directly into pupae and the rest, which became pseudopupae, were transformed into the 6th instar (i.e. a stage just before pupa) 5∼7 days later. It is certain that the larvae of E. gorhami hibernate as pseudopupae at a temperature below 25°C under the natural condition.View full abstractDownload PDF (433K) -
Etsuji SUGAI1967 Volume 11 Issue 2 Pages 66-70
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSApholate administered orally to the fifth instar larvae at concentrations of 300 and 500μg per larva significantly reduced the number of eggs deposited in adults and hatchability of eggs. The effect of the chemical was more striking when applied at the beginning or the middle of the fifth instar than at the end of the same instar. In histological observation, it was noted that cell destruction occurred 48 hours after the treatment in the region in which nurse cells and oocytes were differentiating, however, cell destruction ceased about 120 hours after the treatment and cellular development recovered to normal. On the other hand, about 72 hours after the treatment, the chromatin of the nurse cells which had already finished differentiation at the time of treatment were clumped in masses and the nuclei were vacuolated. No visible changes were observed in oocytes. After this period the development of the nurse cells continued normally as well as those in the control. Normal growth was maintained up to the prepupal stage. At this stage a sudden degeneration occurred not only in the nurse cells but also in the oocytes themselves and were almost completely degenerated at pupation. It was suggested that as the oocyte development progressed, higher concentrations of the sterilant were needed to produce adverse effect. Cellular degeneration did not occur at the stage in which nurse cells were reduced in size and the oocytes were surrounded by the follicle cells vertically arranged in a line.View full abstractDownload PDF (1423K) -
Ryuzo KOBARA1967 Volume 11 Issue 2 Pages 71-75
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe sexual difference in haemolymph protein of four insects was studied by means of an improved disc-electrophoresis (discontinuous electrophoresis) on acrylamide gels. The heamolymph was obtained from the larvae and pupae of the silkworm, Bombyx mori L., the larvae of the rice stem borer, Chilo suppressalis WALKER, the adults of the American cockroach, Periplaneta americana L. and the house fly, Musca domestica L. Sexual difference in silkworm haemolymph protein was detected at the middle stage of the fifth larval instar and also in the pupal stage. Similar sexual difference was found in the haemolmph in the rice stem borer, the American cockroach and the house fly. In order to elucidate whether the testis and ovary have some influences on the silkworm haemolymph protein pattarns in either sex, they were either implanted or castrated in the early stage of the fifth larval instar. The reults indicated that the testis and ovary, in general, have no relation with the sex-specific component of larval haemolymph protein. It was found, howover, that the castration of ovaries from the females of the KL strain induced a change in the haemolymph protein paterns at the middle pupal stage.View full abstractDownload PDF (1124K) -
Tatsumi SUGIMOTO1967 Volume 11 Issue 2 Pages 76-78
Published: June 25, 1967
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESS
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