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Volume 13 (1969)
- Issue 4 Pages 167-
- Issue 3 Pages 117-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 13, Issue 1
Displaying 1-8 of 8 articles from this issue
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Tosihiko HUKUHARA, Hisao ARUGA, Masahiko KOBAYASHI1969 Volume 13 Issue 1 Pages 1-4
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe signs and symptoms of the granulosis of Hyphantria cunea were described. The virus particle isolated from the granules was 300-350×50-65mμ in size. The granules and the virus particles were found in the cell cytoplasm of adipose tissue. The virulence of the granurosis virus and that of the nuclear-polyhedrosis virus were nearly the same, when they were administered perorally to H. cunea larvae. The granulosis virus of H. cunea was not transmissible to larvae of Bombyx mori.View full abstractDownload PDF (1408K) -
I. The Distribution of Wood Mice in Mountainous DistrictsShôei ÔTSU1969 Volume 13 Issue 1 Pages 5-8
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSWood mice were collected with snap traps in 30 different yong reforested forests of coniferous trees in Yamagata Prefecture during the period from May to November, 1967. The total number collected was 320, including 37 Microtus montebelli (MILNE-EDWARDS), 24 Aschizomys andersoni (THOMAS), 243 Apodemus speciosus (TEMMINCK et SCHLEGEL) and 16 Apodemus argenteus (TEMMINCK et SCHLEGEL). Generally speaking, in a forest in which A. speciosus was frequently found, M. montebelli was rare, and vice versa. The number of M. montebelli collected in the Dewa hills of western Yamagata Prefecture, was larger than that of the Ôu mountains in the east of the Prefecture. There was no relation between the altitude and the number of M. montebelli, or that of A. speciosus. On the contrary, A. andersoni was more frequently found in high level forests than in lower ones. A. argenteus was rare in the reforested area. However, some specimens of this species were found in a natural forest which is located at a higher level than the reforested area, the highest altitude of which was about 1, 000 meters.View full abstractDownload PDF (448K) -
Motoyoshi MOGI1969 Volume 13 Issue 1 Pages 9-16
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSUsing Aphis craccivora KOCH (Aphididae) as prey, H. axyridis larvae were reared individually from hatching at various prey densities (w) in a dish. The number of preys eaten by a predator per day (x), the duration of instar (duration to next instar or to death) (y), and the survival rate (Z) in each instar were recorded. The percentage predation by each instar, Pnw%={(x×y)/(w×ln)}×100 (ln: mean maximum duration of n-th instar) was supposed to increase initially, then later decreased with increasing prey density. The percentage predation by each instar following the immediately preceding instar, Qnw%={(x×y×Zn-1)/(w×ln)}×100 (Zn-1: survival rate to n-th instar from (n-1) th instar) increased initially, then decreased with increasing prey density. The percentage predation by whole larval instars, Rw%={1004Σn=1(x×y×Zn)}/(w×L) (Zn: survival rate at n-th instar from hatching, L: mean maximum larval duration) increased initially, then decreased with increasing prey density. Therefore the developing larvae of H. axyridis can act as a density-dependent mortality in a range of prey density. But when percentage predations were relatively high, the predators starved.View full abstractDownload PDF (1024K) -
Hiromu AKAI1969 Volume 13 Issue 1 Pages 17-21
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThree types of haemocytes of a wild silkworm, Philosamia cynthia ricini, which appeared on the fat-body cells during metamorphosis, were studied by an electron microscope. The first type of haemocytes included three kinds of lipid-like droplets coinciding with the fat droplets in the fat-body cells and vacuolar bodies with digested materials. They may be classified as granular cells as compared with the haemocyte classification of Bombyx by NITTONO (1960). The second one included bodies with lysosome-like characteristics, with undeveloped intracellular organelles in the cytoplasm. They may also be classified as the other type of granular cells. The third was a spindle-shaped one with several pseudopods. In the cytoplasm, developed intracellular organelles such as granular endoplasmic reticulum and Golgi apparatus were observed. This type also included some lipid-like bodies in the cytoplasm and was classified as plasmatocyte. These haemocytes seem to make contact with the fat-body cells, to perform phagocytic action on the cytoplasmic materials of the latter and to repair both cell membranes and connective tissue sheath after the partial break down of the fat-body cells during metamorphosis.View full abstractDownload PDF (4169K) -
Kazuo NOZATO1969 Volume 13 Issue 1 Pages 22-25
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe oviposition site of the egg of Rhyacionia duplana simulata HEINRICH on each shoot of the pine tree was investigated in Fukuoka City during 1965-1967. The eggs of this species were laid on the bark of the old growth, the inner side of needles, the outer side of needles, and on needle sheaths, cones, bud scales and new needle sheaths. A greater majority of the eggs were deposited on the older growth than on the new one within a shoot. The eggs of this species were densely distributed near the point at which the old growth contacts new ones at about the middle part of the shoot. Furthermore, a greater number of eggs were laid on large shoots than on small ones.View full abstractDownload PDF (480K) -
Tetsu ASAYAMA1969 Volume 13 Issue 1 Pages 26-30
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIncidence of some diseases of the oriental tussock moth larvae at limited areas in Aichi Prefecture was surveyed. The diseased larvae were classified into four types, i.e. nuclear polyhedrosis, cytoplasmic polyhedrosis, microsporidian disease or a disease caused by virus and microsporidia simultaneously. The cytoplasmic polyhedrosis and the microsporidian disease were found in the larvae of Euproctis subflava BREMER originally. External symptoms of the larvae infected with nuclear or cytoplasmic polyhedrosis virus were similar to some other lepidopterous insects infected with these viruses respectively. Long rod-shaped particles of the nuclear polyhedrosis virus were consistently observed in ultrathin section of the infected tissues. Size of virus particles was approximately 40×400mμ. A few (1 to 4) virus rods were enclosed in a membrane, and observed in and out of the polyhedral crystal. The cytoplasmic polyhedron was hexagonal in shape, which measured 0.5 to 3.0μ. Symptoms of the larvae infected with microsporidian disease were faint movements and retardation of growth or dwarf. The microsporidia was tentatively assigned to the genus Nosema. The spore was elliptical in shape and ranged from 0.7∼0.9×1.3∼1.6μ. It appeared that the nuclear polyhedrosis mainly broke out in the last instar larva, but microsporidian disease occurred in all larval stages except young instar.View full abstractDownload PDF (1633K) -
Hideo TAKEZAWA, Masato UCHIDA1969 Volume 13 Issue 1 Pages 31-39
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe leaves on which the arrowhead scale, Unaspis yanonensis Kuwana, feeds were collected throughout a period from February 1964 to January 1965 at an interval of 4 or 5 days, and all of the female adults were examined on the following points; (1) the degree of maturation of the ovaries, (2) whether the oviposition has been finished or not, (3) number of the eggs in ovaries of the matured females, and (4) number of the first instar nymphs found under the scale. Seasonal fluctuation of the first nymphs under natural condition were also investigated in order to check the results obtained from those experiments. The close relationship was found between the pattern of the appearance of the first instar nymphs under natural conditions and the percentage curve of the female adults having matured ovaries, as well as the percentage curve of the females which were ovipositing and oviposited. It was clearly recognized that the ovaries of females showed the regular changes before the appearance of the first instar nymphs. The number of the eggs contained in ovaries fluctuated in parallel with that of the first instar nymphs which were found later under the scales. The seasonal fluctuation in number of the nymphs observed under the scales was parallel with that of the population of the first instar nymphs under natural condition. It was ascertained that fluctuation curve of the first instar nymphs in the first and second generation can be estimated from the number of nymphs under the scales. The time of the first instar nymph appearance may be estimated about 2 months ahead in the first generation and 1 month earlier in the second generation by observing the time of blastoderm formation and yolk formation respectively.View full abstractDownload PDF (1209K) -
Akira HASHIMOTO, Hiromi YOSHIDA, Katsunori MUKAI1969 Volume 13 Issue 1 Pages 40-41
Published: March 25, 1969
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (197K)
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