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Volume 10 (1966)
- Issue 4 Pages 167-
- Issue 3 Pages 105-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 10, Issue 1
Displaying 1-9 of 9 articles from this issue
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Tsutomu HASHIGUCHI, Narumi YOSHITAKE1966 Volume 10 Issue 1 Pages 1-6
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIn order to explain the controlling mechanism of the black pupae by the hormone determining the black pupal color, the authors investigated the changes in the phenoloxidase activity of the blood and the integument at the time of the manifestation of the black pupae. From the results of these experiments it became clear that there is a close relationship between the phenoloxidase activity of the integument at the end of spinning stage and the formation of black pigment in the cuticle. At least six factors may be considered as predisposing factors for the manifestation of the black pupal color; they are prothoracic hormone, black pupa hormone, black pupa gene (bp), phenoloxidase activity in the blood and the integument, the proenzyme activating substance (activator) and the low temperature incubation at the spinning stage. The details of the interrelationship among these factors are not known but it is plausibly thought that the black pupa gene is either directly or indirectly concerned with the increase of the phenoloxidase activity in the integument after the end of spinning in the presence of the black pupa hormone.View full abstractDownload PDF (807K) -
Ryoh-ichi OHGUSHI, Toshikatsu NISHINO1966 Volume 10 Issue 1 Pages 7-16
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe mortality of arrowhead scale attacking the citrus trees was studied for two winters during 1963-1965 at Nagasaki Prefecture. 689 individuals of immature adult females, 2251 of matured adult females and 2141 of male pupae were marked and observed since December 1963 to May 1964. The mortality during the winter were as follows; immature adult females 97 percent, matured adult females 84 percent and male pupae 97 percent. 506 individuals of immature adult females, 1930 of matured adult females and 960 of male pupae were marked and observed during January-May 1965. The mortality during the winter season were as follows; immature adult females 91.5 percent, matured adult females 95.3 percent and male pupae 97.8 percent. These data on mortality were compared with some other mortality records of this species investigated at various districts of Japan. Winter mortality of other districts varied between 50∼82 percent in immature adult females 10-90 percent in matured adult females. The winter mortality observed in Nagasaki Prefecture were higher than those of other districts. Age distribution of overwintering arrowhead scale in this orchard was examined during the same seasons. In early winter, various stages of living scales such as 2nd instar larvae, immature adult and matured adult of females, 1st instar larvae, 2nd instar larvae and pupae of males were found. During these winters, proportion of young larvae gradually decreased and at the beginning of spring, overwintering arrowhead scale populations chiefly consisted of matured adult females and pupae of males. These results coincided with the results obtained from some other districts.View full abstractDownload PDF (1046K) -
V. Fluctuation in Population Size of the Second Generation of Mamestra brassicae (L.) in a Cabbage FieldSadao HIRATA1966 Volume 10 Issue 1 Pages 17-23
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSTo clarify certain phases of fluctuation in the size of population of Mamestra brassicae, daily counts of eggs and larvae of the second generation were made in a cabbage field at Hirosaki from the middle of August till early October in 1959. Seven egg-batches were found in six plants among eighteen sampled plants and five of them hatched but two were lost immediately after hatching. The larvae from each egg-batch formed their own population on the plant on which they hatched. The first instar larvae congregated tightly on the leaf where they hatched. After the second instar the larvae migrated gradually to other leaves of the same plant, and all the final instar larvae entered into the head of the plant. The fourth and fifth instar larvae showed a strong tendency to migrate prior to the moulting stage. All the larvae always occupied the ventral side of the leaves of the host plant. The survival rate of each larval population from respective egg-batch gradually reduced with the lapse of time and 20 percent or less of the initial member was able to reach the final instar.View full abstractDownload PDF (766K) -
Kaku OHSHIMA1966 Volume 10 Issue 1 Pages 24-38
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSExperimentation on the oral infection of pébrine was performed by the larvae from the 1st day of the 3rd instar to the 3rd day of the 5th instar. It was revealed that the larvae, the 4th instar just after molting, can produce cocoons and eclose, if they are slightly infected with spores less than about 2, 000 in number per larva, and that the larvae, the 3rd day of the 5th instar, even if they are infected with abundant spores, can make cocoons and eclose. Both of them apparently showed no symptom of disease. The number of spores contained in faeces discharged from diseased larvae, however, is generally very few, on an average 0.2 spores per field, when faeces are ground and observed. Therefore, the condition which brings about diseased silkworm moths may be explained as follows. Diseased silkworm mother moths with pébrine which lay hereditarily diseased eggs are derived from larvae slightly infected with spores per os during the larval stage from the 1st day of the 4th instar till ripening.View full abstractDownload PDF (1243K) -
Syunro UTIDA1966 Volume 10 Issue 1 Pages 39-43
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSWater content of adult body was measured on several kinds of bean weevil attacking stored beans, namely Bruchus rufimanus, Callosobruchus chinensis (two geographical strains), C. maculatus (three strains), C. analis, C. phaseoli, C. rhodesiensis?. and Zabrotes bifasciatus. The change in water content of the body with the lapse of adult life and its sexual difference were different with the species, but these were almost the same within the geographic strains of a species. Among these species or the strains in each species, reciprocal relation was found between the body weight and the water content. Bruchus rufimanus which feeds on the succulent seed of growing plant in the larval stage was most heavy in its body weight and lowest percentage of water content, while the relation turned vice versa in Zabrotes bifasciatus whose larva feeds mainly on dryed seed under stored condition. Five species of genus Callosobruchus took their intermediate situation between these two extremes.View full abstractDownload PDF (541K) -
Takayasu YAMADA, Kuniko TOTSUKA1966 Volume 10 Issue 1 Pages 44-46
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (358K) -
Yoshio TAMAKI1966 Volume 10 Issue 1 Pages 46-48
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (369K) -
Problems on the breeding of insects for biological assay of insecticides. ILII.Sumio NAGASAWA, Isamu NAKAYAMA1966 Volume 10 Issue 1 Pages 48-49
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
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Akifumi HAYASHI, Masayoshi HATSUKADE1966 Volume 10 Issue 1 Pages 49-51
Published: March 25, 1966
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESS
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