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Volume 12 (1968)
- Issue 4 Pages 181-
- Issue 3 Pages 123-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 12, Issue 3
Displaying 1-7 of 7 articles from this issue
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Jûrô KOYAMA1968 Volume 12 Issue 3 Pages 123-128
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSTrapping of armyworm moths with molasses-traps was tested from 1964 to 1967 in Akita. Three emergence peaks were distinguished in the seasonal fluctuations of captured moth numbers in a year, and the total numbers of each emergence peak varied widely. When the total catch of an emergence peak increased from previous peak, the precipitation in larval stage tended to be relatively small. The seasonal fluctuation in numbers of males and females resembled each other. The degree of ovarial maturation of females captured consisted of various stages from immature to mature except in the 3rd emergence peaks of 1965 and 1966. In the 3rd emergence peaks of 1965 and 1966, which were relatively larger than other peaks, the ovaries of moths were almost immature. The seasonal fluctuation was different between the traps in paddy field and the ones in field. Two cases of catch were noticed; in one case moths were caught at all traps coincidentally in the rainy and heavy windy weather in the 3rd emergence peaks of 1965 and 1966, and in the other they were caught only at the traps near the grass field out of any particular relation to the weather in the 1st emergence peak of 1966.View full abstractDownload PDF (654K) -
Kimito FURUTA1968 Volume 12 Issue 3 Pages 129-136
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSEggs and larve of D. spectabilis were artificially placed on pine trees and their survival was observed at two experimental stations, Momoyama and Sumiyoshiyama, in Kyoto. At Momoyama natural infestation by this insect was seen. At Sumiyoshiyama no natural population occurred. At Momoyama about 0.9% of the eggs released emerged as adults. During the late larval instars the mortality was caused by some density-dependent factors. Predation by Polistes japonica and dispersal were noticed as these factors. At Sumiyoshiyama the population, placed artificially by the experimentor, died out on the larval stage. In spite of the final extermination of the population, some density dependence was suggested by the different rates of mortality between high- and low-density populations. Only the predation by ants and mantises on hatching larvae was observed as mortality factors. These were observed only when the density was high.View full abstractDownload PDF (1032K) -
Jûtarô HIRAO1968 Volume 12 Issue 3 Pages 137-147
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe rice stripe virus could be acquired and transmitted to rice by both nymphs and adults of the delphacid species, Delphacodes (?) albifascia MATSUMURA. The virus was retained by the vector during its whole life span without fresh access to virus, however, transmission during this period was often intermittent and erratic. The acquisition threshold period was less than 30 minutes, and there was a latent period in the vector of 12 days in average. The highest percentage of transmission insects was 30%, while the percentage of viruliferous insects obtained by the hemagglutination tests was 80% in ordinal case. The virus was congentially transmitted through the eggs of the vector at a high rate. In the present species only brachypterous form was found in a field population. But laboratory rearing with a high density could produce macropterous form in both sexes, especially at a high rate in females. Nymphs could be reared on 19 graminaceous plants including important cereal crops such as rice, barley, and wheat. Among winter cereals wheat and rye were preferred significantly by adults. The incubation period lasted 14 days and nymphal period 19 days at 25°C. Most of adults were able to survive about five weeks and laid 100-200 eggs. Winter was passed by nymphs at the fourth instar in a state of diapause. The peak of adult emergence from the overwintered nymphs was on the first decade of April.View full abstractDownload PDF (2443K) -
Kimihiko SATO, Tetsuo SAITO1968 Volume 12 Issue 3 Pages 148-155
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSNS 2662, O, O-dimethyl dichlorohydroxyethyl phosphonate, and trichlorfon were effective to chewing insects but not to sucking insects. Topical toxicities, distribution, metabolism and in vitro cholinesterases inhibition of these insecticides were examined with larvae of rice stem borer, Chilo suppressalis WALKER and of tobacco cutworm, Spodoptera littoralis BOISD., and adults of American cockroach, Periplaneta americana L., house fly, Musca domestica vicina MACQ., green rice leafhopper, Nephotettix cincticeps UHLER, black rice bug, Scotinophara lurida BUR. and corbett rice bug, Leptocorixa corbetti CHINA. Permeability of cuticle, distribution in the various tissues and penetration into the dissected thoracic ganglions of 32P-NS 2662 and 32P-trichlorfon were not different between susceptible and non-susceptible insects. A good correlation was found to exist between degradation of these insecticides and susceptibility of insects to the insecticides. Cholinesterase sensitivity of these insects was examined for NS 2662, trichlorfon and their vinyl phosphate derivatives, and it was found that cholinesterase sensitivity was not parallel to topical toxicities. Selective toxicity of NS 2662 and trichlorfon may be explained in part by the difference in degradation rate of the insecticides among these insects.View full abstractDownload PDF (888K) -
Toshiatu KOYAMA, Masaichi TSURUMACHI1968 Volume 12 Issue 3 Pages 156-163
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIt has been considered that the effect of submerged application with chemical granulars against plant- and leafhoppers is due to the l thal action caused by the sucked juice in which translocated insecticides are involved. Therefore, various granular insecticides were tested on their systemic actions. In the application level of 3kg per 10a, PHC granular (against the small brown planthopper), PHC, MIPC and NAC granulars (against the green leafhopper) showed a systemic lethal function in the adult insects. This effect was only shown in low mortality and was noticed from the third day after application. Although diazinon and disulfoton have shown a good controling effect in practice, both insecticides showed no systemic lethal function in the application level of 43kg per 10a. On the other hand, the results of experiment concerned with the fumigative lethal function in the leaf- and planthoppers showed high fumigative lethal effects in any granular tried in this test, especially diazinon and disulfoton. Supposing from the results of these experiments, the main effect of submerged chemical application in the paddy field is not only due to their killing effect on adult leafhopper which sucked the insecticidecontaining juice of rice plant, but also due to the lethal action caused by the gas evaporated from water surface in the paddy field.View full abstractDownload PDF (2632K) -
I. Attracting Effectiveness of Various Lamps of Different Wave Lengths against the Green Rice Leafhopper, Nephotectix cincticeps UHLER (Hemiptera: Jassidae)Kaoru SASAMOTO, Masami KOBAYASHI, Hirobumi SHIRAISHI1968 Volume 12 Issue 3 Pages 164-170
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe attracting effectiveness of the thirteen lamps of different waves which have between 300 and 700nm for the green rice leafhopper was investigated. In the comparisons between each of different lamps alone, BL-lamp (360nm) demonstrated the highest effectiveness throughout the wave length region from invisible to visible. While, the prevailing B-lamp (420nm) indicated the effectiveness value of about 42 percent only as compared with BL-lamp, although its effectiveness is the highest in visible wave region. Also, at 630nm (S-lamp) in visible region a peak of effectiveness was obtained. Furthermore, the combination effect of different lamps with various mixing ratio was investigated and a combination of B-and BL-lamps (mixing ratio 3:7) was found to be the highest in attracting the green rice leafhopper.View full abstractDownload PDF (2043K) -
Kenzo FUJITA, Akio TOKI, Sadao HIRATA, Isuke MASUO, Kazuo SHITAOTSUBO1968 Volume 12 Issue 3 Pages 171-173
Published: October 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (329K)
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