All issues
Volume 24 (1980)
- Issue 4 Pages 205-
- Issue 3 Pages 137-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 24, Issue 2
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
Two Eriophyid Mites Injurious to Fig and Chrysanthemum in JapanHisashi NEMOTO, Masahiko KOBAYASHI, Takashi OSAWA, Shuichi YAMASHITA, ...1980 Volume 24 Issue 2 Pages 49-53
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSTwo eriophyid mites, Eriophyes ficus COTTE and Paraphytoptus sp., were found on fig, Ficus carica L., and chrysanthemum, Chrysanthemum morifolium RAMAT., respectively, which showed symptoms of mottling of leaves, in Honshu, Japan. The two mites had not been previously recorded in Japan. Moreover, this is the first report of the genus Paraphytoptus NALEPA from this country. The morphological features of the females of these species were described on the basis of the examination by scanning electron microscopy. The ridges of the female genital coverflap of E. ficus numbered 8 to 10. E. ficus was found to inhabit the hairs on the undersurface of the fig leaves, and to induce mottling of the leaves. The females of Paraphytoptus sp. were recognized by the following characters: Featherclaws 6-rayed. Shield with median line complete, ending at its rear margin; admedian lines complete, gradually diverging; the first submedian line running backwards, bifurcate anterior to dorsal tubercles. Genital coverflap with 16-19 longitudinal ribs. The females of this species closely resemble those of Eriophyes langei KEIFER, but the former seems to differ from the latter in the structures of the genital coverflap and featherclaws. Paraphytoptus sp. was found to inhabit the calyces and the hairs on the undersurface of the chrysanthemum leaves and stems. This mite induced mottling or chlorotic ringspot of the leaves.View full abstractDownload PDF (3732K) -
Hirotada TAMURA, Nobuo ENDA1980 Volume 24 Issue 2 Pages 54-61
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThree species of mesostigmatid mites, Dendrolaelaps fukikoae, D. unispinatus and Proctolaelaps hystrix, coexisted in the pupal chambers of Japanese pine sawyer beetle, Monochamus alternatus, which had been formed in the pine trees infected with the pine wood nematode, Bursaphelenchus lignicolus. Frequency of detection and population of D. fukikoae was highest among them. Deutonymphs of all species were carried by the emerging sawyer beetles with the nematodes. They showed no preference for either sex of the beetle, but each species preferred to ride on specific parts of the beetle's body. The former two species were nematode-feeders, but there was no high correlation between numbers of phoretic mites and the nematodes. Majority of the mites were detached from the beetle's body two weeks after its maturation feeding. The three species were distributed over almost all of the areas where pine wilt disease had occurred in Japan.View full abstractDownload PDF (768K) -
I. Preliminary Descriptions of Morphological and Life Type VariationYutaka SAITÔ, Kenichi TAKAHASHI1980 Volume 24 Issue 2 Pages 62-70
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSNine different local populations of Schizotetranychus celarius (BANKS) which inhabited dwarf bamboo were examined from the morphological and behavioral points of view. Morphological variations of dorsal propodosomal seta, P2 and dorsocentral hysterosomal seta, D2 among the nine populations were conspicuous. Comparison of the field and laboratory populations revealed that the variations in the setae, P2 and D2, had been fixed for each local population from generation to generation. Among these populations, there were three distinguishable groups with different length of setae, P2 and D2, (short, medium and long setae). Nest webs which were constructed by adult females under experimental conditions varied in size among the nine populations. The trend of the variation paralleled that of the setae, P2 and D2. Multiple regression analysis was made to estimate which morphological characters (xi) could affect the nest web size (Y). From this analysis, it was concluded that the features of the setae, P2 and D2 exerted an important influence on the nest web size. Behavioral observation of S. celarius females under the nest web showed that the setae, P2 and D2 appeared to operate as a sensor for the recognition of the woven roof of the nest. The statistical data, therefore, were explained by this function of setae.View full abstractDownload PDF (1054K) -
Tomoko SUGA1980 Volume 24 Issue 2 Pages 71-80
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe efficiency of fecal analysis the study of food habits was compared with that of stomach contents for two red-backed voles, Clethrionomys rufocanus bedfordiae THOMAS and C. rutilus mikado THOMAS in Hokkaido. Among plant foods, Gramineae, Cyperaceae and Equisetum arvense were identified by presence of epidermal cells and stomata, while no other plants could be identified. Animal foods were not divided into any group or species. Plants of Gramineae and Cyperaceae appeared more often in the feces than in the stomach. Relative appearance of insect remains in the stomach and feces greatly varied with the seasons. In view of food preference, however, fecal analysis was more representative of the difference in food habits of the vole species. Seasonal variation in the food habits of C. rufocanus bedfordiae coincided with that of planst, i.e., the most abundant plants in a season were mainly consumed. In contrast, C. rutilus mikado rather preferred specific kinds of foods throughout the seasons, suggesting that the former species accepts a wider range of food than the latter species.View full abstractDownload PDF (2403K) -
Kazuaki SHIMADA1980 Volume 24 Issue 2 Pages 81-85
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThirty-five pheromone traps were arranged in a checkerboard pattern in the test plot (7.5a in surface) of the tea field. In the control plot subjected to the conventional insecticide-spray programme (10a in surface) which was located approximately 150m apart from the test plot, 2 traps were placed at an interval of 15m. The injury by the larvae of the tortrix was estimated by counting the number of folded leaves/m2 of cropped top surface of the tea plants at the mature larval stage of each generation. Efficacy of the mass trapping was apparent in the 1st and 2nd generations when the population density of the insect was still low, the injury of the test plot being 50 and 60% of that of the control plot, respectively.View full abstractDownload PDF (499K) -
Yûji OKADA, Fusao NAKASUJI1980 Volume 24 Issue 2 Pages 86-92
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe potato aphid Acyrthosiphon solani (KALTENBACH) was reared individually on a leaf of soybean in a plastic cup at 23°C and with a 16hr day length. The lx and mx curves of adults were not significantly different between the apterae and alatae. The intrinsic rate of increase (rm) of apterae was estimated as 0.21. The population growth and the dispersal of the aphid were observed on soybean plants. Six apterous nymphs at the 4th instar were inoculated on different parts of each plant, i.e. the lowest, 2nd or 4th leaf. Regardless of the leaf the aphids were inoculated on, they began to reproduce. When the number of aphids increased to a level of the density on the leaf, the aphids migrated to the above leaf. The migration of the aphids from the leaf or the plant occurred when the number of aphids was maximum and aphids of all developmental stages migrated simultaneously. Immediately after, the leaf died of serious infestation. A small number of adult alatae emerged throughout the period of the experiment, but among them, less than 50% migrated from the plants. The instantaneous rates (r0) of increase on the soybean plants were similar to the value of rm, suggesting that the population growth was not affected seriously by the overcrowding of the aphids.View full abstractDownload PDF (692K) -
Akira TSUCHIYAMA1980 Volume 24 Issue 2 Pages 93-97
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe pathogenicity of Bacillus sphaericus strain SC1713 isolated from dead larvae of the mosquito, Culex pipiens, was studied. Larvae were killed in the suspension of the vegetative cells or spores. LC50 value (bacterial cells/ml) decreased as the duration of the feeding period increased. LC50 (cells/ml) of vegetative cells for 1st-, 2nd- to 3rd-, and 4th-instar larvae was 2.3×104-2.0×105, 4.8×105-5.2×106, and 1.5×106-1.0×107, respectively. First- and 2nd- to 3rd-instar larvae were more susceptible to spores than vegetative cells, but 4th-instar larvae seemed to be more susceptible to vergetative cells than spores. Time course mortality of larvae released in the suspension of vegetative cells at the concentration of 1.2×107cells/ml and 1.2×106cells/ml showed the same pattern irrespective of the presence of food. When larvae were released in the spore suspension in the absence of food, the mortality reached values of more than 90% at the spore concentration of 1.8×106-1.8×103/ml.View full abstractDownload PDF (644K) -
Yoshiaki KONO1980 Volume 24 Issue 2 Pages 98-104
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe body weight of the Henosepilachna adult increased markedly when reared on food plant foliage under short-day. It reached 140% on the 3rd day of adult life (100% at the emergence) and exceeded 150% on the 6th day. Fat body also developed after the 6th day, and filled the body cavity until the 16th day, when the beetles ceased feeding and entered diapause. Dry weight and lipid content of the adult increased markedly between the 3rd and the 6th day, and thereafter the increase became gradual. In this insect, the change of photoperiodic condition from a short-day to a long-day after the 5th day of adult life did not stimulate the ovarian development. When the adults were fed on sliced potato, the development of the fat body was delayed and the sensitivity to the photoperiodic change was maintained for a longer period of time. Under such conditions, therefore, the diapause was broken by the above-mentioned photoperiodic change even after the 5th day of adult life. It is concluded from these results that the photoperiodic sensitivity depends on the development of the fat body.View full abstractDownload PDF (2522K) -
Tetsu ASAYAMA, Kazushi OHOISHI1980 Volume 24 Issue 2 Pages 105-107
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (1486K) -
Seiji UEMATSU, Sizuo ONOGI1980 Volume 24 Issue 2 Pages 108-110
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIt was found that the soil layer in which a large number of Platypleura kaempferi nymphs were observed was located at 10-30cm from the soil surface. About 70% of the nymphs were also found under the ground at a distance of 60-140cm from the trunk of the host tree. The mean density of nymphs per 1m2 of ground surface under a loquat fruit tree crown was calculated to be 32.2, although marked variations were noted.View full abstractDownload PDF (378K) -
Tei SATO1980 Volume 24 Issue 2 Pages 110-111
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (855K) -
Nobuo GOKAN1980 Volume 24 Issue 2 Pages 112-114
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (1026K) -
Osamu SETOKUCHI, Akira TANAKA1980 Volume 24 Issue 2 Pages 114-117
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (493K) -
Kenji KOYAMA, Jun MITSUHASHI1980 Volume 24 Issue 2 Pages 117-119
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (356K) -
Kisaku AKUTSU, Kenichiro HONDA, Shigeru ARAI1980 Volume 24 Issue 2 Pages 119-121
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (1228K) -
Jutaro HIRAO, Kiyomitsu ITO1980 Volume 24 Issue 2 Pages 121-124
Published: May 25, 1980
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (560K)
- |<
- <
- 1
- >
- >|