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Volume 30 (1986)
- Issue 4 Pages 219-
- Issue 3 Pages 167-
- Issue 2 Pages 81-
- Issue 1 Pages 1-
Volume 30, Issue 3
Displaying 1-9 of 9 articles from this issue
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Masahiro TAO, Kenji FURUSAWA, Kunio SUNAGAWA1986 Volume 30 Issue 3 Pages 167-172
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSEffect of high temperature conditions during pupal stage of melon fly, Dacus cucurbitae COQUILLETT, was investigated. Pupae were exposed to 27°C (control), 30°C, 32°C and 34°C before testing of emerged adults. Emergence rate was significantly lower in the pupae treated with 34°C than in those with 27°C, 30°C and 32°C. Flight ability of adults tested by a modified method of BOLLER et al. (1981) was significantly lower as the temperature condition during pupal stage became higher. There were no difference in ovarian development of females in all treatments. Percentages of mated pairs were higher in the flies treated with 27°C and 30°C, but low in those treated with 32°C. Flies treated with 34°C hardly copulated. Males were more susceptible to higher temperatures than females in the harmful effect on mating ability. In the condition that only flies having flight ability could be fed, survivorship was lower in the adults treated with higher temperatures especially with 34°C.View full abstractDownload PDF (660K) -
Yukio KUWANA1986 Volume 30 Issue 3 Pages 173-178
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIn the Osaka population, the critical photoperiod for the induction of diapause did not vary with temperatures ranging between 20°C and 30°C, and the sensitive period ranged from the latter half of the egg-stage to the 2nd-instar larval stage immediately before the diapause. Leucoma candida (STAUDINGER) had been recorded only in northern Japan until it was discovered in Kobe in 1957. Field survey conducts in the period 1971-1978 showed that this species was already distributed throughout the Kinki district and parts of the Chugoku and Chubu districts. The photoperiodic response did not show any clinal variation. In the Kinki and adjacent areas the critical photoperiods of the bivoltine Osaka, Kurasiki, Okayama and Himeji populations were similar to that of the univoltine Matsumoto population. In northern Japan, the Akita population showed a univoltine type of photoperiodic response, while the farther northern Sapporo population showed a critical photoperiod of about 15.5hr, only 1hr longer than in the southern populations. It was inferred that the southern populations were derived from a population accidentally introduced from southern Korea into Kobe or Osaka.View full abstractDownload PDF (591K) -
XII. Analyses of Damage to Eggplant and Sweet PepperAkira KAWAI1986 Volume 30 Issue 3 Pages 179-187
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe relationship between the density of Thrips palmi and the damage caused to eggplant and sweet pepper was studied in two vinyl-houses where the plants were cultivated. Four plots were designed and different density levels of T. palmi were maintained during the harvest period in each plot by chemical treatments. The number of larvae was positively correlated to the number of adults on the leaves of eggplant. The density of the larvae on the flowers of sweet pepper was always low, and no insect was found on the leaves when the density on the flowers was less than 1 adult per flower. Therefore, the number of adults per flower was used for the damage analysis of the damage caused to sweet pepper. T. palmi infestation did not affect the total yield of eggplant and sweet pepper. There was a negative correlation between the logarithmic value of the number of adults and the yield of uninjured fruits of eggplant and sweet pepper while a positive correlation was found between the logarithmic value of the number of adults and the percentage of injured fruits of eggplant and sweet pepper. The tolerable pest density for eggplant was estimated at 0.08 adult per leaf for the uninjured fruit yield assuming the permissible level of yield loss was 5%, while that for sweet pepper was 0.11 adult per flower. When the fruits with a slight injury on the pericarp were included into the group of uninjured fruits, the tolerable pest densities became very high.View full abstractDownload PDF (989K) -
Akio SHIMAMURA, Hitoshi WATANABE1986 Volume 30 Issue 3 Pages 188-195
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe morphogenesis of entomopoxvirus in the smaller tea tortrix, Adoxophyes sp., was studied by electron microscopy. At the initial stage of virus morphogenesis, crescent-shaped membranes which consisted of two unit membranes appeared around the periphery of the small viroplasm. These membranes thereafter formed the virus envelope. Immature virus particles were oval in shape and measured approximately 300×380nm. At the early stage of virus maturation, the viral core was formed inside the envelope and the beaded outline of the envelope was developed. Microspindles were formed in the spirals consisting of the endoplasmic reticulum and ribosomes. The nucleation and growth of the spheroids took place after the formation of some virus particles and microspindles, and spheroids grew larger by continuous accumulation of protein fibers. The final maturation of the virus which occurred when it was occluded into spheroids, was associated with the wavy appearance of the outer envelope, changes of electron density in the core and lateral body, appearance of rope-like structures in the core, and the reduction in virus size. The mature virus was oval in shape and measured approximately 170×210nm.View full abstractDownload PDF (6217K) -
Kazuo HIRAI1986 Volume 30 Issue 3 Pages 196-199
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSUsing the data on % damaged beans of soybean by the soybean podborer (dependent variable), a multiple regression equation was computed using independent variables based on the five-day mean temperature and cumulative precipitation for about eleven and half months from hatching (assumed as Sep. 1) to just before emergence (assumed as Aug. 15), and other independent variables over an 18-year period. A multiple nonlinear regression equation with the highest coefficient of determination, 0.927, was obtained by using the difference in arc sine transformed % damaged beans between the previous and the said year (Y) as the dependent variable, the sum of the five-day precipitation with r>0 (Z1) showing the positive correlation with % damaged beans, two variables of sum of the five-day temperature with r>0 and with r<0 (Z2, Z3), showing the positive or negative correlation with % damaged beans, and the arc sine transformed damaged beans of the previous year (Z4) as independent variables. Standard partial regression coefficients of Z4, Z1, Z2, and Z3 were-0.73, 0.42, -0.26, and 0.20, respectively.View full abstractDownload PDF (478K) -
Naoto YOKOI, Tamon YOSHII1986 Volume 30 Issue 3 Pages 200-201
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
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Hongxin MAO1986 Volume 30 Issue 3 Pages 201-204
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (1101K) -
I. Parasitic FliesChie GOTO, Hitoshi TSUTSUI, Hirohumi HAYAKAWA1986 Volume 30 Issue 3 Pages 204-205
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (232K) -
II. Parasitic WaspsChie GOTO, Hitoshi TSUTSUI, Hirofumi HAYAKAWA1986 Volume 30 Issue 3 Pages 205-207
Published: August 25, 1986
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (286K)
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