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Volume 6 (1971)
- Issue 4 Pages 147-
- Issue 3 Pages 97-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 6, Issue 3
Displaying 1-10 of 10 articles from this issue
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Tuyosi SUGIMOTO1971 Volume 6 Issue 3 Pages 97-104
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSThe present study was carried out to clarify the competition among larvae of a leaf mining fly, Phytomyza ranunculi, in the leaf of a host plant, Ranunculus asialicus LINNAENUS.The larval mortality in the leaf and the percentage of larvae that moved out from a leaf to a petiole increased with increase of the number of hatching larvae per cm2 of the leaf area.It was found that most of the dead larvae in a leaf were young instars. The mortality of young larvae was high when the difference in development among individuals in the same leaf was large because the survival of the late-developed larvae was much lowered due to deterioration of the leaves, mainly caused by the feeding activity of the early developed larvae. In many cases, the larvae which moved out to the petioles or branches tended to be smaller than those that emerged from leaves. Also, the early emerged pupae were larger in size than the late emerged ones. The maximum density of mature larvae emerged from a leaf was about 2 per cm2 of leaf area when eggs were laid only for two days but it was much lower when the oviposition period extended over five days.View full abstractDownload PDF (692K) -
Kazuyoshi MIYASHITA1971 Volume 6 Issue 3 Pages 105-111
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSSpodoptera litura F. was reared under constant and alternating temperature conditions.From the results of rearings on beet leaves under constant temperatures, the threshold temperatures for the development of the egg, larva, prepupa, and pupa were estimated to be 10.1°, 10.6°, 12.0°, and 9.0°C, respectively. The threshold temperature and the thermal constant for development from the egg to the adult form were also estimated to be 10.3°C and 526.3 day-degrees. It was considered that the development of the larvae and the pupae tended to be accelerated under alternating temperatures as compared with that under constant temperatures.View full abstractDownload PDF (587K) -
Shozo KAWAI, Kazuo TAKAGI1971 Volume 6 Issue 3 Pages 112-118
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSTwo subterranean species of the Ortheziidae found in tea gardens in Shizuoka-ken, Japan, are described. One of these species, Newsteadia kanayana (n. sp.), is close to Newsteadia minima from North America but distinct in the spine band pattern. The other species, Nipponorthezia ardisiae, which was recorded as a root-feeder on Ardisia Japonica and citrus, is recorded from tea for the first time.View full abstractDownload PDF (698K) -
Koji HORI1971 Volume 6 Issue 3 Pages 119-125
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSThe frequency, duration and quantity of feeding of Lygus disponsi were estimated.The net consumed quantity of host sap was estimated by subtracting the weight loss of the food by evaporation from the total loss. The frequency of piercing differed only little among different instar nymphs. The frequency of piercing in group rearing (5.2/hr) was more than twice as many as that in individual rearing (about 2/hr). The frequency of feeding seemed to be 1-2 per hr. The duration of feeding ranged from 3 min to more than 1 hr. The consumed quantity of food increased gradually from the 1st (2mg/day)to the 5th instar (8 mg/day), and was usually a little higher in the fermale than in the male. The total amount of feeding throughout the nymphal stage was 82.54 mg per bug. The quantity of food consumed by the adult just after emergence (7.5 mg/day) was about equal to that of the 5th instar nymph, but soon it increased sharply up to 13 mg per day, when the adult was 5 days old. Then it decreased rapidly to 4 mg per day, when the adult was 12 days old, and thereafter remained nearly constant until 17 days old.View full abstractDownload PDF (576K) -
Etusji SUGAI, Setsuko SUZUKI1971 Volume 6 Issue 3 Pages 126-130
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSWhen normal females of Bombyx mori L. were mated with males that had received 50 μg of apholate at the end of the 5th instarm approximately 14-29% of their eggs hatched.The development of these F1 progeny was delayed and the larval and pupal mortality was greater than that of the control. Also, when F1 males that exhibited normal development were crossed with untreated females, the oviposited eggs were nearly sterile. Cytological observation on the testes showed that the inherited male sterility obtained in this experiment was caused by the abnormality of the eupyrene spermotozoa.View full abstractDownload PDF (675K) -
Toshio NAKASHIMA1971 Volume 6 Issue 3 Pages 131-137
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSThe associated fungi and the spore storage organs of the ambrosia beetle Crossotarsus niponicus were investigated. Stained serial sections of the adult beetles showed that at the back of the preoral cavity of the adult female, a single spherical mycetangium existed, and surrounding this sphere a sponge-like tissue which also contains fungus material was present.From the fluid contained in the preoral cavity of all of the female specimens, Absidia glauca HAGEM was isolated. From 2 or 3 individuals, Cephalosporium mycophilum (CORDA) TUBAKI, C.acremonium CORDA, Chaetomium indicum CORDA were isolated together with A. glauca. In the beetle C. niponicus, the male bored the galleries, while the female stored and propagated the fungi; in other words, one pair of the beetles formed one gallery system.View full abstractDownload PDF (1185K) -
Hiromu AKAI, Masatoshi KOBAYASHI1971 Volume 6 Issue 3 Pages 138-139
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
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Yoshio TAMAKI, Hiroshi NOGUCHI, Takeshi YUSHIMA, Chisato HIRANO1971 Volume 6 Issue 3 Pages 139-141
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
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Etsuji SUGAI, Setsuko SUZUKI1971 Volume 6 Issue 3 Pages 141-142
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
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Ching-Fun CHANG, Saburo TAMURA1971 Volume 6 Issue 3 Pages 143-145
Published: September 25, 1971
Released on J-STAGE: February 07, 2008
JOURNAL FREE ACCESSDownload PDF (408K)
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