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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 2
Displaying 1-15 of 15 articles from this issue
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IV. Effects of the Systemic Organophosphates on the Nitrification of Soil and on the Growth and Yield of PotatoTakashi KOBAYASHI, Shizue KATSURA1968 Volume 12 Issue 2 Pages 53-63
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSWhen applied as a soil treatment, 6kg PSP-204 or Di-Syston granules per 10a gave an increase of nitric-nitrogen (NO3-N) in volcanic ash soil of Kuriyagawa, Morioka, after about 25 days from the application at planting time. This trend of NO3-N was kept for about 40 days with PSP-204 and about 50 days with Di-Syston, respectively. These insecticides had an unfavourable effect in delaying initial growth of the plants, but brought a greater increase of growth after about 30 days from the emergence of potato plants, finally giving higher yield than untreated plants. Having analyzed nutritional components of potato plants, a larger amount of nitrogen absorbed was estimated in treated plots. From these results it might be considered that the acceleration of growth and the higher yield in treated plots are due to the increasing soil nitrification during a period where growth of potato plants are much sensitive to nitrogen level of soil. It was also suggested that the increase of NO3-N in soil may be resulted from a feeble “partial sterilization effect” of the insecticides, being prominent in a certain range of soil fertility or amount of nitric fertilizer per area.View full abstractDownload PDF (1544K) -
II. Relationship between the Damage on Citrus Root and the Individual Numbers of the Citrus Ground Mealy Bug, Rhizoecus kondonis KUWANAMasayoshi YOSHIDA, Shunji ANDO1968 Volume 12 Issue 2 Pages 64-69
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSEstimation of the damage on citrus root caused by the citrus ground mealy bug, Rhizoecus kondonis, was made with citrus seedlings cultured in the apparatus deviced by the senior author. When new roots grew, 50, 100, 200 or 500 individuals of insects were put into the upper part of each equipment respectively. Weight of new and old roots was measured at the 40th days after the start of rearing. As the number of insects increased, weight of new root decreased rapidly, but that of old one remained nearly invariable. This result implies that this species mainly injures new roots. The relation between the number of insects and the weight of new roots was shown by a smooth decreasing curve with a special index. Percentage of the damage to new roots measured in weight loss comparing with the non-damaged roots were about 12.0, 26.0 and 47.2% for the number of insects of 50∼100, 200 and 500, respectively. The damage in actual orchards should be very serious, because the individual number of 500 will be attained very rapidly by the high egg-production, unisexuality and fast development of this insect.View full abstractDownload PDF (2561K) -
III. The Toxic Effects of Various Insecticides and Acaricides on the Resistant Mites to Phenkapton and EstoxMasaru OSAKABE1968 Volume 12 Issue 2 Pages 70-75
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe author reported in the previous paper (OSAKABE, 1968) that the resistant mites to Phenkapton and Estox (O, O-dimethyl s-(1-methyl-2-ethylsulfinyl)-ethyl phosphorothioate) have been widely distributed in Japanese tea plantations. This paper dealt with the atoxic effects of various insecticides and acaricides on the resistant mite to Phenkapton and Estox. In the laboratory tests, Kelthane, Chlorobenzilate, Milbex (4-chlorophenyl 2, 4, 5-trichlorophenylazosulfide and Dimite mixed), Newmite (Ovex, Aramite and Dimite mixed), and Acricid (2-(sec-buthyl)-4, 6-dinitrophenyl β, β-dimethylacrylate) showed good effects to the resistant mites, but some of organophosphorous compounds such as EPN, Phenkapton, Estox, Imidan, Vamidothion, and Malathion showed less toxic to the mites.View full abstractDownload PDF (763K) -
V. Absorption, Distribution and Fate of Carbon-14-labeled DDT Applied Topically to the LarvaeHitoshi WATANABE, Ryuzo KOBARA1968 Volume 12 Issue 2 Pages 76-80
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSAbsorption, excretion, distribution and metabolism of 14C-ring labeled p, p'-DDT in the silkworm, Bombyx mori L., as well as the American cockroach, Periplaneta americana L., were studied. The radioactive DDT, topically applied to silkworm, was rapidly absorbed and widely distributed internally. Of the tissues examined, the fore-gut, the Malpighian tubles, and the gonads contained larger amounts of radioactivity per unit of weight. Thin-layer chromatographic analyses of metabolites of the silkworm treated with radioactive DDT showed that the radioactivity in the tissue and the feces was mainly due to DDT, DDE and two unidentified metabolites. On the other hand, the radioactivity absorbed in the American cockroach which had been treated with radioactive DDT mainly distributed in the oesophagus, crop, gizzard, enteric coecum, and Malpighian tubles. Chromatographic evaluation of both tissue and fecal metabolites of radioactive DDT demonstrated the presence of DDE and at least three unidentified metabolites.View full abstractDownload PDF (1220K) -
Jûtarô HIRAO1968 Volume 12 Issue 2 Pages 81-85
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe laboratory tests demonstrated that a planthopper, Delphacodes (?) albifascia MATSUMURA, has an ability to acquire the black-streaked dwarf virus and transmit it to the rice plant. This species was recorded as the third planthopper vector of this virus. The virus transmission occurred in both nymphs and adults; the adults could transmit the virus acquired in their nymphal stage. The virus persisted in the vector throughout its life span. Nevertheless, the infective insects failed to transmit the virus to the plant for many days in succession; transmissions were often intermittent and erratic. The latent period of the virus in the vector averaged approximately 13 days at 25°C. The percentage of infective insects and of transmission rose with an increase of acquisition feeding time and of inoculation feeding one, respectively; both of these threshold periods were within 15min. The virus was not congentially transmitted through the eggs of the vector. During a course of the experiments a maximum of 50% of infective insects was obtained from the population with 3-day acquisition feeding period at 20°C.View full abstractDownload PDF (1200K) -
Nobuo GOKAN1968 Volume 12 Issue 2 Pages 86-94
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe developmental process of the compound eye in Maladela castanea was observed. The third instar larvae of this insect collected from the field were reared at a constant temperature of 25°C, and used succeedingly as the material of larvae, pupae and adults. The compound eye is formed by differentiation of the hypodermis situated at the anterior part of the lateral ocelli of the larva. The larval ocelli are withdrown inward with the approach to pupation. The cornea which appears originally as a thin membrane becomes suddenly thicker during 9 to 10 days after pupation. The crystalline cone cells seem to have been concerned with the formation of the cornea. The four crystalline cone cells begin to secrete cone forming substance as soon as pupated, and the four cone units fused each other into a lump of cone four days after pupation. However, the adult-type crystalline cone is accomplished more than one day after emergence. The retinula is composed of eight cells, one nucleus among them is situated at the proximal area of the ommatidium throughout the development. There are two iris cells containing the pigment granules abundantly. In early stage their nuclei are distributed at the distal part of the crystalline cone cells, but later move proximally with the progress of development. The retinular pigment cells are six in number. Their nuclei are early located near the basement membrane, but afterward move distally until they reach a slight distal level of the nuclei of retinular sense cells after more than 24hr from emergence. Then the development of the compound eye is accomplished.View full abstractDownload PDF (7134K) -
Hideo KITANO1968 Volume 12 Issue 2 Pages 95-97
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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Hirosi FUSE, Masataro SATO1968 Volume 12 Issue 2 Pages 97-99
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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Masao OHNO1968 Volume 12 Issue 2 Pages 99-100
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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Hiroshi NOGUCHI, Yoshio TAMAKI, Atsushi SUGIMOTO1968 Volume 12 Issue 2 Pages 100-102
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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[in Japanese]1968 Volume 12 Issue 2 Pages 103-107
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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[in Japanese]1968 Volume 12 Issue 2 Pages 108-110
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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[in Japanese]1968 Volume 12 Issue 2 Pages 111-113
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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[in Japanese]1968 Volume 12 Issue 2 Pages 114-116
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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1968 Volume 12 Issue 2 Pages 117
Published: June 25, 1968
Released on J-STAGE: February 12, 2009
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