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[in Japanese]
1970 Volume 16 Pages
1-2
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese]
1970 Volume 16 Pages
2-3
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
4-7
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
8-11
Published: November 15, 1970
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Nobuhiko HOKYO
1970 Volume 16 Pages
12-15
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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Censuses of population density of the overwintering generation of the green rice leafhopper, Nephotettix cincticeps Uhler were carried out in a fallow after harvest of rice plants from early January to early April in 1968 and 1969 at an interval of about two weeks. Aggregation pattern of this insect in the field was examined by using the method of regression analysis of the two popu lation parameters, viz. "mean density (x)" and the Lloyd (1967)'s "mean crowding (X)", which was proposed by Iwao (1968). A linear regression, X=0.24+1.71x, was established with a high degree of fitness (r
2=0.98), which meant that a stable pattern of an overdispersed distribution was prevailed in the field. It was indicated that 20-40 samples (each sample covers insects within a circle of 30 cm in diameter) assured the relative precision (sx/x) of 0.20-0.30 or less in a wide range of mean densities. Some characteristic features of the distribution pattern in the fallow were also mentioned in relation to that in the paddy field.
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
15-17
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese]
1970 Volume 16 Pages
17-24
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
25-27
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
27-29
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
29-32
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
1970 Volume 16 Pages
32-34
Published: November 15, 1970
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Akira GOTOH
1970 Volume 16 Pages
34-37
Published: November 15, 1970
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Gotoh (1969) reported genera of plant-parasitic nematode found in uncultivated soils through out Japan. In the present paper, Pratylenchus specimens of above-mentioned collection were examined. Species found in such habitat are as follows: Pratylenchus penetrans, P. crenatus, P. neglectus, P. zeae, P. coffeae, P. vulnus, P. loosi, P. sp. 3, P. sp. 4 and P. sp. 5. P. neglectus, P. coffeae, P. vulnus, and P. loosi were considered to originate in arable lands or cultivated plants according to collection data. P. penetrans, P. zeae, P. sp. 3 and P. sp. 4 may be native in uncultivated lands. P. sp. 3, which closely resemblesd P. neglectus but differed from the latter in the shape of lip and stylet-knobs, was frequently found associated with graminaceous and other plants of uncultivated lands in Honshu and Kyushu. P. sp.4 was extracted from soils of various vegetations on tops and foot of Kudju-Mountains (700 and 1, 400-1, 660 m high). P. zeae, distributed in arable lands of Honshu and Kyu-shu, was found from uncultivated soils of the districts, too. It is to be noted that the nematode was extracted from soil around roots of azalea tree on the top of Mt. MyOken (1, 330 m high), Unzen-Mountains.
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
37-39
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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Tadatora OKADA
1970 Volume 16 Pages
40-41
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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Spodoptera larvae infected with nuclear polyhedrosis virus were obtained by feeding them on white-clover leaves dipped in polyhedral suspension. In the larvae, polyhedra first appeared in unmatured form, very rarely, in cells of three tissues, fat body, epidermis and tracheal matrix three days after the inoculation. Four days after, the polyhedra were recognized approximately 1/10 cells of the three tissues. The infected larvae were pink or beige, owing to coloration of the epidermis, especially in the outer surface. Five days after the inoculation, most cells of the three tissues showed the polyhedra. And the inclusion bodies appeared in some cells of testicular sheath and brains. The fat body began to break down, and the epidermis was speparated from the cuticle. The polyhedra were not recognized in nuclei of cells of muscle, epithelium of fore-, mid- and hind-guts, silk gland, Malpighian tubule. Six days after the inoculation, most of the larvae were killed by the polyhedrosis.
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Hirata INOUE
1970 Volume 16 Pages
42-43
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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In the warm region of Japan, the 28 spotted lady beetle is the most destructive insect pest of potatoes. Effect on this beetle of Disyston applied in soil to control the aphids as vector of the potato leaf roll virus was examined.
One gram of 5% Disyston granular per piece of seed potatoes, 66 kg per hectare, was app-lied in soil with fertilizer at planting time.
This dose reduced not only occurrence of the leaf roll but also the 28 spotted lady beetle remarkably.
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
43-44
Published: November 15, 1970
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
45-48
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
48-51
Published: November 15, 1970
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Manabu TANAKA, Kouichi INOUE
1970 Volume 16 Pages
51-54
Published: November 15, 1970
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In this paper, we deal with the rate of population increase of the citrus red mite on the citrus young trees in the outdoors at various seasons (1967-1969).
The purpose was to study the method for determination of the time necessary to spray acaricide from the present population of mites and their increase rate.
1) The increase rate of the citrus red mite population was largest in summer during periods with average 28°C and without rainfall. In these. condition, the population increased about 8.5 times in ten days. It was 2.6 to 7.0 times in summer-fall, 2.3 to 3.4 times in spring, 1.2 to 1.8 times in fall and 0.8 to 1.9 times in the rainy season.
2) In the rainy season, much rainfall strongly affected to the rate of population increase during periods of larva, nymph and adult.
3) The test on the relation between population density of the citrus red mite and its rate of increase in fall showed that, the rate of increase in mite population decreased severely at the densities of more than 80 eggs leaf at start.
4) The rate of population increase in ten days at summer and summer-fall seasons, on the leaf heavily infested by mite, decreased to about one sixth and one third of the uninfested ones.
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
54-56
Published: November 15, 1970
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Manabu TANAKA, Masahiro KOBAYASHI
1970 Volume 16 Pages
56-59
Published: November 15, 1970
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Chilocorus kuwanae is the most important predator of Unaspis yanonensis in Japan. It can be reared readily by Chrysomphalus bifasciculatus infested on squashes in insectary. This experiment was carried out in order to know the feeding habits as fundamental knowledge on mass production of the Coccinellid for control of Unaspis yanonensis.
In the individual feeding tests, each instar larva and adult were kept separate in a plastic vial of 13mm. long and 18mm. in diameter stuck to the surface of squash with paraffin and covered with organdie. Number of Chrysomphalus bifasciculatus infested on the surface of squash in the vial was 30 of adults or 60 of the second instar larvae in one test.
Observation was made every day at the fixed time during period of each stage, but in another test it was continued from the first instar larva to pupation and on adult it was made during three days.
Adults of Chilocorus kuwanae used for this test were as follows; non-gravid adult female of 3 days after emergence, gravid female of 15 days after emergence and ovipositing female of 27 days after emergence.
The amount of food consumed by larvae increased with progress of larval instars; the fourth instar larva consumed 25.74 of the second instar larva of scale or 9.45 of adult scale per day and it is greater than the amount of food consumed by other instar larvae on both stages of the scale. Total food consumption at larval period is 330.58 of the second instar larva of the scale or 107 of adult scales.
Duration of each larval instar shortens when they consumed adult scales compared with the second instar larva of them; when they consumed adult scales, the duration of the first to the fourth instar are 3.55, 3.55, 4.00 and 7.00 days respectively and the total length of larval period is 18.10 days and when they consumed the second instar larva of the scale, the duration of the first to the fourth instar are 6.25, 5.00, 7.57 and 8.75 respectively and the total length of larval period is 27.57 days.
Food consumption by adult Chilocorus kuwanae is the greatest in gravid female and the amount per day is 19.66 of adult scale or 53.33 of the second instar larva of the scale. The consumption by adult male is smaller than by female.
From these results adult Chrysomphalus bifasciculatus seems to have better quality for development of Chilocorus kuwanae, therfore it will be better food for mass production of this Coccinellid. From the feeding capacity of larval period the maximum number of the Coccinel-lids which can be reared on a squash is estimated; about 300 of Coccinellids can be reared on a squash with surface of 960cm2, because about 33000 adults of the scale infest on this squash.
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
59-67
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
1970 Volume 16 Pages
68-69
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
70-71
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
72-74
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
75-77
Published: November 15, 1970
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
77-79
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
79-80
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
81-82
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
83-84
Published: November 15, 1970
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Mochiyuki SONDA
1970 Volume 16 Pages
85-86
Published: November 15, 1970
Released on J-STAGE: May 22, 2009
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The Cryptolestes spp. in Kyushu was surveyed during 1968-1969. A total of 225 samples of wheat, barley, bran, rice, spillage and sweepings were collected from 36 localities in Kyushu. Out of six species of Cryptolestes described from stored products, three species, C. turcicus, C. ferrugineus and C. pusillus, were confirmed. It was pointed out that the dominant species was C. pusillus, a tropical one, which was considered to overwinter indoors in the southern parts of Kyushu.
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
87-89
Published: November 15, 1970
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Fukuji NONAKA, Shuntaro TANOUE
1970 Volume 16 Pages
89-91
Published: November 15, 1970
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As the result of periodical isolation of rice stem rot fungi during the rice growing season, Leptosphaeria salvinii, one of stem rot fungi, was isolated from diseased plants through the periods, but Helminthosporium sigmoideum var. irregulare, another of stem rot fungi, was first isolated after the heading stage. Similar result was obtained by the isolation of the fungi from the diseased rice plants collected at south plane areas in Saga Prefecture. While, pathogenicity of L. salvinii to sheath was severer than that of H. sigrnoideuin var. irregulare on the test of inoculation to pot cultured plants.
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Tadahiro NISHIZAWA, Shigematsu KUHATA, Hideo TABEI, Tohru SATO, Takao ...
1970 Volume 16 Pages
91-94
Published: November 15, 1970
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For the purpose of forecasting the bacterial leaf blight of rice plants, the successive changes in the population of Xanthomonas oryzae bacteriophage in irrigation water were examined periodically during the rice growing period in diseased area of Miwa-machi, Fukuoka Prefecture. Thus obtained results were analysed relating to the disease occurrence.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
1970 Volume 16 Pages
94-95
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
95-97
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
97-99
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
100-101
Published: November 15, 1970
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
102-103
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
103-105
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
105-108
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
108-109
Published: November 15, 1970
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[in Japanese], [in Japanese]
1970 Volume 16 Pages
109-112
Published: November 15, 1970
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[in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
113-114
Published: November 15, 1970
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Fukuji NONAKA, Kiyotaka KAWAKAMI
1970 Volume 16 Pages
114-116
Published: November 15, 1970
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Mycelial growth of Fusaruim solani f. pisi and Fusarium oxysporum pathogenic to garden pea was retarded on the medium containing pisatin, a phytoalexin from the plant, and pisatin content of the medium decreased markedly after 30 days culture of these fungi. Pisatin was slightly inactivated by mixing it into the culture filterates of these fungi and extent of pisatin inactivation did not varied to the duration of culture. Pisatin was entirely disappeared when it was mixed with spore suspension of F. solani f. pisi.
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[in Japanese]
1970 Volume 16 Pages
117-118
Published: November 15, 1970
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[in Japanese]
1970 Volume 16 Pages
118-120
Published: November 15, 1970
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Fukuji NONAKA, Setsuko SUGAWARA, Zyunko HAGA
1970 Volume 16 Pages
120-122
Published: November 15, 1970
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Spore germination of Fusarium solani f. pisi and Cochliobolus miyabeanus was stimulated by addition of 25 and 50 ppm kinetin or benzylkinetin to those spore suspensions, on the other hand that of Botrytis fabae and Botrytis cinerea was inhibited. Exudation of pisatin, a phytoalexin of garden pea from the plant, in the diffusate upon the pea pods was slighly enhanced by the inoculation of F. solani f. pisi spore suspension containing 25 ppm benzylkinetin. These results indicate that the stimulation of spore germination by benzylkinetin is correlated with the increase of pisatin exudation.
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[in Japanese]
1970 Volume 16 Pages
122-124
Published: November 15, 1970
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
1970 Volume 16 Pages
124-125
Published: November 15, 1970
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