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Tokuhiro KATO, Wataru HASAMA, Suzumi MORITA
1990 Volume 36 Pages
1-4
Published: October 30, 1990
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Naoshi OMATSU, Shoichi IZUMI, Ikuo SHINYASHIKI
1990 Volume 36 Pages
5-7
Published: October 30, 1990
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Takeshi YOKOYAMA, Kunihide OKUHARA
1990 Volume 36 Pages
8-10
Published: October 30, 1990
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Jun-ichiro YAMAGUCHI, Minoru INADA, Hatsuko MIKURIYA, Masafumi MATSUZA ...
1990 Volume 36 Pages
11-13
Published: October 30, 1990
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Hiroshi KAMIUNTEN, Tosinori FUJITA
1990 Volume 36 Pages
14-15
Published: October 30, 1990
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Tomio USUGI, Shinji KOTANI, Masaaki NAKANO, Takaharu HAYASHI
1990 Volume 36 Pages
16-18
Published: October 30, 1990
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Shoichi IZUMI, Saburo FUKAMACHI
1990 Volume 36 Pages
19-21
Published: October 30, 1990
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Norio NISHIMURA, Kazuichi KUDO
1990 Volume 36 Pages
22-25
Published: October 30, 1990
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Takuo MATSUMOTO, Yasuo SONKU, Daichi NAKAZIMA
1990 Volume 36 Pages
26-29
Published: October 30, 1990
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Tsuruo KAYAMURA, Fumio NAMIKI, Manabu UMEKAWA
1990 Volume 36 Pages
30-33
Published: October 30, 1990
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Eiichirou SOUDA, Sigehiro BABA, Soichi SAKAGUCHI, Mituhiro MURAKI
1990 Volume 36 Pages
34-35
Published: October 30, 1990
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Yoshiyuki KUSHIMA, Takeo MIURA
1990 Volume 36 Pages
36-37
Published: October 30, 1990
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Takahiko OTA, Soichi SAKAGUCHI
1990 Volume 36 Pages
38-40
Published: October 30, 1990
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Kazutoshi MATSUO
1990 Volume 36 Pages
41-45
Published: October 30, 1990
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Hiroshi IKEDA, Toshinobu NAKAMURA
1990 Volume 36 Pages
46-47
Published: October 30, 1990
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Soichi SAKAGUCHI, Hiroyuki ETO, Eiichirou SOUDA
1990 Volume 36 Pages
48-51
Published: October 30, 1990
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A fungal disease was observed on seedling of asparagus grown under vinyl house conditions in the spring of 1989 in Nagasaki Pref., Japan. The common symptom was damping-off of seedlings. The mycelium, suggestive of Rhizoctonia sp., was found on chlorotic, water soaked or brownish host substrate. The isolate (NR-59) formed dilutery brown colonies with aerial hyphae and sclerotia, but without clear zonation on culture media. The fungus grew well on potato dextrose agar over a temperature range of 15-34°C, optimum near 28°C. The hyphal branches arised at approximately right angles with septum near to the junction. The width of the mature main hyphae was 6-10 μm (mean 8 μm) and the number of nuclei per cell was 4-6 (mean 5.2) . The fungus was identified as Rhi;octonia solani KUHN. According to the anastomosis grouping by J. R. Parmeter, Jr. et al. (1969), the isolate belonged to AG 4. The cultural type of the isolate by B. Watanabe et al. (1966) was type III A. This appears to be the first record of damping-off on cultivated asparagus in Japan.
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Kazuo HOKAMA
1990 Volume 36 Pages
52-55
Published: October 30, 1990
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Fukuji NONAKA, Tomoki MOTOMURA, Kinji TANAKA
1990 Volume 36 Pages
56-58
Published: October 30, 1990
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Southern blight like disease on cultivated water chestnut (Trapa bispionosa Roxb.) leaves occurred in paddy fields in August in 1989 in Saga Prefecture. Corticium rolfsii Curzi, causal fungus of southern blight, was isolated from lesions of infected leaves. Isolates of C. rolfsii from water chestnut were compared with isolates from many other plants in respect to their mycelial growth and pathogenicity: No differences in the mycelial growth were found between isolates from water chestnut and that from the other plants. The optimum temperature of both isolates on potato sucrose agar was about 30°C. Isolates from water chestnut were as severely pathogenic against the leaves of water chestnut, and seedlings of soy bean and burdock as isolates from other plants by artificial inoculation. From the experimental results, it was considered that isolates from water chestnut were identical with C. rolfsii isolated from other plants.
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(1) Classification of symptoms and charateristics of occurrence
Norimitu SAKAGUCHI, Tamotu KIKU
1990 Volume 36 Pages
59-63
Published: October 30, 1990
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Takaharu ISODA, Yutaka GYOUTOKU
1990 Volume 36 Pages
64-67
Published: October 30, 1990
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Two branches suffering from a Satsuma-dwarf virus were subjected to top grafting in 1959 and the propagation of said Virus to adjacent trees was investigated in 1984 with the result that six trees suffered from the Satsuma-dwarf virus.
All of the infected trees showed severe symptoms, whereas the adjacent trees developed no symptoms at all and also were negative in an ELISA test. Therefore, the adjacent healthy trees were continuously investigated up to 1988. As a result, a positive reaction was confirmed in the ELISA test and, in 1989, boat-form leaves and spoon-form leaves characteristic of the Satuma-dwarf virus were severely generated. From the foregoing, it was suggested that the Satsuma-dwarf virus was slow in propagation but certainly propagated to adjacent trees.
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Hiroko MAMETSUKA, Nobuya TASHIRO, Mitsuo SADAMATSU, Kenji YAMATSU
1990 Volume 36 Pages
68-71
Published: October 30, 1990
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Nobuyuki KAWASAKI, Hiroko MAMETSUKA, Nobuya TASHIRO
1990 Volume 36 Pages
72-75
Published: October 30, 1990
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It was revealed by a field survey that apples cultured in the northern highlands of Saga Prefecture were heavily damaged by early leaf drop caused by alternaria leaf spot (Alternaria alternata apple pathotype) and leaf blotch (Diplocarpon mali). The leaf spot occurred at the beginning of the rainy season in June and the cultivar 'Fuji' was severly affected by these diseases. The strong tolerance of the strain of Alternaria alternata apple pathotype to polyoxin, a fungicide for control of the disease, was found in one orchard of the eleven orchards surveyed. On the other hand, the intermediate strains were found in ten orchards. Leaf blotch rapidly increased in the middle of the fruit growing season. In addition to the diseases mentioned above, scab (Venturia inaequalis) and gray mold (Botrvtis cinerea) also occurred in several orchards. Leaves, flower buds and young fruits were infested with aphids, weevils, leaf rollers and caterpillars at flowering and fruit-setting periods. After the end of July, aphids, leafrollers, fruit moth larvae and apple leafminer occurred.
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Akira MORITA
1990 Volume 36 Pages
76-80
Published: October 30, 1990
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Mitsuo SADAMATSU, Nobuya TASHIRO
1990 Volume 36 Pages
81-84
Published: October 30, 1990
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Kiyotoshi YOKOMIZO, Nobuyuki NANBA, Yoshio OGAWA
1990 Volume 36 Pages
85-89
Published: October 30, 1990
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Kazushige SOGAWA, Tomonari WATANABE
1990 Volume 36 Pages
90-94
Published: October 30, 1990
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Hirotsugu KIYOTA, Kunihide OKUHARA
1990 Volume 36 Pages
95-96
Published: October 30, 1990
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Koichi TANAKA, Hikaru KAZANO, Shozo ENDO
1990 Volume 36 Pages
97-99
Published: October 30, 1990
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Insecticide susceptibilties of the first instar nymphs of three spiders, a wolf spider (Pardosa pseudoannulata) and two dwarf spiders (Ummeliata insecticeps and Gnathonarium exsiccatum), inhabiting paddy fields were examined by the dipping method against five insecticides, diazinon, phenthoate, BPMC, cardaryl and etofenprox. The three spiders were most susceptible to etofenprox. Pardosa pseudoannulata was rather susceptible to phenthoate and carbaryl. The other insecticides did not have high toxic activity to the three spiders. The LC
50 of the insecticides tested except for etofenprox to P. psuedoannulata was 4 to 47 times greater than that for the ofher two spiders. The susceptibility to etofenprox was compared between the first instar nymphs and the female adults of G. exsiccatum. The LC
50 value for adults was 35 times greater than that for the first instar.
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Shozo ENDO, Hikaru KAZANO, Koichi TANAKA
1990 Volume 36 Pages
100-102
Published: October 30, 1990
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The changes in insecticide susceptibility of the small brown planthopper (SBPH) selected with etofenprox and buprofezin were studied.
The LD
50 value to etofenprox of SBPH selected with etofenprox was 6.7 times as large as that of the parent colony. The LD
50values to organophosphates and carbamates of the etofenprox-selected colony did not differ from those of the parent colony.
The LC
50 value to buprofezin of the buprofezin-selected colony was approximately the same as that of the parent colony. The LD
50 values to organophosphates, carbamates and synthetic pyrethroids of the buprofezin-selected colony were almost the same as those of the parent colony.
Aliesterase activities of SBPH did not increase by etofenprox or buprofezin selection.
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Hideaki INOUE, Saburo FUKAMACHI
1990 Volume 36 Pages
103-107
Published: October 30, 1990
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Yoshio MIYAHARA
1990 Volume 36 Pages
108-112
Published: October 30, 1990
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Moths of the rice leaf roller, Cnaphalocrocis medinalis GUENEE and the Hawaiian beet webworm, Hymenia recurvalis FABRICIUS resting on seashore vegetation are found annually along the Hyuga coast during the summer and autumn. These moths appear to be a temporary landed population in the course of migratory flight. In 1989, H. recurvalis moths were collected from seashore vegatation using an insect net. The collected moths were sexed and were classified according to the deficency of cilia which occur on the outer margin of the fore wing to clarify the freshness of the moth. Furthermore the female moths were dissected under a binocular microscope to examine both the ovaries and spermatophores. Fresh moths accounted for more than 90% of the collected moths. About 90% of the ovaries of female moths were either undeveloped or partially developed and the mating rate was 12.8%. In contrast, female moths collected at the breeding site were sexually mature and had already mated. The mating rate of female moths was highly correlated with the percentage of mature moths.
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Yoshitaka HAYASHI, Kiyofumi NAGAI, Takashi TODAKA, Takashi TSUNEYOSHI, ...
1990 Volume 36 Pages
113-115
Published: October 30, 1990
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Hidemi KAMIWADA, Koujin NAKAGAWA, Shingo OYA
1990 Volume 36 Pages
116-119
Published: October 30, 1990
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Akira TANAKA, Saburo HIGO, Michinori KOUZUMA
1990 Volume 36 Pages
120-122
Published: October 30, 1990
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Keiji YASUDA, Tsuguo KOHAMA
1990 Volume 36 Pages
123-125
Published: October 30, 1990
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Shingo ÔYA, Hidemi KAMIWADA
1990 Volume 36 Pages
126-128
Published: October 30, 1990
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Masaaki ARAKI, Michito HAYASHIDA, Makoto SUDO
1990 Volume 36 Pages
129-131
Published: October 30, 1990
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Hideo UEMATSU
1990 Volume 36 Pages
132-134
Published: October 30, 1990
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Various-sized females (3 to 8 mg) were paired with various-sized males (3 to 7 mg) in a glass tube (30 mm in diameter, 200 mm in length) for a period of 2 days. Pupal weight was used as an index of adult size. When the difference in body weight between a female and a male was 0 to 2 mg, a large proportion of female (75.2 to 92.7%) succeeded in mating and laid fertilized eggs. However, when the difference ex-ceeded 3 mg, the probability of a successful mating decreased by 50. 0 to 76.9%. This suggests that 3 mg of inter-sexual difference in weight has some ill effects on mating.
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Hirata INOUE, Kenji KAWAMOTO
1990 Volume 36 Pages
135-138
Published: October 30, 1990
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Akira TANAKA, Masatoshi HORIKIRI, Kaoru TAKEMURA, Katashi MATSUMOTO
1990 Volume 36 Pages
139-142
Published: October 30, 1990
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The application of synthetic pheromone has been considered to be effective in controlling the diamondback moth, Plulella xylostella, when used in fields larger than 3ha. In 1989 the effect of synthetic sex phermone on the diamondback moth was examined in a small field (31a) by counting the number of adults caught by the pheromone traps and that of living larvae on the crop. The examination indicated that the pheromone made it possible to reduce the number of applications of insecticides from 7-8 (control) to 4-5. The pheromone was most effective around the center of the field, but adults and living larvae were more abundant in an area 5-10 m from the edge of the field than in other areas. The pheromone was considered to be effective even in small fields when some other control methods are added to the application of pheromone, particularly to control moths near the field edge.
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Koji YASUDA, Masaichi TSURUMACHI
1990 Volume 36 Pages
143-145
Published: October 30, 1990
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Susumu MAKINO, Kazutoshi IKEDA, Manabu HORIMOTO, Toshihiko NISHIOKA, T ...
1990 Volume 36 Pages
146-149
Published: October 30, 1990
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Tomoyuki NAKAGAWA
1990 Volume 36 Pages
150-154
Published: October 30, 1990
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Yutaka GYOUTOKU, Tomotoshi KASIO
1990 Volume 36 Pages
155-159
Published: October 30, 1990
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Oligota spp. (0. kashimilica benefica and 0. yasumatui) are important predators of the citrus red mite Panonycus citri in citrus orchards in Japan. In this paper, the toxicity of some pesticides generally used for citrus pest control has been evaluated to this predator, to establish a selective spray program for citrus pest control. Two way tests of direct and residual toxicity for adults were carried out in the laboratory at 25±1°C. Of 30 insecticides tested, only BT, petroleum oil and buprofezin showed little or no toxicity to the beetles although these chemicals were tested at commercial concentrations. The other insecticides showed high toxcity in both direct and residual toxicity. Of 8 acaricides tested, most showed moderate to low toxicity but cyhexatin, was highly toxic. Of 6 fungicides tested, all showed little or no toxicity to the beetles.
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Takeshi TERAMOTO, Mitsuhiro MURAKI, Toshio ITAYAMA, Kimio ONO
1990 Volume 36 Pages
160-163
Published: October 30, 1990
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Syoichi HASHIMOTO, Shin-ichirou SHOBU, Kanetosi KUSIGEMATI
1990 Volume 36 Pages
164-168
Published: October 30, 1990
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Tomotoshi KASHIO, Takafumi TSUTSUMI
1990 Volume 36 Pages
169-172
Published: October 30, 1990
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Takafumi TSUTSUMI, Tomotoshi KASHIO, Syoichi HASHIMOTO, Yutaka GYOUTOK ...
1990 Volume 36 Pages
173-176
Published: October 30, 1990
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In a field application test, banding of polyurethane foam sheets (30×500 mm) containing B. brongniartii (conidia 10
8/cm
2), around the lower part of the trunk of citrus trees, resulted in 57-100% mortalities of adult beetles of A. malasiaca, at the dosage of 1 sheet per tree. High mortalities, 84-100%, were also obtained at the same dosage when sheets were hung at the branching part of the citrus trunk. The application of the sheets at the rate of 1 sheet per 2 trees and 1 sheet per 4 trees, resulted in 55-73% and 46% mortality respectively. The time required for the application of the sheets in citrus orchards, were 40-60 minutes/10a by the hanging method, while the banding method required 90-120 minutes/10a. These results showed that hanging polyurethane foam sheets was an effective and practical method for application of B. brongniartii.
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Ippei KAI, Minoru NARAHARA, Tomotoshi KASHIO, Syoichi HASHIMOTO
1990 Volume 36 Pages
177-180
Published: October 30, 1990
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Hideo SAITA, Yoshinari TSURU, Masazumi SHINOKURA, Ken-ichi YAMADA, Tak ...
1990 Volume 36 Pages
181-182
Published: October 30, 1990
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