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Akira SHINKAI, Tomio USUGI, Masaaki NAKANO
1987 Volume 33 Pages
1-3
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Takeshi YOKOYAMA, Kunihide OKUHARA
1987 Volume 33 Pages
4-8
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Daisaburou YOSHIMURA, Keisuke YOSHIDA, Mari OTOFUJI
1987 Volume 33 Pages
9-12
Published: October 30, 1987
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2. Effect of the period of top dressing on the occurrence of rice bacterial grain rot.
Hiroaki TORIGOE, Nobuaki KAZIYA, Shoichi IZUMI, Yoshio YANAGIDA
1987 Volume 33 Pages
13-15
Published: October 30, 1987
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Mari OTOFUJI
1987 Volume 33 Pages
16-18
Published: October 30, 1987
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Soichi SAKAGUCHI, Katsumi KATAYAMA, Isaburo ICHIKAWA, Kimio ONO, Yasuh ...
1987 Volume 33 Pages
19-20
Published: October 30, 1987
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Tomio USUGI, Masaaki NAKANO, Akira SHINKAI
1987 Volume 33 Pages
21-23
Published: October 30, 1987
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Masamichi KAN, Akira KATSUKI
1987 Volume 33 Pages
24-26
Published: October 30, 1987
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Nobuya TASHIRO, Takahito SUZUI, Kiyotaka MIYASHITA, Yoshimitsu MATSUO
1987 Volume 33 Pages
27-32
Published: October 30, 1987
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In recent years, russet-like disease of potato under mulching culture in winter and spring has been causing problems in Saga prefecture. An actinomycete was isolated from potato plants with russet-like disease, which caused identical symptoms in inoculation tests. This actinomycete was found to belong to the genus Streptomyces based on the morphological characteristics and cell wall type. It apparently differed from Streptomyces spp. causing potato common scab in the spore chain morphology, spore surface structure and DNA-DNA homology values. The pathogenic Streptomyces sp. grew well at a temperature of about 37 C but did not grow in a medium at pH 5.0. In the field, the damage was more severe under mulching culture than non-mulching culture and in soil with a neutral pH value compared with acid soil. Fungicide treatment for the control of russet-like disease was not effective. It is considered that if potatoes are cultivated in fields with a soil DH below 5.0. it may be possible to decrease the damage.
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Masaaki NAKANO, Tomio USUGI, Akira SHINKAI
1987 Volume 33 Pages
33-35
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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The spread of soybean mosaic virus (SMV), from infected soybean plants to the surrounding virus-free soybean seedings grown in pots by aphids occurring naturally as vectors in 4 or 5days, was prevented by machine oil treatments, followed by the application of fenvalerate·MEP. In spring, when soybeans grown in the fields were treated weekly by machine oil, the basic infection rate of SMV was reduced by two thirds compared with the control plots. In summer, a large number of Aphis glycines were observed on the soybeans in Chikugo. After ethylthiometon was applied on the fields, although no apterae aphids were observed on the plants for more than one month, SMV was able to spread. There were no significant differences in the SMV incidence between the ethylthiometon-treated and untreated plots.
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Taturo MUTA
1987 Volume 33 Pages
36-38
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Two sugarcane rusts caused by Puccinia melanocephala H. & P. Sydew and Puccinia sp. were observed in Kagoshima Prefecture in 1984. The shape of the uredospore and teliospore of Puccinia sp. was similar to that in Puccinia kuehnii Butler except that paraphases could not be found in the uredinium and telium. Disease development caused by P. melanocephala decreased in summer while that caused by Puccinia sp. increased in summer and reached the maximum level in October. The temperature suitable for germination and germ tube growth of the uredospores of both fungi ranged between 22-28°C.
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Kazuo HOKAMA, Isuke TOKASHIKI
1987 Volume 33 Pages
39-41
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Yield loss of cucurbitaceae and solanaceae vegetables caused by tomato spotted wilt virus is severe in Okinawa prefecture. It was observed that the loss affects cucumber infected with TSWV after inoculation at the cotyledon stage. Plants infected with the virus were shorter and the length and number of lateral shoots were lower than in the non-inoculated healthy plants. Yield of infected plants was about 40 percent lower than that of the non-inoculated plants.
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Soichi SAKAGUCHI, Katsumi KATAYAMA
1987 Volume 33 Pages
42-44
Published: October 30, 1987
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Junichirou YAMAGUCHI, Jyoichi URATA, Masamichi KAN
1987 Volume 33 Pages
45-47
Published: October 30, 1987
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Yasuo SONKU, Yoshikuni NOMURA
1987 Volume 33 Pages
48-52
Published: October 30, 1987
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Kenzoh KOBAYASHI, Kiyoshi HARUTA, Masahiro YOSHIDA
1987 Volume 33 Pages
53-56
Published: October 30, 1987
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Yasuhiro NISHIZAKI, Tsuruo KAYAMURA, Takashi ISHIJIMA
1987 Volume 33 Pages
57-61
Published: October 30, 1987
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Yoshikuni NOMURA, Yasuo SONKU
1987 Volume 33 Pages
62-65
Published: October 30, 1987
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Kinji TANAKA, Seiji TSUCHIDA, Fukuji NONAKA
1987 Volume 33 Pages
66-70
Published: October 30, 1987
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Severe occurrence of asparagus stem blight caused by Phoma asparagi Sacc. was observed from mid-September to mid-October after a typhoon in 1986. The fungus isolated from the lesions was pathogenic to asparagus based on pre-emergence inoculation tests. On the basis of the symptoms observed on the infected plants and shape of the pycnospore formed in the pycnidium, the pathogen of stem blight was identified as Phoma asparagi Sacc. The optimum temperature for mycelial growth of the fungus on potato sucrose agar was 24-25 C. Agar media with potato and asparagus sucrose were suitable for the formation of large pycnidia.
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Masafumi MATSUZAKI, Kazuma HYAKUTAKE, Kazuhiro OGATA, Jun-ichirou YAMA ...
1987 Volume 33 Pages
71-72
Published: October 30, 1987
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Hiroshi IKEDA
1987 Volume 33 Pages
73-75
Published: October 30, 1987
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Mitsuo SADAMATSU, Hideki MIKURIYA, Nobuya TASHIRO
1987 Volume 33 Pages
76-78
Published: October 30, 1987
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Norimitsu SAKAGUCHI, Masateru NAGAHAMA, Tamotsu KIKU
1987 Volume 33 Pages
79-83
Published: October 30, 1987
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Akira MORITA, Michiaki NAGANO
1987 Volume 33 Pages
84-87
Published: October 30, 1987
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Tamotsu KIKU, Norimitsu SAKAGUCHI
1987 Volume 33 Pages
88-90
Published: October 30, 1987
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Takaharu ISODA, Michio UEMURA
1987 Volume 33 Pages
91-93
Published: October 30, 1987
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Yosio OGAWA
1987 Volume 33 Pages
94-97
Published: October 30, 1987
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3. Activity of adults in early planted paddy fields
Akira TANAKA
1987 Volume 33 Pages
98-101
Published: October 30, 1987
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Behavior of adults of L. oryzophilus and their migration from overwintering sites to early planted paddy fields and vice versa was observed from 1985 to 1987 in Kagoshima Prefecture, and the following ecological characteristics of the weevil were noted. Adults derived from the larvae which developed in early planted paddy fields appeared from mid-June to July, feeding on ineffective tillers and other gramineous weeds which grew on ridges. In July they flew to waste lands of Imperata cvlindrica, hedges and elsewhere around the paddy fields, where they buried into soil, and overwintered until the following February. Overwintered adults appeared from early to mid-March, feeding on new leaves of I. cylindrica. The number of adults reached a peak in early April. Thereafter they flew to early planted paddy fields from the overwintering sites from mid-April to early May soon after the start of transplanting.
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Hirotsugu KIYOTA, Kunihide OKUHARA
1987 Volume 33 Pages
102-105
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Yoshio MIYAHARA, Yoshio HIRAI, Shingo OYA
1987 Volume 33 Pages
106-109
Published: October 30, 1987
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Moriyoshi KANESHIMA, Syouji YAMAUCHI, Taiji KUROZUMI
1987 Volume 33 Pages
110-112
Published: October 30, 1987
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Hidemi KAMIWADA, Kohjin NAKAGAWA, Masahiro KOBAYASHI
1987 Volume 33 Pages
113-115
Published: October 30, 1987
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Toshio SUENAGA, Osamu SETOKUCHI, Kiyokazu SAKAE
1987 Volume 33 Pages
116-118
Published: October 30, 1987
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The infestation of sweet potato with the sweet potato weevil, Cylas formicarius FASRICIUS and small sweet potato weevil, Euscepes postfasciatus FAIRMAIRE was investigated at 85 sites in the Amami Islands in late autumn of 1985 and 1986. The average rates of damage of the stems and tuberous roots of sweet potato amounted to 49.2% and 15.2%, respectively. E. postfasciatus was distributed in the town of Wadomari in Okierabu Island, Tokunoshima Island, and Amamiooshima Island. Both weevils were distributed in the town of Wadomari town of the Okierabu Island. In Yoron Island, the presence of species of these weevils has not been confirmed.
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Hidehiko WAKIBE, Osamu HIGASHIZIMA, Sakuro ONITUKA
1987 Volume 33 Pages
119-121
Published: October 30, 1987
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Nobuyoshi ISHIBASHI, Hiroyuki KUBO
1987 Volume 33 Pages
122-125
Published: October 30, 1987
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Cinnamic aldehyde exhibited a remarkable nematicidal activity against infective juveniles of Meloidogyne incognita. LC
50 was 10ppm for 24 hr in water following 24 hr immersion in the solution at 25°C . The empirical formula was Y=-0.7808+5.6788X, where Y was the probit of mortality and X was the log dosage (ppm). When the dose exceeded 30ppm for 24hr no larvae survived. However a larger dose was required for the soil application, ca. 2g per 10
l soil to reduce the damage caused by root-knot nematodes. On the other hand, the number of free-living nematodes, especially rhabditid nematodes, increased conspicuously soon after soil application of the chemical at the rate of 1-2g/10
l. This chemical is recommended as a soil fumigant for small areas, as it is highly volatile.
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Kazutoshi NAKASONO, Zen-ichi SANO, Masaaki ARAKI
1987 Volume 33 Pages
126-130
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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About fifty percent or more of Pratylenchus coffeae, Meloidogyne sp. L2 and saprophagous nematodes which emerged out of an Ando soil (fine textured) remained on the wall of an ordinary Baermann funnel after 48 hr of extraction and 18 hr of sedimentation. A Baermann funnel with a wall 60°in inclination enabled to recover maximum numbers of Meloidogyne incognita L2 on the funnel stem as compared with inclinations of 30°, 45°, 75°, and 80°when the nematodes were extracted from naturally infested Ando soil or when a thin layer of fine soil sediment was placed on the funnel wall before inoculation of M. incognita L2 onto the filter consisting of a sheet of Japanese paper. The efficiency of extraction increased exponentially with the increase of the inclination when the nematodes were extracted using a clean funnel without any soil debris. The total percentages of extraction (% on the wall plus stem) were similar regardless of the inclination (84-90%). The rate of nematode passage through the filter was adversely affected by the presence of fine sediments of different soil types; i.e. Ando soil, redyellow soil and alluvial soil (fine-textured soil) which gave total recoveries of 63, 45, and 38%, respectively 120 hr after inoculation. In contrast the passage in the control without any sediment was very rapid and a final recovery of 90% was achieved. Inhibition of the passage by 3.5g sand on the filter was negligible (81% passage).
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Masatoshi HORIKIRI, Susumu MAKINO
1987 Volume 33 Pages
131-135
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Susceptibility to a mixture of fenvalerate and malathion was tested by using the leaf dipping method for the diamondback moth, Plutella xylostella, collected from 17 different localities in Kagoshima Prefecture. The field-population in Mizobe has been noted to exhibit a high resistance level since 1984. This tendency was reconfirmed in 1986 and 1987. The resistance level had also increased in some of the populations examined. In the Mizobe population, the resistance level fluctuated seasonally, being relatively lower in spring and higher in summer and autumn. In addition the susceptibility to several other insecticides, except cartap, also decreased in the Mizobe population. Field experiments showed that mixtures of Bacillus thuringiensis and fenthoate or prothiofos were effective in controlling the Mizobe population. Soil treatment by benfuracarb at the time of transplant was highly effective against the Ibusuki population.
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Hideo UEMATSU, Tsutomu YAMASHITA, Akira SAKANOSHITA
1987 Volume 33 Pages
136-138
Published: October 30, 1987
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The diamondback moth, Plutella xylostella L. is the most serious insect pest of cruciferous crops such as cabbage, broccoli and radish in Miyazaki. Larvae and pupae of P. xylosiella were collected to examine their natural enemies in 1985 and 1986. The ichneumonid Diadromus collaris, the braconid Apanteles plutellae and the eulophid Tetrastichus sokolowskii were dominant parasitoids. Four other parasitic wasps were also observed, but they accounted for only 2% of all the parasitoids. D. collaris appeared from April to October, and a percentage parasitism of 50 to 60% was recorded in the samples collected in June and July. A. plutellae emerged throughout the season and the percentage parasitism of this wasp ranged from 20 to 60% in samples collected during June to November. Although the percentage parasitism of T. sokolowskii was rather low in spring to early summer values of 50 to 80% were recorded in the samples collected in
autumn.
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Akira SAKANOSHITA, Masato OHTA, Hideo UEMATSU
1987 Volume 33 Pages
139-141
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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The Authors compared the ovarian conditions of three species, Apanteles plutellae, Diadromus collaris and Tetrastichus sokolowskii which were dominant parasitoids of P. xylostella in Miyazaki. They were reared on honey and water in the absence of the hosts, and the reproductive organs were examined. Ovaries of A. plutellae are composed of two pairs of ovarioles. Twenty to forty ripe eggs were counted in the ovaries of the wasp within 24 hours after emergence. The maximum number of the ripe eggs, 90-130, was observed in the wasps on the sixth day of adulthood. Afterwards, the conditions of the ovaries remained more or less constant. Ovaries of T. sokolowskii were usually composed of 12 or 14 ovarioles. Ten to twenty ripe eggs were observed in the wasps within 24 hours after emergence. The number of ripe eggs increased until the fourth day of adulthood, and 30 to 60 eggs were stored in the ovaries. Afterwards, the conditions remained unchanged. Ovaries of D. collaris were composed of six ovarioles. Newly emerged females had no ripe eggs in their ovaries. The maximum number of the eggs, 5-12, was observed in the wasps on the second day of the adulthood. Ovisorption began from the 6th day and continued indefinitely. No eggs were observed in the females reared for 20 days after emergence.
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Akira KAWAI, Chikayoshi KITAMURA
1987 Volume 33 Pages
142-144
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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The flight activity of the diamondback moth was recorded during several days after emergence using an electric actogram. The percentage of active moths was low in both males and females, and the flight activity of the diamondback moth was low, although a few moths were very active. Flight activity was higher in the dark period than in the light period. It was low on the days of emergence, and became maximum on the following day without adult food or several days after emergence when adult food was available.
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4. Evaluation of the effectiveness of a trap baited with synthetic sex pheromones
Masatoshi HORIKIRI, Susumu MAKINO, Toshio SUENAGA, Chikayoshi KITAMURA
1987 Volume 33 Pages
145-146
Published: October 30, 1987
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Hideo UEMATSU
1987 Volume 33 Pages
147-149
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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The hibiscus caterpillar is a serious pest of okra, Hibiscus osculentus and H. mutabilis in Miyazaki. As the young larvae are green they cannot be distinguished easily from the surrounding palnts. The last instar larvae show a warning coloration composed of green, yellow, black and red patterns. The 1st and 2nd instar larvae prefer the back of the leaves. The 3rd and 4th instar larvae utilize the surface of the leaves as feeding site, although they molt in the back of the leaves. The 5th and last instar larvae re-main on the surface of the leaves throughout their life. There were no direct rela-tionships between the habitat preference and caterpillar's coloration except that larvae with a warning coloration always remained on the surface of the leaves.
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Toshikatsu NISHINO
1987 Volume 33 Pages
150-153
Published: October 30, 1987
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Hiroshi SUZUKI, Sinichi MIYAGI
1987 Volume 33 Pages
154-158
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Riyosuke SATO, Fujio NAGAI, Yoshitoki FUJIKI, Hideo SAITA
1987 Volume 33 Pages
159-160
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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Koji YASUDA, Keiji YASUDA, Masaichi TSURUMACHI
1987 Volume 33 Pages
161-163
Published: October 30, 1987
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I. Changes in the amount of eggs laid and the longevity of mass-reared adults
Takahiro KAMIKADO, Naoya CHISHAKI, Hidemi KAMIWADA, Akira TANAKA
1987 Volume 33 Pages
164-166
Published: October 30, 1987
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The weekly amount of eggs laid and the adult longevity were investigated in a stock of the melon fly, Dacus cucurbitae COQUILLETT, which had been mass-reared for about 54 generations since 1981. After the onset of mass rearing, the average amount of eggs laid gradually increased to 75ml/week/cage by the 14th generation, and reached a plateau thereafter. In the process of generations, the peak of oviposition came earlier and the longevity became shorter. However the total amount of eggs laid during the whole life span of the females was not reduced.
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I. Seasonal change in the abundance of attracted land mollusks by metaldehyde
Taiji KUROZUMI, Hiroshi SUZUKI
1987 Volume 33 Pages
167-173
Published: October 30, 1987
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Hatsuko MIKURIYA, Junichirou YAMAGUCHI
1987 Volume 33 Pages
174-178
Published: October 30, 1987
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Keiji YASUDA
1987 Volume 33 Pages
179-180
Published: October 30, 1987
Released on J-STAGE: May 22, 2009
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