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Mabito IWASAKI, Masaaki NAKANO, Akira SHINKAI
1984 Volume 30 Pages
1-2
Published: October 30, 1984
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Shizuo MOGI, Seiya TSUSHIMA, Hatsuo SAITO
1984 Volume 30 Pages
3-5
Published: October 30, 1984
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Tomio TAKASAKI, Daizaburo YOSHIMURA, Mari OTOFUJI
1984 Volume 30 Pages
5-8
Published: October 30, 1984
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Shizuo MOGI, Hideki NAITO, Seiya TSUSHIMA, Hatsuo SAITO
1984 Volume 30 Pages
8-11
Published: October 30, 1984
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In 1982, about 550 mono-spore cultures of the rice blast fungus, Pyricularia oryzae, were obtained from 165 varieties isolated in the Kyushu district including the surrounding islands. They were inoculated to 9 differential varieties and to Reiho, Nishi-homare and Mohkoto for reference. Out of them, 15 pathogenic races were identified. Seven races were considered to be the major races in Kyushu, as follows : race 003 (frequency of isolation : 41%), race 001 (25%), race 002 (9%), race 102 (7%), race 007 (6%), race 033 (5%) and new race 000 (3%). Races 001, 003, 007 and 033 were prevalent in Okinawa, Yoronshima, Okinoerabushima, Amamioshima, Yakushima, Tanegashima, Ikishima, Tsushima and Goto islands, while races 003, 001, 002 and 102 were mainly distributed, in the Kyushu district. A new race 000 was identified in 1982 from Oita and Miyazaki Prefectures on varieties Kuju and K oshihikari, which are resistant to race 102. The frequency of isolation of races 001, 002 and 000 was increased compared to 1977, while that of races 102, 033 and 007 was decreased.
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Mari OTOFUJI, Daizaburo YOSHIMURA, Tomio TAKASAKI
1984 Volume 30 Pages
11-14
Published: October 30, 1984
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Shingo ORITA, Takao TOMIO, Hiroshi HIROTANI
1984 Volume 30 Pages
15-17
Published: October 30, 1984
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Soichi SAKAGUCHI
1984 Volume 30 Pages
17-21
Published: October 30, 1984
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Katsumi KATAYAMA, Sadao KIMURA, Toshinori SHINSU
1984 Volume 30 Pages
21-24
Published: October 30, 1984
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For the control of bacterial wilt of potato in the fall cropping caused by Pseudomonas solanacearum, chloropicrin injection treatment into soil at the rate of 30l/10a followed by covering with polyethylene film over the whole treated area of the field was found to be more effective than dazomet at 30kg/10a and chloropicrin at 10l/10a or 20l/10a with polyethy-lene-covering. And the effect of chloropicrin 10l/10a or 20l/10a with polyethylene-covering was as well as that of chloropicrin 30l/10a without polyethylene-covering. Solarization, namely heating the field soil by mulching with a transparent polyethylene film over the soil sur-face in the summer season gave good control in two experiment fields out of the five fields tested. The biovar II strain of P. solanacearum was detected only in the fields where the control was not effective. But only the biovar IV strain was isolated in the fields where solarization was effective.
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Kouichi KITA, Kazuichi KUDO
1984 Volume 30 Pages
25-26
Published: October 30, 1984
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Nobuya TASHIRO, Yoshimitsu MATSUO
1984 Volume 30 Pages
27-29
Published: October 30, 1984
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Severe incidence of potato powdery scab caused by Spongospora subterranea (WALL.) LAGERHEIM was observed in a potato plantation in the Uwaba district of Saga Prefecture in the spring of 1983. Occurrence of the disease was limited to the fields treated with chloropicrin, especially in the areas where fields were treated with chloropicrin and subsequently covered with vinyl plastic film, while the incidence of the disease was mild in the untreated areas. As for the climatic factors, in the season with incidence of the disease, precipitation was abundant during the early and middle stages of potato tuber elongation. Therefore, severe incidence of the disease seems to be due to the preferential multiplication of the causal fungus introduced into the fields by the plantation of infested potato tubers as a primary inoculum along with the simplification of the soil microflora caused by the treatment with chloropicrin and weather conditions favorable for the multiplication of the pathogen.
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Masaaki NAKANO, Mabito IWASAKI, Akira SHINKAI
1984 Volume 30 Pages
30-32
Published: October 30, 1984
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Ryuutaro NAGATA
1984 Volume 30 Pages
33-35
Published: October 30, 1984
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Masamichi KAN, Hiroaki YOKHO, Masafumi MATSUZAKI
1984 Volume 30 Pages
36-38
Published: October 30, 1984
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Kazuo HOKAMA
1984 Volume 30 Pages
38-40
Published: October 30, 1984
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Shunji SATO, Tsutomu TOMIKU, Wataru HASAMA, Yasuyuki ETO
1984 Volume 30 Pages
41-42
Published: October 30, 1984
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Yoshikuni NOMURA, Akira KISO, Yasuo SONKU
1984 Volume 30 Pages
43-45
Published: October 30, 1984
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Sumito TANAKA, Hiroshi IKEDA, Toshinobu NAKAMURA
1984 Volume 30 Pages
45-47
Published: October 30, 1984
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Hidehiko WAKIBE, Kazuo MIYAHARA
1984 Volume 30 Pages
48-51
Published: October 30, 1984
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The two-spotted leafhopper, Macrosteles orientalis VIRBASTE, was allowed to feed for 3-4 days on 7 species of plants collected in fields and showing MLO-like symptoms caused by MLOs. The leafhopper was subsequently transferred to healthy test seedlings of garland chrysanthemum for inoculation access. All test seedlings showed conspicuous yellowing symptoms within 2 months after inoculation. Isolates originating from wavy bittercress, Japanese honewort, sow-thistle, white clover and lettuce were maintained on garland chrysanthemum. In inoculation tests to 6 species of test plants using all isolates, garland chrysanthemum, lettuce, Japanese honewort and onion showed MLO-like symptoms. Symptoms on Mexican ageratum appeared only after the inoculation of an isolate from diseased wavy bittercress and also symptoms on tomato were recognized after the inoculation of an isolate from diseased Japanese honewort.
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Hiroshi IKEDA, Sumito TANAKA, Toshinobu NAKAMURA
1984 Volume 30 Pages
51-54
Published: October 30, 1984
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Masafumi MATSUZAKI, Masamiti KAN
1984 Volume 30 Pages
55-58
Published: October 30, 1984
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Fungicides effective in the control of Phytophthora rot of strawberry caused by Phytophthora nicotianae var. parasitica were examined by applying screening tests in vitro and in vivo. Of the 39 fungicides tested, captatol (WP), captan (WP), CG-127 (WP), etridiazole (EC) and CG-117 (G) were found to be effective based on tests using the dip method of mycelial agar disks and direct spray on the plant. For the treatment of infested soil in greenhouse and field, captatol, CG-127 and etridiazole were the most effective fungicides.
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Toshinori SHINSU, Masaaki KOBAYASHI
1984 Volume 30 Pages
59-61
Published: October 30, 1984
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Mitsuo SADAMATSU, Hideki MIKURIYA
1984 Volume 30 Pages
61-64
Published: October 30, 1984
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Akira MORITA
1984 Volume 30 Pages
64-68
Published: October 30, 1984
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Tamotsu KIKU, Norimitsu SAKAGUCHI
1984 Volume 30 Pages
68-70
Published: October 30, 1984
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Norimitsu SAKAGUCHI, Masateru NAGAHAMA
1984 Volume 30 Pages
70-73
Published: October 30, 1984
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Toshiyuki NONAKA
1984 Volume 30 Pages
73-76
Published: October 30, 1984
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Minoru MURAOKA, Mitsuo SADAMATSU, Hideki MIKURIYA
1984 Volume 30 Pages
76-78
Published: October 30, 1984
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Yasuo SONKU
1984 Volume 30 Pages
79-82
Published: October 30, 1984
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Nozomu FUJIYOSHI, Masahiro YAMANAKA, Tomio TAKASAKI
1984 Volume 30 Pages
82-85
Published: October 30, 1984
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Kyoko IWANAGA, Sumio TOJO, Toru NAGATA
1984 Volume 30 Pages
85-89
Published: October 30, 1984
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Kazuaki SHIMADA
1984 Volume 30 Pages
89-91
Published: October 30, 1984
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Hatsuko MIKURIYA, Kazuo MIYAHARA
1984 Volume 30 Pages
91-95
Published: October 30, 1984
Released on J-STAGE: December 09, 2009
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Keiji YASUDA
1984 Volume 30 Pages
96-99
Published: October 30, 1984
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Sumio TOJO, Masayuki MORITA
1984 Volume 30 Pages
99-101
Published: October 30, 1984
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Masayuki MORITA, Sumio TOJO
1984 Volume 30 Pages
102-104
Published: October 30, 1984
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Masahiro KOBAYASHI, Kensuke OASHI, Osamu SETOKUCHI
1984 Volume 30 Pages
105-108
Published: October 30, 1984
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Adult behavior of the chafer, A nom ala rufocuprea, was studied in a soybean field at the station fields of Osumi Branch, Kagoshima Agric. Expt. Stn. in 1982 and 1983. The results indicated that the adults showed a daily periodicity in their feeding behavior, premating behavior with males grasping females by their fore legs, and mating behavior. Adults fed on the leaves actively immediately after sunrise and again from around 9:00 p. m. to 3:00 a. m. Premating behavior was usually observed around 3:00 p. m., and 35 of 36 pairs were found to be mating between 5:00 p. m. and 7:00 p. m. The time at which females moved into the soil for oviposition could not be estimated by recording the sex ratio or proportion of the number of adults on the plants and under the ground.
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Takao TOMIO, Shingo ORITA
1984 Volume 30 Pages
109-112
Published: October 30, 1984
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Toshikatsu NISHINO, Toshinori SHINSU, Soichi SAKAGUCHI
1984 Volume 30 Pages
112-115
Published: October 30, 1984
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Zen-ichi SANO, Kazutoshi NAKASONO, Masaaki ARAKI
1984 Volume 30 Pages
115-119
Published: October 30, 1984
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Egg and larval densities of M. incognita in field plots were investigated from August 1983 to March 1984 after the cultivation of a summer crop, cucumber, and a fall crop, carrot. The densities were determined by two combined extraction techniques, screening-centrifugal flotation and screening-bioassay. The results obtained by the two techniques were basically identical. In the summer-crop plots, a large number of second stage larvae (L-2) and few eggs were detected in early August, about one month after the death of all the cucumber plants due to heavy infestation with the nematodes. Density of the former declined sharply toward December. H owever, a large part of the remainders could survive until March. In the fall-crop plots, the densities of both eggs and L-2 were high in December immediately after the harvest of carrot, and no decrease was observed until March. These results suggest that in central Kyushu the nematode overwinters in the field soil mainly at the L-2 stage after summer-crop cultivation, while at both the L-2 and egg stages, after the cultivation of fall crops.
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Eizo KONDO, Nobuyoshi ISHIBASHI
1984 Volume 30 Pages
120-123
Published: October 30, 1984
Released on J-STAGE: May 22, 2009
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Growth and propagation of Steinernema feltiae (= Neoaplectana carpocapsae, DD-136) and S. glaseri were investigated at 3-day intervals for 18 days on the dog food media seeded or not seeded with the symbiotic bacteria I day before the inoculation with the surface-ster-ilized infective juveniles. Throughout the experimental period, the bacterial colonies were thicker on the media seeded with the bacteria than on those which had not been seeded. Irrespective of the inoculation with the bacteria, the rapid increase in nematode population began 6 days after nematode inoculation for S. glaseri and 9 days for S.feltiae. S.glaseri propagated on the seeded media much more actively than on the non-seeded ones, while a inhibitory effect on the propagation of S.feltiae was observed in the seeded media.
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Yoshihiro KITAUCHI, Takashi NOGAMI
1984 Volume 30 Pages
124-125
Published: October 30, 1984
Released on J-STAGE: May 22, 2009
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Kazutoshi NAKASONO, Masaichi TSURUMACHI, Rinko TERUYA
1984 Volume 30 Pages
126-128
Published: October 30, 1984
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Species of plant parasitic nematodes were identified in soil collected in fields of sugarcane and of the following vegetables grown on Okinawa, Miyako and Ishigaki islands : okura, Benincasa cerifera SAVI (togwa), cucumber, Momordica charantia L. (niga-uri), pumpkin, water melon, sweet potato, beans, taro, and eggplants. The following nematodes were commonly observed in association with most of the vegetables and sugarcane : Meloidogyne species including M. incognita and probably some more species, Pratylenchus coffeae, P. brachyurus, three unidentified Pratylenchus species, Helicotylenchus dihystera, Helicotylenchus sp., S cutellenema sp., Hoplolaimus sp., Tylenchorhynchus martini, T. nudus, two unidentified Tylenchorhynchus, Paratrophurus sp., and Rotylenchulus reniformis including each of the amphimictic and parthenogenetic populations. Vegetables-sugarcane rotational system which is recommended in subtropical croppings did not appear to be effective in terms of nematode control. Meloidogyne species was the most harmful one for vegetable cultivation in the area.
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6. Population growth and distribution on eggplant in the field and greenhouse
Chikayoshi KITAMURA, Akira KAWAI, Juro KOYAMA
1984 Volume 30 Pages
129-132
Published: October 30, 1984
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Toshio YOSHIHARA, Akira KAWAI, Takeo MASUDA, Shozo ENDO
1984 Volume 30 Pages
132-135
Published: October 30, 1984
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Hiroshi SUZUKI, Ansei MIYARA
1984 Volume 30 Pages
135-139
Published: October 30, 1984
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4. Methods for marking and transportation of sterilized pupae
Hidemi KAMIWADA, Akira TANAKA, Toshihiko NISHIOKA, Takahisa NAKAMURA
1984 Volume 30 Pages
140-143
Published: October 30, 1984
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To eradicate the melon fly, Dacus cucurbitae COQUILLETT, from Kikai Island by the sterile insect release method, procedures for marking and transportation of sterilized pupae were tested. The normal eclosion of adults was adversely affected by the shaking of pupae for 15 to 45 sec to mark them with a fluorescent dye. A volume of ten thousand pupae (Y) could be estimated by the number of pupae weighing 5g (X) based on the following equation, Y=-0.946X+605.652 (r=-0.8204). This equation enabled to determine the number of pupae per shipping envelope. The pupae marked with the fluorescent dye and packed in the shipping envelopes were loaded on a truck with a refrigerated container, and the truck was transported by a ferry boat from Naze to Kikai Island. The pupae were kept for about two days in the refrigerated container. By controlling the temperature of the container, the temperature inside the shipping envelope could be adjusted in the range of 20 and 30°C ; these conditions were considered to be favorable for the normal eclosion of the pupae.
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5. Method for releasing sterlie pupae
Toshihiko NISHIOKA, Akira TANAKA, Hidemi KAMIWADA, Takahisa NAKAMURA
1984 Volume 30 Pages
144-147
Published: October 30, 1984
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To eradicate the melon fly, Dacus cucurbitae COQUILLETT, from Kikai Island (55.7 km
2), release of the sterile flies was started on August 21, 1981. At least 4 million pupae have been released each week up to now. The pupae were placed in 420 buckets for release, and then the buckets were distributed at 210 points over the whole area of the island using a method similar to that adopted on Kume Island, Okinawa Pref. One or two weeks after the release, empty pupal skins and other residues were sampled from 20 points to estimate the rate of emergence from the buckets. The results of 101 release trials during two years up to August 19, 1983 showed that the emergence rate was strongly affected by the temperature. The rate became low both in the cool season (from December to February) and in the hot season (from July to August). Especially, in the coolest period when the mean temperature during four days after placing the pupae in buckets was below 15-16°C, the emergence rates were very low. Soon after the release was started, two problems were encountered one was that rain water leaked into the buckets and the other was that the teneral adults sometimes failed to creep out of the bucket. To overcome these problems, the bucket for release was modified in two ways. The under surface of the styrofoan lid of the bucket was pasted with a waterproof plastic sheet to prevent the leak of rain water, and the inner surface of the bucket was scraped with a wire brush so that the teneral adults could easily creep out.
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6. Comparison of flight ability between wild and massreared strains by suing a flight mill
Kohjin NAKAGAWA, Hidemi KAMIWADA, Akira TANAKA
1984 Volume 30 Pages
148-152
Published: October 30, 1984
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The flight ability of the melon fly, Dacus cucurbitae COQUILLETT, was compared between the wild (F1 generation) and mass-reared strains (about F11 generation) at 1, 3, 5, 10, 20, and 30 days after emergence. Males and females of the mass-reared strain flew over a shorter distance than those of the wild strain at the age of 20 and 30 days. During the 2-hr experiment, 30 days old females of the mass-reared strain flew during a shorter period of time than those of the wild strain. The females of the wild strain took less rest than those of the mass-reared strain in 20 and 30 days old individuals. The males and females of the mass-reared strain flew with a lower velocity than those of the wild strain with the increase of age. Thus, the flight ability of the mass-reared strain seemed to be inferior to that of the wild strain at the age of 20 and 30 days. This tendency may be due to the fact that mating occurs earlier in the mass-reared strain than in the wild strain because the mass-reared strain had been selected to mate earlier and to lay more eggs earlier and additionally its longevity became shorter than that of the wild strain.
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Michio OHBA, Keio AIZAWA, Shin-ichiro SUDO
1984 Volume 30 Pages
152-155
Published: October 30, 1984
Released on J-STAGE: May 22, 2009
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A total of 124 crystalliferous sporeformers were isolated from the silkworm litters of 8 sericultural farms out of 38 farms of Fukuoka Prefecture, Japan. Most isolates were found to belong to Bacillus thuringiensis serotypes 3a: 3b (subsp. kurstaki), 4a: 4b (subsp. sotto or subsp. dendrolimus), 4a: 4c (subsp. kenyae), 7 (subsp. aizawai), 8a: 8b (subsp. morrisoni), 9 (tolworthi), and 19 (subsp. tochigiensis). Of these 7 serotypes, serotypes 3a: 3b, 4a: 4c, and 7 were predominantly detected. No concentrated occurrence of this bacterium was observed in any particular region. Coexistence of two different serotypes was evident in 3 sericultural farms. Three H serotypes and one untypable strain were simultaneously isolated from one farm. Most isolates were toxic to the silkworm larvae, Bombyx mori. For mosquito larvae, Aedes aegypti, serotype 7 isolates were more toxic than the isolates of the other serotypes. The above untypable isolate was nonmotile and produced large parasporal inclusions nontoxic to larvae of the silkworm and the mosquito. The four isolates belonging to serotype 19 produced spherical parasporal inclusions. These isolates were nontoxic to the silkworm but showed low toxicity to the mosquito.
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Takafumi TSUTSUMI
1984 Volume 30 Pages
156-157
Published: October 30, 1984
Released on J-STAGE: May 22, 2009
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