巻号一覧
49 巻 (2005)
- 4 号 p. 171-
- 3 号 p. 99-
- 2 号 p. 51-
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49 巻, 3 号
選択された号の論文の10件中1～10を表示しています
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原著
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田渕 研, 守屋 成一, 水谷 信夫2005 年 49 巻 3 号 p. 99-104
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーSeasonal catches of the bean bug, Riptortus clavatus (Thunberg), in water-pan traps with synthetic attractants were compared with the seasonal prevalence of this insect estimated by direct counting in soybean fields in 2002 and 2003. Eight traps were set at various locations to evaluate the effect of the environment of trap location on the number of catches. In the soybean fields, the peak incidence of this insect occurred in early September when the soybean pods began to enlarge. In contrast, the number of catches in traps reached a peak one month after the peak incidence in the soybean field. These results demonstrate that the number of trap catches does not reflect bean bug incidence in soybean fields. The number of trap catches at eight locations differed largely, and the factors that affected the number of bugs trapped remained unclear. To achieve the practical use of synthetic attractants for monitoring the population of this insect, further studies are needed to gain information that links the density of this insect in soybean fields and the number of catches per trap.抄録全体を表示PDF形式でダウンロード (588K) -
佐藤 雅, 中島 隆, 菅野 紘男2005 年 49 巻 3 号 p. 105-111
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーThe incidence of rice blast disease caused by Magnaporthe grisea in rice plants infested with the white-backed planthopper, Sogatella furcifera, was studied under field conditions. Pesticides, fipronil or imidacloprid were used to control the occurrence of S. furcifera in paddy fields. A comparison was made for the incidence of rice blast in paddy fields treated and not treated with pesticides. The results showed that the development of blast lesions was higher on rice plants in paddy fields where fipronil or imidacloprid was applied as compared to those plants in paddy fields where the pesticides were not applied. Moreover, the number of blast lesions was significantly smaller on rice plants that had previously been exposed to infestation with S. furcifera as compared to plants that had not been infested. These results show that infestation with S. furcifera induced disease resistance in the rice plants, thereby reducing their susceptibility to M. grisea.抄録全体を表示PDF形式でダウンロード (301K) -
樋口 博也, 高橋 明彦2005 年 49 巻 3 号 p. 113-118
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーSeasonal changes in egg diapause induction and the effects of photoperiod and temperature on egg diapause in the rice leaf bug, Trigonotylus caelestialium (Kirkaldy), were examined using a population in Joetsu, Niigata Prefecture. The bugs were reared from egg to adult at five temperatures, ranging from 22 to 34°C, combined with eight photoperiods, ranging from 9L–15D to 16L–8D. The critical photoperiod for egg diapause induction fell between 13L–11D and 14L–10D at 25°C. However, the females reared at 28, 31 and 34°C deposited a large proportion of non-diapause eggs even if the photophase was shorter than 14 h. When the females laying diapause eggs were transferred to 11L–13D at 31°C, the number of females laying non-diapause eggs increased gradually on and after five days. Therefore, it is concluded that the females reared at a high temperature from the egg stage produce non-diapause eggs regardless of the photoperiod, and that a high temperature at the adult stage causes females laying diapause eggs to deposit non-diapause eggs. Seasonal changes in the proportion of diapause eggs produced by females collected in the fields were examined for three years, from 1999 to 2001. In 1999 and 2001, the percentage of diapause eggs increased gradually in September. However, the percentage of diapause eggs produced by the females collected on 20 September, 2000, decreased to less than 10%. It is considered that this phenomenon was caused by high temperatures for 4 days in the previous week.抄録全体を表示PDF形式でダウンロード (297K) -
津田 勝男, 山下 紘平, 坂巻 祥孝, 櫛下町 鉦敏, 青木 智佐, 飯山 和弘, 岡田 斉夫, 河原畑 勇2005 年 49 巻 3 号 p. 119-122
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーPolyhedral inclusion bodies (PIB's) of seven isolates of nucleopolyhedrovirus (NPV) (Spodoptera litura NPV Fukuyama, S. littoralis NPV Egypt, Mamestra brassicae NPV Geihoku, M. brassicae NPV Tokyo, Xestia c-nigrum NPV Nasu, Mythimna separata NPV Geihoku, and M. loreyi NPV Fukuyama) that have been known to infect the tobacco cutworm, S. litura, were stored as water suspensions at 4–6°C for more than 20 yr after preparation in cold storage. The virulence of PIBs was detected successfully from six NPV isolates, excluding M. loreyi NPV Fukuyama. PIBs of re-isolated viruses prepared from newly infected S. litura larvae were further used to estimate the initial infectivity of the stored PIBs. PIBs of S. litura NPV Fukuyama and S. littoralis NPV Egypt were relatively resistant to long-term storage and the infectivity decreased to 1/50 after 24-yr storage in distilled water. M. brassicae NPVs seemed highly sensitive to long-term storage under the conditions of the present study.抄録全体を表示PDF形式でダウンロード (198K) -
宮島 淳二, 草野 僚一2005 年 49 巻 3 号 p. 123-127
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーIn order to establish control measures against the cypress bark moth Epinotia granitalis Butler, we surveyed the inter-tree variation of the Japanese cedar Cryptomeria japonica D. Don in Kumamoto Prefecture for degree of infestation by examining the spatial distribution pattern of feeding scars made by larvae of the moth. The trees surveyed proved to be mono-clone by DNA analysis with RAPD markers. The spatial distribution pattern of feeding scars indicated that the infestation was not strongly concentrated to certain trees in any year, and remarkable infestation occurred almost evenly among the trees throughout the past 25 years. Thus, inter-tree variation in the degree of infestation by E. granitalis was not detected in the mono-clone stand of C. japonica. The results suggest that in Kyushu district, where most C. japonica plantations consist of mono-clonal trees, we must treat all of the trees in a stand, not only the markedly infested trees, in order to control E. granitalis.抄録全体を表示PDF形式でダウンロード (331K) -
津田 勝男, 甲斐 絢子, 坂巻 祥孝, 神㟢 保成, 櫛下町 鉦敏2005 年 49 巻 3 号 p. 129-133
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーThe sensitivity of the larvae of two tea tortricids, Adoxophyes dubia and A. honmai, to Adoxophyes orana granulovirus was compared by peroral inoculation of granular inclusion bodies. A. dubia and A. honmai used in this study originated from feral moths collected in southern Kyushu, and were maintained as laboratory stocks. Although the larvae of the two species showed similar sensitivity to A. orana granulovirus during early to middle larval stages, extension of the larval period caused by the granulovirus was more evident in A. dubia than in A. honmai.抄録全体を表示PDF形式でダウンロード (242K) -
徳丸 晋, 阿部 芳久2005 年 49 巻 3 号 p. 135-142
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーThe immature developmental period and adult emergence rate of Liriomyza sativae, L. trifolii, and L. bryoniae on 16 plant species were examined. Kidney bean (developmental period: 16.5 d), eggplant (16.4 d), and garland chrysanthemum (16.9 d) were more suitable for L. sativae than other plants; kidney bean (16.5 d), soybean (16.4 d), tomato (16.7 d), eggplant (16.2 d), mizuna (16.2 d), mibuna (17.0 d), okra (17.4 d), and garland chrysanthemum (16.3 d) were more suitable for L. trifolii than other plants; soybean (19.0 d), pumpkin (19.3 d), tomato (19.2 d), eggplant (18.3 d), komatsuna (18.9 d), mizuna (18.3 d), mibuna (19.1 d), okra (18.4 d), garland chrysanthemum (18.9 d), and welsh onion (18.0 d) were more suitable for L. bryoniae than other plants. The adult emergence rates on okra and garland chrysanthemum for L. sativae, that on komatsuna and melon for L. trifolii, and that on welsh onion and komatsuna for L. bryoniae were high. In the choice oviposition experiments with kidney bean, cucumber, eggplants, and komatsuna, L. sativae preferably oviposited into the kidney bean, and there was no host oviposited prominently by the L. trifolii or L. bryoniae females. In the choice oviposition experiments with kidney bean, cucumber and tomato, there was no significant difference in the number of eggs laid by each Liriomyza species among the three hosts.抄録全体を表示PDF形式でダウンロード (230K)
短報
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石島 力, 今村 太郎, Porntip Visarathanonth, 宮ノ下 明大2005 年 49 巻 3 号 p. 143-145
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーThe impact of two predatory bugs, Xylocoris flavipes and Joppeicus paradoxus, on the stored-product insect, Tribolium confusum, was examined. Five pairs of adult T. confusum were placed in a plastic container (dia. 15 cm, height 8 cm) containing 10 g of whole-wheat flour. After 3 d, the following four experimental groups were set up: Control (no predator release), X. flavipes (four pairs of adult X. flavipes released), J. paradoxus (four pairs of adult J. paradoxus released), and X. flavipes+J. paradoxus (two pairs each of X. flavipes and J. paradoxus released). Twenty-five days after the release of the predatory insects, we counted the number of living T. confusum, X. flavipes, and J. paradoxus. The number of T. confusum in the X. flavipes-treated and J. paradoxus-treated groups was 3 and 33% of the control, respectively. On the other hand, the suppressive effect of X. flavipes+J. paradoxus treatment was lower than that of the above two treatments, probably due to intraguild predation between X. flavipes and J. paradoxus.抄録全体を表示PDF形式でダウンロード (180K) -
安田 慶次, 河村 太, 大石 毅2005 年 49 巻 3 号 p. 146-149
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーThe location and preference of adult Asian citrus psyllid, Diaphorina citri Kuwayama, a vector of the citrus huanglongbing (greening disease) Liberobacter asiaticum, on two host plants, Murraya exotica L. and Citrus depressa Hayata, were investigated in Okinawa Prefecture, Japan. While the adults of D. citri were found on all parts of the C. depressa tree and on the M. exotica tree, all of the D. citri eggs and most of the nymphs and adults were found on young shoots and young leaves. We suggest that it is possible to save labor in the investigation and control of the psyllid by attentively checking the young shoots of M. exotica. Investigation on the distribution of D. citri adults on M. exotica plantlets hung upside down in a container showed that although no difference was found between frequencies of males on young leaves and mature leaves, significantly more females were found on the apical buds, suggesting that females have a preference for this part of the tree.抄録全体を表示PDF形式でダウンロード (866K) -
諸富 勝成, 村上 香, 長島 孝行, 大森 彬, 一ノ瀬 幸代2005 年 49 巻 3 号 p. 150-153
発行日: 2005年
公開日: 2005/11/25
ジャーナル フリーPDF形式でダウンロード (961K)
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