著者

片桐 麦 佐藤 良太 大池 正信 鈴木 芳人 鹿野 満 内田 龍男

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告. EID, 電子ディスプレイ (ISSN:09135685)

巻号頁・発行日

vol.109, no.146, pp.1-4, 2009-07-16

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スクリーン下側からのプロジェクタ光のみを観察者の存在する正面方向に拡散させるスクリーンを考案した。これにより明るい環境下における高いコントラスト比を有するフロントプロジェクションディスプレイを実現した。

著者

内田 一秀 後藤 千枝 務川 重之 光永 貴之 鈴木 芳人

出版者

日本応用動物昆虫学会

雑誌

日本応用動物昆虫学会誌 (ISSN:00214914)

巻号頁・発行日

vol.53, no.4, pp.157-164, 2009-11-25 (Released:2009-12-16)

参考文献数

27

被引用文献数

1

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The relationship between larval instar and head-capsule width in Helicoverpa armigera (Hübner) was examined in laboratory-reared and field-collected insects from Ibaraki and Yamanashi in eastern Japan. Each of the first three and each of the last three instars could reliably be distinguished using head-capsule width for both strains fed on an artificial diet. In the laboratory, 91.8% of larvae from Ibaraki had five instars, and 8.2% had six or seven instars, while 36.1% of the larvae from Yamanashi had five instars, and the rest had six instars. Pupation occurred when the larval head-capsule width reached about 2.6 mm, and the development time for each instar was independent of the total number of instars. Consequently, head-capsules were typically larger at each instar for larvae with fewer instars. The distribution of head-capsule widths in larvae obtained from sunflowers in Ibaraki showed peaks corresponding to the first, penultimate, and ultimate instars of laboratory-reared larvae. However, the widths supposedly representing the second and third instars were smaller than those found in the laboratory, suggesting that H. armigera larvae molt more times in the field than in the laboratory and require a longer time to complete development on sunflowers. These results may enable improvement of H. armigera forecasting and insecticide bioassay tests.