著者
筒 井等 早川 博文 後藤 千枝 石田 茂樹 伊吹 俊彦
出版者
The Society of Plant Protection of North Japan
雑誌
北日本病害虫研究会報 (ISSN:0368623X)
巻号頁・発行日
vol.1988, no.39, pp.199-202, 1988

ラジコンヘリによる微量散布での防除効果を評価するため, ジャガイモヒゲナガアブラムシを対象として防除試験を行った。ジメトエート・フェンバレレート乳剤の微量散布は, 圃場中央畦では慣行散布と同等の防除効果であった。農薬散布後, バレイショ葉を採取してジャガイモヒゲナガアブラムシを接種した結果, ラジコンヘリ飛行直下畦のジャガイモ葉ではト, 中, 下位葉とも100%の死亡率で, 慣行散布より防除効果が高かった。しかし, 飛行直下より離れた畦では生残虫が見られた。農薬の付着程度と死亡率との関係では'供試したジメトエート・フェンバレレート乳剤とチオメトン乳剤とも, 5.6粒/cm2以上で死亡率10O%であった。
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

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.