サンゴジユケブカハムシの発生経過, 特に越冬卵のふ化時期について   :   Seasonal Development of Pyrrhalta humeralis (CHEN) (Coleoptera: Chrysomelidae), with Special References to the Hatching Time of Overwintering Eggs 

作成者 真梶, 徳純, 浜村, 徹三, 芦原, 亘
作成者 (ヨミ) ハマムラ, テツゾウ, アシハラ, ワタル
作成者の別表記 SHINKAJI, Norizumi, HAMAMURA, Tetsuzo, ASHIHARA, Wataru
日本十進分類法 (NDC) 620
内容 かんきつ園の防風樹や生垣に重用されているサンゴジュの害虫であるサンゴジュケブカハムシの発生経過を広島県安芸津町において1975年から1977年にわたって調査した.本種は冬を休眠した卵で越し, 3月中旬〜4月上旬にかけてふ化する.幼虫はサンゴジュの新葉を摂食しながら3齢を経過した後土中に入って5月中旬〜6月上旬に蛹化する.成虫は6月上旬〜7月上旬に羽化し, サンゴジュの成熟葉を摂食しながら夏を越すが, 産卵が始まるのは9月下旬になってからで, その後11月下旬まで産卵は続いた.以上のように, 本種は卵と成虫の2発育ステージで休眠に入り, その生活史をサンゴジュの生育相に適合させているものと考えられた.越冬卵は2月中旬には休眠から覚醒してくる.休眠覚醒後の卵の発育零点を6℃とし, 2月16日を起算日とした場合, 平均気温より求めた50%ふ化日までの有効積算温度は94日度となった.
Seasonal Development of Pyrrhalta humeralis (CHEN) (Coleoptera: Chrysomelidae), with Special References to the Hatching Time of Overwintering Eggs. Norizumi SHINKAJI (Faculty of Horticulture, Chiba University, Matsudo, Japan), Tetsuzo HAMAMURA and Wataru ASHIHARA (Akitsu Branch, Fruit Tree Research Station, Akitsu, Hiroshima, Japan) Tech. Bull. Fac. Hort. Chiba Univ., No.26: 67-73, 1979. Pyrrhalta humeralis (CHEN) is one of the major pests of Viburnum awabuki K. KOCH planted as windbreak or hedge in southern Japan. In order to make clear about the seasonal development of this leaf beetle, some studies were conducted from 1975 to 1977 in Hiroshima Pref. P. humeralis was univoltine, and overwintered in the egg stage as a mass under the bark near the buds of V. awabuki. In the spring, from mid-March to early April, newly larvae hatched out from the overwintering eggs, and fed on the expanding leaves of V. awabuki. After grown up to the 3rd instar, the larvae dropped to the ground from the leaves, and developed into pupae in the soil from mid-May to early June. The adults emerged from early June to early July, and fed on the matured leaves of V. awabuki throughout the summer and the autumn season. The eggs were laid during the period from middle of September to late of November as a mass under the bark by the female beetles passed the summer season. From the above-mentioned seasonal development, it was inferred that this leaf beetle adapted her seasonality to the vegetation period of V. awabuki by diapausing in two stages of the egg and the adult. It was assumed that diapause in the overwintering eggs terminated by mid-February from the results of warming treatment (20℃) at 15- or 30-days intervals from October to next March. Based on the relation between temperature and velocity of the postdiapause development of the over-wintering eggs, the threshold for development was estimated to be 6℃. The sums of effective temperature above 6℃ from February 16 to the dates of 50 1.475460e-268gg hatch in the field were 92

公開者 千葉大学園芸学部
コンテンツの種類 紀要論文 Departmental Bulletin Paper
DCMI資源タイプ text
ファイル形式 application/pdf
ISSN 0069-3227
NCID AN00142658
掲載誌情報 千葉大学園芸学部学術報告 Vol.26 page.67-73 (19790228)
情報源 The technical bulletin of Faculty of Horticulture, Chiba University
言語 日本語
著者版フラグ publisher

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