マツノザイセンチュウ伝播者としてのマツノマダラカミキリの役割 Role of Monochamus alternatus(Coleoptera : Cerambycidae)as a Vector of Bursaphelenchus lignicolus(Nematoda : Aphelenchoididae)

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l)マツノザイセンチュウの最も有力な伝播者は, マツノマダラカミキリである。2)大矢野町の枯損木から羽化したマツノマダラカミキリは, 71%がこの線虫を持っており, また1頭当りの持っている線虫数は平均3,146頭, 最高8,783頭であった。3)マツノザイセンチュウは, 耐久型幼虫の形で, マツノマダラカミキリの体表面や上翅裏面に付着しており, また気門(特に腹部第1気門)の中には塊状になってはいっている。4)この耐久型幼虫は, マツノマダラカミキリを高湿度に保つか, 水に浸すと虫体から容易に離脱する。試験管による個体飼育では, 2〜3週目に線虫落下の山がある(20℃, 93%RH)。5)野外では, 耐久型幼虫はマツノマダラカミキリの羽化脱出から産卵を始めるまでの間に, 80%以上が虫体から落ちるものと思われる。6)マツノマダラカミキリの後食部で, 耐久型幼虫は脱皮を行ない, マツ樹体内へ侵入することができる。7)枝の一部を, 羽化脱出直後のマツノマダラカミキリに後食させると, 健全なマツでも枯れてしまい, その枯死木から多数のマツノザイセンチュウが検出できる。8)1939〜'41年にまつくいむしの激害地から採集されたマツノマダラカミキリの標本から, マツノザイセンチュウの耐久型幼虫を検出できたので, 当時のマツ枯損にもこの線虫が関係していたものと思われる。

The severe damage to pine trees(Pinus densifiora and P.thunbergii)in the stands throughout southwestern Japan had been attributed to the attack of bark beetles of the families Cerambycidae, Curculionidae and Scolytidae. These beetles do not attack the bole of healthy pine and oviposite only into the weakened or dead one(Oda, 1967 ; Iwasaki and Morimoto, 1970 & 71). Tokushige and Kiyohara(1969)found a nematode of the genus Bursaphelenchus in wood of the damaged pine trees collected from many localities in Kyushu. Kiyohara and Tokushige(1971)first claimed after their inoculation experiments that this nematode might be one of the main causal agents for the death of pine trees and played an important role in the deterioration of pine forests in southwestern Japan. This nematode is to be named by Mamiya and Kiyohara(in press)as Bursaphe-lenchus lignicolus. From the investigations conducted in 1971,it was confirmed that pine longicorn, Mono-chamus alternatus, plays an important role as a vector of Bursaphelenchus lignicolus, and transmits Dauerlarven of the nematode into healthy pine trees via fed wound on twigs and branches mostly from the middle of May to the beginning of August, and to less extent thereafter. Results obtained are as follows : 1)The authors examined more than 2000 insects and found that 71% of Monochamus alternatus emerging from damaged trees were infested with Bursaphelenchus lignicolus with an average burden of 3146 nemas of the Dauerlarven form. They were recovered from the underside of elytra and spiracles, especially from the first abdominal apiracles(Tab.1,2,3). 2)More than 80% of the Dauerlarven of the nematode are estimated to fall off gradually and randomly from the body of longicorn between the emergence and the beginning of the oviposition (Tab.4,5). 3)Dauerlarven of the nematode, fallen on twigs or branches, moulted on the fed wound and entered into xylem within a considerably short time. This namatode was also recovered from the fed wounds of Monochamus alternatus in natural pine trees(Tab.5). 4)All the healthy pine trees wrapping some branches in nets and reared several new adults of this longicorn in them were dead in about one month after setting supposedly by the influence of the nematode. 5)Dauerlarven of the nematode were also recovered from mounted and alcoholic specimens of Monochamus alternatus(Tab.6).

収録刊行物

  • 日本林學會誌

    日本林學會誌 54(6), 177-183, 1972-06-25

    一般社団法人日本森林学会

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各種コード

  • NII論文ID(NAID)
    110002834619
  • NII書誌ID(NCID)
    AN00198561
  • 本文言語コード
    JPN
  • 資料種別
    Journal Article
  • ISSN
    0021485X
  • NDL 記事登録ID
    7625065
  • NDL 雑誌分類
    ZR21(科学技術--農林水産--林産)
  • NDL 請求記号
    Z18-340
  • データ提供元
    CJP引用  NDL  NII-ELS  IR  J-STAGE 
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