ヤノネカイガラムシの越冬令構成の地域性について

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  • 大串 龍一
    長崎県総合農林センター果樹部
  • 宮下 栄蔵
    長崎県総合農林センター果樹部 長崎県経済農業協同組合連合会

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タイトル別名
  • Studies on the Local Variation of Age Distribution of the Overwintering Arrowhead Scale, <i>Prontaspis yanonensis</i> KUWANA in Nagasaki Prefecture
  • ヤノネカイガラムシ ノ エットウレイ コウセイ ノ チイキセイ ニ ツイテ

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抄録

The age distribution, mortality and the development of ovaries of overwintering arrowhead scale, Prontaspis yanonensis collected from 26 stations of Nagasaki Prefecture were examined three times viz, in late January, mid March and early May of 1963.<br>Most of the samples examined in January and March show that the overwintering population of this scale consists of 2nd instar larvae and full grown male larvae and juvenile and mature female adults. But some of the samples collected from the stations at Shimabara Peninsula and Nishisonogi Peninsula contained 1st instar male larvae and 2nd instar female larvae.<br>Winter mortality of this scale was showed by the proportion of living individuals against the total number of living and dead individuals. The mortality of the 1st and the 2nd instar larvae was 70-100%, of juvenile adults was 20-60% and of matured adults was 10-30% among female scales. Significant fluctuations of mortality between stations were not observed.<br>Almost all the samples collected in early May were consisted of mature female adult with exception of the ones came from the the station of southern part of Shimabara Peninsula, Iki Island, and Tsushima Islands. In these stations, juvenile female adults were found. It seems that these juvenile individuals overwintered at the stage of 2nd instar larvae.<br>In early May, the 1st brood of this scale bigan to hatch out. Number of the establishing 1st instar larvae per adult females were larger at some stations such as Kuchinotsu, Shimabara (Shimabara Peninsula), Ôseto (Nishisonogi Peninsula) and Mogi (Nomo Peninsula).<br>Development of ovum were examined in March by dissection of adult ovaries. Number of developing ovum in ovarieles per one female was about 5 at two stations in southern part of Shimabara Peninsula and about 2 at the other stations.<br>From these observation, the local variation of age distribution and development of ovum in overwintering arrowhead scale were recognized. In Nagasaki Prefecture, district of south western seaside such as Shimabara, Nomo and Western Nishisonogi where show the overwintering of young larvae and development of ovum in adult females, differ from the other districts. These districts bordered by the isothermal line of mean temperature 16.5°C.

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