Identification of <i>Aulacaspis yasumatsui</i> found on Amami-Oshima Island and its damage to<i> Cycas revoluta</i>

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  • 奄美大島でみられたソテツシロカイガラムシ（新称）（半翅目：マルカイガラムシ科）の同定とソテツの被害発生状況
  • アマミ オオシマ デ ミラレタ ソテツシロカイガラムシ(シンショウ)(ハンシモク:マルカイガラムシカ)ノ ドウテイ ト ソテツ ノ ヒガイ ハッセイ ジョウキョウ

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<p>In 2022, mass yellowing of Cycas revoluta leaves caused by a scale occurred on Amami-Oshima Island. We identified the scale as Aulacaspis yasumatsui, a worldwide cycad pest. The occurrence was reported as the first record of the A. yasumatsui in Japan. In this paper, we report on the identification details and the survey on the distribution and damage in the Amami Islands. We identified the scale based on its morphological characteristics and then confirmed the identification based on its nucleotide sequences of COI and COII regions of mitochondrial DNA. The nucleotide sequence of COI barcode region (630 bp) in our sample from Amami-Oshima Island is 100% identical to that from Fujian Province in China previously reported. The scale was found in Amami City, Tatsugo Town, Yamato Village and Uken Village. In C. revoluta, where this scale occurs, the leaves ranged from those with no yellowing to those with all leaves yellowed. Severe damage, such as yellowing of all the leaves, and mass yellowing was concentrated in near the Naze Port in Amami City.</p>

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