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The Nutgrass Borer or Nutsedge Borer (''Bactra venosana'') is a moth of the Tortricidae family. It has a wide distribution, from southern Europe, North Africa and Asia Minor to India, Sri Lanka, southern China, Malaya, Australia and into the Pacific where it is found on Java, Borneo, the Philippines, Taiwan, Timor, the Solomons, the Carolines and Fiji. It was introduced to Hawaii in 1925 to control nutsedge. It is now found on Kauai, Oahu, Molokai, Maui, Lanai and Hawaii. The larvae feed on ''Cyperus rotundas'' and ''Kyllingia'' species, including ''Kyllingia brevifolia'' and ''Kyllingia monocephala''. They bore the stem of their host plant. Affected plants first show a withering of the inner leaves, which become yellow and finally die. Young larvae are pale, glassy yellowish, with a shining black head. Full-grown larvae are green or pale yellowish. They spin a tube of silk in the stem and in this cocoon sheds its skin to turn into a pupa of about 5–7 mm long. ==External links== *(Insects of Hawaii. Volume 9, Microlepidoptera ) *(Species info ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bactra venosana」の詳細全文を読む スポンサード リンク
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