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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Tylenchulus semipenetrans ： ウィキペディア英語版 Tylenchulus semipenetrans ''Tylenchulus semipenetrans'' (Citrus nematode, Citrus root nematode) is a plant pathogenic nematode and the causal agent of slow decline of citrus. ''T. semipenetrans'' is found in most citrus production areas and diverse soil textures worldwide. Their feeding strategy is semi-endoparasitic and has a very narrow host range among commonly grown crops. These nematodes are considered as major plant-parasitic nematode because they can cause 10-30% losses reported on citrus trees. They also parasitize other hosts such as olive, grape, persimmon and lilac.〔Verdejo-Lucas, S. and Mckenry, M.V. 2004. Management of the Citrus Nematode, Tylenchulus semipenetrans. Journal of Nematology 36: 424-432〕 The citrus nematode was first discovered in California in 1913 by J.R. Hodges and was later described and named by Nathan Cobb that year. 〔http://entnemdept.ufl.edu/creatures/nematode/citrus_nematode.htm〕 == Morphology == ''T. semipenetrans'' is the only species of Tylenchulidae that are economically important to agriculture. Citrus nematode range from 0.25-0.35 mm long. They have an amalgamated procorpus and metacorpus, distinct isthmus, and a bulb-shaped postcorpus. They are distinct in juveniles. Both the juvenile stages and the adult male stage are vermiform in shape. The male has significantly reduced esophagus and stylet. The posterior end of the female citrus nematode becomes swollen upon feeding. She contains a single ovary and the vulva is subterminal. The female will lay up to 100 eggs deposited in a gelatinous matrix secreted from the nearby excretory pore. The pore is surrounded by small, irregularly shaped lobes; and the excretory duct is directed forward. The rectum and anus are atrophied or absent; non-functional.〔http://www.ipm.ucdavis.edu〕 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「Tylenchulus semipenetrans」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.