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Pratylenchus
''Pratylenchus'' is a genus of nematodes known commonly as lesion nematodes.〔Crow, W. T. (Amaryllis lesion nematode, ''Pratylenchus hippeastri''. ) EENY-546. University of Florida IFAS. 2012.〕 They are parasitic on plants and are responsible for root lesion disease on many taxa of host plants in temperate regions around the world. Lesion nematodes are migratory endoparasites that feed and reproduce in the root and move around, unlike the cyst or root-knot nematodes, which may stay in one place. They usually only feed on the cortex of the root.〔(Lesion nematodes. ) University of Illinois Extension. 1999.〕 Species are distinguished primarily by the morphology of the stylets.〔Norton, D. C. ''Ecology of Plant-Parasitic Nematodes''. 1978.〕
==Hosts and symptoms==
Root lesion nematodes infect a great variety of hosts. ''Pratylenchus penetrans'' alone has over 350 host plants. They include agricultural crops such as potatoes, corn, bananas, and wheat. The genus is found most often in corn.〔Perry, R. N. and M. Moens (eds.) ''(Plant Nematology )''. CABI. 2006.〕 Signs of disease are similar in most plants and generally include necrotic lesions of the roots.〔 The lesions can also be entrances for pathogenic bacteria and fungi, which produce secondary infections.〔 Above ground the plant becomes stunted, chlorotic, and wilted, and it often dies. A crop field may be patchy as plants wither and die. Root lesion nematodes can cause significant yield losses.〔Barker, K. R., et al. ''Plant Nematode Interactions''. Madison: American Society of Agronomy, Inc. 1998.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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