Interaction of Meloidogyne incognita、Pratylenchus coffeae and Rhabditis sp. on banana (Musa spp.)

• Main Authors: Ming-Hung Chien, 簡銘宏
• Other Authors: 蔡東纂
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/57685593157193434582

碩士 === 國立中興大學 === 植物病理學系 === 93 === The field surveys showed the Root-knot nematodes are dominate plant parasitic nematodes in banana plantation of central Taiwan. Usually more than one plant parasitic nematode species were presented in the same plantation. Field data indicated the presence of free-living nematodes would lower plant parasitic nematodes number. Therefore, this study was to confirm the interaction between M. incognita and P. coffeae which were two most prevailed species in the local area, and also for the first time to study the role of free-living nematodes (Rhabditis spp.) in banana nematode diseases. M. incognita was the dominate species when interact with P. coffeae, and the results agreed with the survey of banana plantations. In the experiment studying the interaction between Rhabditis spp. and M. incognita or Rhabditis spp. to P. coffeae respectively, results indicated Rhabditis spp. would affect the population of P. coffeae at eary stage, and both M. incognita and P. coffeae were inhibited by Rhabditis spp. at the later stage. The disease index results in the same experiment show that lower galling index and higher necrosis index when Rhabditis spp. was presented. However, when M. incognita, P. coffeae and Rhabditis spp. were inoculated together the disadvandage of P. coffeae to M. incognita would be improved. At the later stage of disease development, the presence of Rhabditis spp. enhanced the symptoms and also decreased the plant weight. The petridish experiment results suggested that root wounds were the major attractants to Rhabditis spp. The mechanisms as to how free living nematode enhancing nematode disease still need to be studied.