Author：Chou, Chien-Ming^1,*, Lin, Feng-Chyi², Deng Ting-Chin¹, Chien, Yi-Hsuan¹, Chen, Chun-Tao³, Chen, Yi-Ju², Tsai, Chin-Hui¹, and Huang, Hsiu-Wen⁴

Abstrct：

    Maize chlorotic mottle virus, MCMV, was first reported in sweet corn in Taiwan in 2014. Symptoms of MCMV included mottle or mosaic developing into maize leaf chlorosis and necrosis. Moreover, severe plant stunting and death were observed. Phylogenetic analysis of full capsid protein sequence of MCMV isolated from maize field revealed that the invaded MCMV in Taiwan shared 98-99% identity with the Chinese and Kenyan MCMV isolates. MCMV causes severe yield loss in the main maize planting area in Taiwan, including Yunlin County, Chiayi County and Tainan City, and becomes the limiting factor of maize production in Taiwan. According to the field survey result during 2014 April to 2015 April, MCMV are widely distributed in Taiwan. Analysis of the virus disease epidemic demonstrates that MCMV is prevalent from October to the coming May next year. Detection of fresh seeds from ear of MCMV infected maize shows that seeds have very high rate contaminated with MCMV. The presence of MCMV in seeds raises the risk of virus transmission through seeds. To analyze the mode of MCMV transmission by maize thrips (Frankliniella williamsi Hood) in Taiwan, we assayed the maize thrips virus acquisition and transmission ability. The result demonstrates adult maize thrips have higher virus acquisition ability than larva. The result of virus transmission via maize thrips demonstrates that to be able to transmit virus efficiently we need to put sufficient thrips in one maize plants. The effective control of MCMV should be achieved by the integration of cultural practices with suitable insecticides and host tolerance.

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¹ Plant Pathology Division, Taiwan Agricultural Research Institute
² Applied Zoology Division, Taiwan Agricultural Research Institute
³ Hsinchu Branch, Bureau of Animal and Plant Health Inspection and Quarantine
⁴ Tainan District Agricultural Research and Extension Station
* Corresponding Author, E-Mail:cmchou@tari.gov.tw; Fax:(04)23302803.

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