Estimation of high infection period of root rot pathogen to ginger tubers under an open-field condition

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To estimate the infection period of a root rot pathogen of ginger (Pythium myriotylum Drechsler) under an open-field cultivation condition, an inoculation test was conducted under field conditions for two cultivation seasons. The pathogen infection was confirmed by the LAMP method and symptoms were observed from late May 2016 to mid-September and 2017. This demonstrates that the pathogen can infect ginger tubers for more than four months from early to mature stages of the plant under field conditions.