P. myriotylum is a hemi-biotrophic organism belonging to the Oomycetes class. It is widespread in India, China, Japan, Nigeria, Fiji, Australia, Sri Lanka, Hawaii and Korea . P. myriotylum is not only pathogenic to ginger but also to many other crops, such as cocoyam, bean, groundnut, tomato, tobacco and watermelon, resulting in significant decreases in yield and quality .