Phytophthora sojae is an oomycete and a soil-borne plant pathogen that causes 'damping off' seedlings and root rot of adult soybean plants. This is a prevalent disease in most soybean growing regions, and a major cause of crop loss. Central to the infection process are the zoopores that are produced in wet conditions and move in water attracted to soybean roots. Zoospores can attach to roots, germinate and infect the plant tissues. Diseased roots develop lesions that may spread up the stem and eventually kill the entire plant. Phytophthora sojae also produces oospores that can remain dormant in the soil over the winter, or longer, and germinate when conditions are favourable. Oospores may also be spread by animals or machinery.

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