Seed Borne Late Blight of Potato

Fig. 4. Effect of inoculum density of Phytophthora infestans on emergence of seed pieces of potato cultivar Russet Burbank in Oregon and Washington. Seed pieces were inoculated with sporangia of US-8 in Oregon and US-11 in Washington.



Image from Plant Health Progress article:
Seed Borne Late Blight of Potato