Identifying and Distinguishing Seedling and Root Rot Diseases of Sugar Beets

Fig. 9 (A) Spherical, terminal sporangia, characteristic of Pythium ultimum. (B) Aplerotic oospore characteristic of P. ultimum (courtesy of G. Abad).



Image from Plant Health Progress article:
Identifying and Distinguishing Seedling and Root Rot Diseases of Sugar Beets