Surveying For and Eradicating <i>Phytophthora ramorum</i> in Agricultural Commodities

Fig. 6. Antheridium (A) and fertilized oogonium (B) produced by crossing a Phytophthora ramorum isolate from Viburnum bodnantense cv. Dawn with a P. ramorum isolate from Rhododendron cv. Unique block N10.

Image from Plant Health Progress article:
Surveying For and Eradicating Phytophthora ramorum in Agricultural Commodities