Evaluation of <i>Phytophthora ramorum</i> in Nursery Crop Tissue Culture Propagation

Fig. 1. Disease symptoms of rhododendron ‘Nova Zembla’ (A) and hydrangea (B) inoculated with sporangia of Phytophthora ramorum A1 and A2 mating types (right and middle, respectively) isolates placed at the black dot at the edge of the medium. Non-inoculated control flasks are on the left.



Image from Plant Health Progress article:
Evaluation of Phytophthora ramorum in Nursery Crop Tissue Culture Propagation