Black Rot of Orchids Caused by <i>Phytophthora cactorum</i> and <i>Phytophthora palmivora</i> in Florida

Fig. 1. Symptoms of black rot caused by Phytophthora cactorum on pseudobulbs and lower leaves of a Cattleya orchid hybrid.



Image from Plant Health Progress article:
Black Rot of Orchids Caused by Phytophthora cactorum and Phytophthora palmivora in Florida