Black Rot (image) Penn State Share Print E-Mail Caption Photographs of inoculated leaves from the four most susceptible and four most tolerant cacao genotypes. The right side of the leaves were inoculated with Phytophthora palmivora myceli; left sides were mock inoculated with a sterile pathogen-growing medium. The top row includes photographs of the four most susceptible varieties, and the bottom row shows the four most tolerant. Credit Penn State Usage Restrictions Non commercial use only Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.