• Algae possess chlorophyll and are able to manufacture their own food.
• Being self-sufficient in this aspect, they are seldom found to depend on other plants in pathogenic condition.
• One exceptional case is that Rust disease is caused by species of Cephaleuros.

E.g.: Cephaleuros virescens and Cephaleuros parasities are two common species found on the citrus, mango, cashewnut, guava and other fruit tree and on tea and coffee plants.