Below you can find the Parasitic fungi cause this disease of cereal grasses that forms black powdery masses Jeopardy Words Answer. The answer to Parasitic fungi cause this disease of cereal grasses that forms black powdery masses has 4 letters. This clue belongs to the Botany category and is part of Jeopardy Word Level 208. If you scroll near the bottom you will find other clues and answers part of level 208