Gray, Powdery Fungal Disease of Plants
Puzzle 15 of Reality TV Pack
Question is: Gray, Powdery Fungal Disease of Plants
and the answer is: MILDEW
Word Meaning:
MILDEW — (phytopathology) A growth of minute powdery or webby fungi, whitish or of different colors, found on various diseased or decaying substances.
Definitions from Wiktionary.