Plant Affliction, Plague
This page is the CodyCross answer for the clue below from Science Lab, Group 309, Puzzle 4 (Chemical Reaction).
Question is: Plant Affliction, Plague
and the answer is: BLIGHT
Word Meaning:
BLIGHT — A diseased condition suffered by a plant; specifically, a complete and rapid chlorosis, browning, then death of plant tissues such as floral organs, leaves, branches, or twigs, especially one caused by a fungus; a mildew, a rust, a smut.
Definitions from Wiktionary.