The New Student's Reference Work/Rust (in plants)

Rust (in plants), a destructive disease caused by the attacks of parasitic fungi, especially injurious to wheat, oats and other cereals. Signs of the disease are spots and lines of black, yellow or brown on stem and leaf. It is one of the most formidable pests that attack grain, annually causing enormous loss. Little progress has been made in combatting it. Varieties that ripen early are less subject to attack. See Æcidiomycetes. Consult Carleton’s Lessons from the Grain-Rust Epidemic of 1904 and the U. S. Dept. of Ag. Farmers’ Bulletin 219.