Several weeds cause problems in wheat production.
The most serious weeds are wild garlic and wild onion, mainly wild garlic. Vetch and wild winter peas also are problems, especially if you are producing the grain for seed. Vetch seed are difficult to remove in cleaning. Occasionally, warm-season grasses and broadleafs are a problem in some instances and can greatly reduce grain yields and cause harvesting problems. Do not apply preemergence to other small grains.