Blue Grass – Should I Reapply Pre-Emergent In November Or December?

Q: I applied pre-emergent to control annual blue grass for my bermuda lawn in early September. Do I need to reapply the pre-emergent one more time in November or December?

A: Much depends on how heavy your annual bluegrass infestation is. If you had a lot then two applications make sense. If you had not so many weeds last spring then one application will usually be fine if you watered it into place last month. Remember that if you do have a lot of annual bluegrass it indicates the bermuda is not growing strongly and your maintenance schedule should be adjusted to help the lawngrass be part of your weed control program.