Hairy Bittercress weeds?

Discussion in 'Pesticide & Herbicide Application' started by ethany, Apr 2, 2010.

  1. ethany

    ethany LawnSite Member
    Messages: 35

    I have this weed on my lawn growing all over, it already has gone to flower and is getting taller by the day.

    First, when do I apply herbicide and how often? In the morning or evening? do I apply when the weed is dry or water it first?

    One more question, I have a herbicide concentrate in my garage and it is at least 2-3 years old,does this stuff go bad?

  2. txgrassguy

    txgrassguy LawnSite Gold Member
    Messages: 3,083

    First of all, ambient temperature will indicate if the ester herbicide can be used or not.
    You should have applied when they first began appearing - and if you have mown first you need to wait at least a day or so for more leaf tissue to emerge.
    Since the battery went bad in my crystal ball I don't know what "herbicide concentrate" you have so to answer more I'll (and the other guys lurking around here) need the following:
    Location/temperature/host turf type/name of the herbicide concentrate/equipment you plan to apply with.
  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,793

    Hairy bittercress is a winter annual. Mowing is a big help. Spray in late fall--when it is hardly visible. The weed naturally disappears when temps hit about 85--but it drops seed first. Seeds sprout in fall.
    Morning or evening is fine. Wet soil or dry is fine. Herbicide works better when weed is gorwing fast/
    Herbicide concentrate does not ususally go bad.
    Last edited: Apr 2, 2010
  4. ethany

    ethany LawnSite Member
    Messages: 35

    When I mow do I have to bag it to prevent the seeds from spreading or would it ok to mulch mow.

    i was thinking of spraying tomorrow morning with ortho weed be gone max then mow on monday.

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