On warm season fields, winter-annual broadleaf weeds like chickweed, henbit, lawn burweed and hop clover are unsightly during late winter.  Most winter annuals germinate in the fall, yet difficult to see at this time.  During autumn warm season turfgrasses are still green and mask the germinating weeds.  Weeds become more evident when the  bermudagrass goes dormant and the arrival of warmer air temperatures of late winter early spring that accelerate weed growth.  Controlling these weeds with herbicides during autumn usually are effective because of warmer temperatures enhance the translocation of some of the herbicides.  Winter applications are also effective but cooler temperatures may slow the herbicide activity.  If nonselective herbicides are used for winter annual weed control, make sure that the bermudagrass is dormant prior to treatment.