What kind of pre-emergent herbicide for my turf grass?

One concern with preemergence herbicide use is timing of application. In a typical year, the earliest germinating crabgrass may be killed by subsequent frosts. However, in order to be effective, the preemergence herbicide must be applied before the first crabgrass that germinates following the last frost. It must also be activated by either rainwater or irrigation after application. Typically, they are applied two to three weeks earlier, when an indicator plant, such as Forsythia in the northern United States or dogwoods in South, bloom.

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756567 Annual Bluegrass-Poa annua

Annual Bluegrass-Poa annua

Annual bluegrass is a winter annual weed with a bunch-type growth habit. Leaves are folded in the bud, have a boat shape tip, membranous ligule, and often have a wrinkled section near the middle of the blade. Annual bluegrass produces a panicle type seedhead that is triangular in shape, with bunched spikelets. Fruits are present throughout the life cycle, however the majority of the seedheads are formed in the spring.

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