Description
Two species of crabgrass are found throughout the semi-tropical and temperate zones of the U.S. – smooth crabgrass (Digitaria ischamum) and hairy crabgrass (Digitaria sanguinalis). Both are annual grasses that emerge in early to mid-spring and are killed by the first frost in fall. Crabgrass flowers throughout the summer and is a prolific seed producer. Crabgrass has one significant weakness in that the seed requires light to germinate. Consequently, a dense turf cover effectively resists invasion by crabgrass. But, anything that weakens the turf during the spring and summer, such as disease, insect damage, traffic or winterkill increases the likelihood of a crabgrass invasion. Often, cultural practices such as aeration and dethatching increase the crabgrass problem by exposing the seed to favorable conditions-sunlight, moisture and high temperatures.
Control
Crabgrass control requires a sound turf maintenance program together with a planned herbicide program. A dense turf is the best protection against invasion by crabgrass. Cultural practices that promote a dense, healthy turf include regular mowing and watering together with timely fertilization, aeration and dethatching. Pest management including insect and disease control is also essential to preventing crabgrass invasions.
For the past 25 years, pre-emergent control of crabgrass has been the target of considerable research. A number of very good herbicides have been developed for turf as a result of that research.
Since crabgrass germinates from April through September in most areas of the country (slightly shorter periods in other areas), few of these herbicides provide season-long control. All of these products should be applied about 2 weeks prior to the expected date of emergence of crabgrass. Since this date varies from North to South and from year to year, a specific date must be developed by turf managers from past experiences, climatic conditions and, perhaps, biological indicators.
Selective post emergence control of crabgrass is the responsible choice
Our new Post-emergent crabgrass control service has proven to be a big success. Our service controls the Crabgrass when it is actively growing. Giving you the peace of mind knowing that chemicals are NOT being applied without reason. Give us a call if you experience this ugly invader and we’ll inspect your lawn and decide if a crabgrass control application is needed for your lawn.
