Weeds to Watch For - Poa Annua
Despite the best of efforts and technology annual bluegrass has continued to remain a problem weed in most turf grasses. Why? The over-riding reason is that annual bluegrass is highly adapted to turfgrass environments. In other words the maintenance procedures (mowing, irrigation, etc.) used in turf grasses creates an ideal environment for this weed. For example, annual bluegrass can be mowed at a height of 1/8 inch and still produce seed. It thrives in compacted soils. It grows well in wet soils. It can produce over 2,000 seeds per plant. Another factor contributing to the continue presence of annual bluegrass is that both annual and perennial biotypes are known to exist. The number of herbicides labeled for the control of annual bluegrass in over seeded and non-over seeded warm-season turf grasses continues to increase. However, regardless of the product selected, the level of annual bluegrass control is influenced by environmental factors, herbicide application timing and uniformly applying the product at the recommended rate. Annual bluegrass is a formidable weed. Careful attention to proper turfgrass maintenance practices, application timing, and following the herbicide label will be necessary to adequately control this problem species.
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