Annual Bluegrass

Pest: Annual Bluegrass (Poa annua)

Pest Type: Weed

Major Identifying Features: 3-12 inches tall, branched flower heads with clusters of 3-6 flowers at the tip of each branch. It has light green, short, smooth leaf blades that are folded on the tip, boat-shaped leaves

Life Cycle: Winter annual, germinates in fall

Pest Rating: Major

Management Rating: Moderate

Host/Season/Outbreak Information: It can grow any time of the year. It is adapted to cool and moist, coastal areas and shade, more common in lawns and parkways. It germinates in late summer or fall when temperatures drop to 70°

Damage Information: It can form a dense patch in ornamental plantings which are aesthetically distracting, but has little detrimental effect on shrubs and trees

Management Options: Preventing new infestation by cleaning landscape equipment, removing plants before they go to seed, isolating patches of invasion, frequent hand pulling, closely spaced ornamentals can make it more difficult for seeds to germinate


Dreistadt, Steve H., and Jack Kelly. Clark. Pests of Landscape Trees and Shrubs: An Integrated Pest Management Guide. Oakland, CA: U of California, Division of Agriculture and Natural Resources, 1994. Print.


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