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Annual Bluegrass, Poa annua, Poa

Poa annua L.

Poaceae (Grass Family)

▲▼ young, but flowering plants

▲▼ older plants, with lighter green color than surrounding turf

 ▲▼annual bluegrass growing in a creeping bentgrass golf green (lighter green spots with silvery inflorescences)

Annual Bluegrass

·         cool-season annual, sometimes perennial (in northern U.S. states)

·         short (3/16-6" tall), pale green leaves ending in a keeled tip

·         silvery-green panicle inflorescence can appear when plant has only 3-4 leaves

·         can tolerate close mowing (putting green height)

·         produces many seeds, which may germinate over very long periods of time 

 

Control:

·         pre-emergent herbicides, fungicides (rubigan), growth regulators (paclobutrazol)

·         difficult to eradicate; once on a site, always need to maintain control practices to keep it from spreading

 

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