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Poa annua

Poa annua is annual grass weed from the large poa family that tends to act as an annual grass in irrigated situation. This species which is sometimes referred to as “annual winter” grass or “green-keepers curse” is endemic in soils throughout temperate parts of the world. It is a relatively small grass plant which is light green to yellow green in colouration and it seeds prolifically throughout the year. The seeds are white in colour and the leaf blades are soft and often crinkled when young. Poa annua is often confused with poa trivialis which is an annual weed. It seeds prolifically and will seed regardless of cutting height. It is probably the most common grass weed problem on lawns in New Zealand.

Control

Ryegrass, Tall fescue, N.Z. Browntop:

 Apply EXPO 500S at 40mls per 100m2. This will need to be applied twice within 14 days. It does act as a pre-germination spray and as such can be applied directly over freshly sown ryegrass seed to avoid poa annua infestations. Repeat applications will be required in 3 -4 months time.

Fine Fescue lawns:

 Apply Gallant or Ignite at label rates from September through until April. It is advisable not to use this product in winter as it tends to discolour the fescue.

Couch:

 Apply roundup at a 5% solution when the couch is growing rapidly.  

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