PACE Turf - Turfgrass Information Center

Poa seedhead weather

Growing degree days base 0 C (GDD0C) and timing of application that resulted in good control of poa seedheads. Trial conducted by Galen Evans, 13 year member of the GCSAA and superintendent at Laytonsville Golf Course in Gaithersburg, MD. Good control of poa seedheads was observed when the second and third applications of ethephon were separated by 197 GDD0C. The recommended reapplication timing is 200 GDD0C.

All applications were made in 2 gal/1000 sq ft using 110-10 air induction nozzles. Rates are per 1000 sq ft.
1st application 12/4/2017
     Oskie (27% ethephon) 3.33 oz, 8 oz Civitas
2nd application 3/29/2018, 340 GDD0C
     Oskie 3.3 oz, 2.0 oz Lesco Iron
3rd application 4/18/2018, 537 GDD0C
     Oskie 3.3 oz, Primo 0.125 oz, Lesco Iron 2 oz, Strobe
     (50% azoxystrobin) 0.407 oz,  N (21-0-0) 0.07 lb

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