PACE Turf - Turfgrass Information Center

GDD32 and poa

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This excerpt from the San Diego PACE Turf Weather Alert illustrates the environmental conditions that resulted in the seedhead development in this photo. The advanced seedhead development is not surprising because there has been more than 800 GDD32 (Growing Degree Day base 32 F) since mid December. Once seedheads begin to show up, applications of seedhead suppressants every 200 GDD32 have been effective. Arrows mark approximately 200 GDD32 increments in the past.

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