TY - JOUR
T1 - Germinability of annual bluegrass seed during spring in the Eastern United States
AU - Carroll, Devon E.
AU - Brosnan, James T.
AU - McCurdy, James D.
AU - De Castro, Edicarlos B.
AU - Patton, Aaron J.
AU - Liu, Wenwen
AU - Kaminski, John E.
AU - Tang, Kaiyuan
AU - McCullough, Patrick E.
AU - Westbury, David
N1 - Funding Information:
This research is part of a regional collaborative project supported by the USDA‐NIFA, Award No. 2018‐51181‐28436, “Research and Extension to Address Herbicide Resistance Epidemic in Annual Bluegrass in Managed Turf Systems”. The dataset used in this paper was derived from field research experiments conducted by James Brosnan, Devon Carroll, Edicarlos De Castro, John Kaminski, Wenwen Liu, Patrick McCullough, Jay McCurdy, Aaron Patton, Kaiyuan Tang, and David Westbury as part of the project. The authors thank the turfgrass research support staff at the University of Tennessee, Mississippi State University, Purdue University, the Pennsylvania State University, and the University of Georgia for their assistance in conducting this research.
Funding Information:
This research is part of a regional collaborative project supported by the USDA-NIFA, Award No. 2018-51181-28436, ?Research and Extension to Address Herbicide Resistance Epidemic in Annual Bluegrass in Managed Turf Systems?. The dataset used in this paper was derived from field research experiments conducted by James Brosnan, Devon Carroll, Edicarlos De Castro, John Kaminski, Wenwen Liu, Patrick McCullough, Jay McCurdy, Aaron Patton, Kaiyuan Tang, and David Westbury as part of the project. The authors thank the turfgrass research support staff at the University of Tennessee, Mississippi State University, Purdue University, the Pennsylvania State University, and the University of Georgia for their assistance in conducting this research.
Publisher Copyright:
© 2021 The Authors. Crop, Forage & Turfgrass Management © 2021 American Society of Agronomy and Crop Science Society of America.
PY - 2021
Y1 - 2021
N2 - Soil seedbank management via collecting clippings may be a means of combatting herbicide resistance in annual bluegrass (Poa annua L.) by minimizing recruitment from the deposition of viable seed into the soil. Our objective was to assess the germinability of annual bluegrass seed in spring to determine when collecting clippings would be most impactful. Research was conducted across 2019 and 2020 in five locations: Knoxville, TN; Starkville, MS; Griffin, GA; West Lafayette, IN; and University Park, PA. Annual bluegrass seed was harvested every 100 growing degree-days (GDD0C; base 0 °C with accumulation beginning on 1 January each year from 400 to 1,100 GDD0C. Seeds from each harvest timing were placed on moistened blotter paper in petri dishes and randomized in a growth chamber set to a 77:68 °F and 8:16 h light–dark cycle. Germination was assessed every 3 d until 21 d of incubation. Cumulative germination percentage after 21 d of incubation increased at research locations in northern latitudes. In Tennessee, germination was greatest from 600 to 900 GDD0C. In Indiana, germination did not exceed 50% until 600 GDD0C and increased with GDD0C accumulation. Clippings should not be collected until at least 600 GDD0C in these locations. In Pennsylvania, little variation existed among GDD0C harvest times, indicating that clipping collection may be a valuable practice any time mature seedheads are present. Turfgrass managers should consider geographic location when selecting a time to implement clipping collections and will probably need to conduct multiple clipping collection events.
AB - Soil seedbank management via collecting clippings may be a means of combatting herbicide resistance in annual bluegrass (Poa annua L.) by minimizing recruitment from the deposition of viable seed into the soil. Our objective was to assess the germinability of annual bluegrass seed in spring to determine when collecting clippings would be most impactful. Research was conducted across 2019 and 2020 in five locations: Knoxville, TN; Starkville, MS; Griffin, GA; West Lafayette, IN; and University Park, PA. Annual bluegrass seed was harvested every 100 growing degree-days (GDD0C; base 0 °C with accumulation beginning on 1 January each year from 400 to 1,100 GDD0C. Seeds from each harvest timing were placed on moistened blotter paper in petri dishes and randomized in a growth chamber set to a 77:68 °F and 8:16 h light–dark cycle. Germination was assessed every 3 d until 21 d of incubation. Cumulative germination percentage after 21 d of incubation increased at research locations in northern latitudes. In Tennessee, germination was greatest from 600 to 900 GDD0C. In Indiana, germination did not exceed 50% until 600 GDD0C and increased with GDD0C accumulation. Clippings should not be collected until at least 600 GDD0C in these locations. In Pennsylvania, little variation existed among GDD0C harvest times, indicating that clipping collection may be a valuable practice any time mature seedheads are present. Turfgrass managers should consider geographic location when selecting a time to implement clipping collections and will probably need to conduct multiple clipping collection events.
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U2 - 10.1002/cft2.20117
DO - 10.1002/cft2.20117
M3 - Article
AN - SCOPUS:85112363676
SN - 2374-3832
VL - 7
JO - Crop, Forage and Turfgrass Management
JF - Crop, Forage and Turfgrass Management
IS - 2
M1 - e20117
ER -