Does Coring Impact Pre-emergent herbicide Efficacy?

Products that are applied to control weeds prior to their germination and emergence from the ground are called pre-emergent herbicides. Pre-emergent herbicides are primarily applied in the spring to control summer annual weeds like crabgrass (Digitaria spp) and goosegrass (Eleusine indica). During spring on many sports fields coring is done on intensively trafficked turfgrass sites to relieve soil compaction.

Possible concern arises when coring is done after the pre-emergent herbicide is applied. The belief is coring will break the herbicide barrier resulting in increased weed germination, establishment and invasion. Rresearch on both cool and warm season turfgrasses found that coring after a pre-emergent application, to a turf that has good density, no increase in weed pressure was found (1, 2).

References

1. Branham, B.E. and P.E. Rieke. 1986. Effects of turf cultivation practices on the efficacy of preemergence grass herbicides. Agronomy Journal 78:1089-1091.

2. Johnson, B.J. 1982. Oxadiazon treatments on overseeded putting green turf. Weed Science 3):335-338.

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