Biology and management of glyphosate-resistant creeping bentgrass Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h128nh28z

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  • A two year study was conducted at two locations to determine the effect of three perennial ryegrass (Lolium perenne L.) row spacings on creeping bentgrass (Agrostis stolonfera L.) biomass and seed production. At Location 1 in 2002, the creeping bentgrass biomass within the 7.62 cm row spacing was less than in either the 15.24 cm or the 30.48 cm row spacing. By May 28, 2002 at Location 1, there was less creeping bentgrass biomass in both the 7.62 cm and 15.24 cm row spacings than in the 30.48 cm row spacing. At Location 2 on the April 20, 2002 biomass harvest, perennial ryegrass row spacings of 7.62 cm and 15.24 cm reduced creeping bentgrass biomass by 44 and 45 g m⁻², respectively, when compared to the 30.48 cm row. The 7.62 cm and 15.24 cm row spacings at Location 2 reduced creeping bentgrass biomass at the May 28, 2002 harvest. There was no difference in perennial ryegrass seed yield in 2002 among the three row spacings in Location 1. Perennial ryegrass seed yield in the 7.62 cm and 15.24 cm row spacings was greater than the yield from 30.48 cm row spacing at Location 2 in 2002. At both locations in 2002, viable creeping bentgrass seeds were collected at perennial ryegrass seed harvest. In 2003, creeping bentgrass biomass harvested from the two narrower spaced rows was less than the 30.48 cm row spacing on the May 15, 2003 biomass harvest. Reducing the row spacing from the standard 30.48 cm to either 15.24 cm or 7.62 cm did not affect perennial ryegrass seed yield at either location in 2003. However, viable creeping bentgrass seeds were produced in all treatments at both locations.
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