Golf Course Management

OCT 2018

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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72 GOLF COURSE MANAGEMENT 10.18 RESEARCH SAYS • This project aimed to quantify the effects of five winter management practices on winter survival of annual bluegrass wee- vils; treatments were applied to test plots on natural areas of two golf courses in northeastern New York. • Weevil survival was lowest in untreated control plots and in plots where vegeta- tion was removed after mowing or plots were mowed, vegetation was removed and herbicide was applied. • Weevil survival was greatest when vegetation was left in the study area after it had been mowed or treated with herbicide. conditions induced by vegetation manage- ment. For instance, managed habitats with the highest and lowest observed winter sur - vival (herbicide only versus herbicide-mow- remove) also corresponded with the lowest and highest respective degree of variation in winter soil temperature. e presence of exces - sive vegetation at the soil surface may create a more buffered winter habitat for overwinter - ing weevils, but this pattern did not hold for all treatments. Given the persistent and growing chal - lenges of managing annual bluegrass weevil on U.S. golf turf — including pesticide resis - tance and the limited availability of effective pesticides — it is critical to gain a better un - derstanding of annual bluegrass weevil ecol- ogy and how it may be exploited to manage weevil populations. e findings indicate that vegetation management practices employed in annual bluegrass weevil overwintering areas may not have the capacity to enhance control of the weevil. ey do, however, reveal that any practices resulting in accumulated dead plant residue in natural areas could lead to more successful annual bluegrass weevil over - wintering. I anticipate continuing the work on the winter ecology of annual bluegrass weevil to better characterize the relationships between natural area composition and management practices and their impacts on annual blue - grass weevil winter survival and spring dam- age incidence. Acknowledgments ank you to Rob Pierpoint and David Hicks for their assistance and for allowing ac - cess to golf course natural areas, and also to Natalie Bray, Abigail Wentworth and Martin Ward for their contributions to the project. Literature cited 1. Diaz, M.D.C., and D.C. Peck. 2007. Overwintering of annual bluegrass weevils, Listronotus maculicollis, in the golf course landscape. Entomologia Experimen - talis et Applicata 125:259-268. 2. Kostromytska O.S., S. Wu and A.M. Koppenhöfer. 2018. Cross-resistance patterns to insecticides of several chemical classes among Listronotus macu - licollis (Coleoptera: Curculionidae) populations with different levels of resistance to pyrethroids. Journal of Economic Entomology doi: 10.1093/jee/tox345 Kyle Wickings (kgw37@cornell.edu) is an assistant profes - sor in the Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Ithaca, N.Y. Soil temperature Figure 5. A soil temperature snapshot taken Jan. 11-24, 2017, illustrates the differences in soil surface temperature among the five management treatments in a natural area at Robert Trent Jones GC in Ithaca, N.Y. Herbicide only Mow, remove clippings Control Apply herbicide, mow, remove clippings Mow ºF/ºC 77/25 68/20 59/15 50/10 41/5 32/0 23/-5 14/-10 5/-15 January 11-24, 2017 Temperature (ºF/ºC)

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