Golf Course Management

JUL 2015

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

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07.15 GOLF COURSE MANAGEMENT 85 flled with a standard golf course cup-cutter core of centipedegrass [Eremo loa o iuroides (Munro.) Hack] from a sod farm in Arapa - hoe, N.C. (fne loamy sand). Medium-to-large hunting billbug larvae were collected manu - ally from centipedegrass at the sod farm and used for the larval trials to maintain the same host plant and feld conditions for the larvae. Three separate trials were initiated on April 3, April 24 and May 1, 2012. Each con - tainer represented one replicate, and each trial consisted of fve replicates per insecticide treat - ment. Five larvae were introduced into each container using the same methods used for the adult billbugs. Treatments were also applied in the same manner as the experiments targeting the adult billbugs, with the same irrigation re - gime and methods for sampling and record- ing outcomes. Four insecticides were tested for larval control: Acelepryn, Arena 50 WDG, Imidacloprid 2F and Talstar P (Table 1). Results Adul unting billbugs Recovery of adult hunting billbugs was >90%, indicating that this technique is ad - equate to document billbug mortality for experiments evaluating insecticide effcacy. In 2011, Talstar P, Arena 50 WDG and Fe - rence all produced >80% mortality (Figure 1). Imidacloprid 2F and Acelepryn had lower adult mortality. Mortality in the controls was low, which indicates that containing billbugs through this technique produced minimal mortality. It is important to note that, even though the imidacloprid application did not produce >80% mortality, it was not statisti - cally different from Arena 50 WDG or Fe- rence (Figure 1). In 2012, Aloft GCSC and Arena 50 WDG produced >80% mortality (Figure 1). Talstar P, Imidacloprid 2F, Allectus SC and Zylam Liquid had lower adult mortality. There was no mortality in the controls. As mentioned above, the bifenthrin and imidacloprid treat - ments were not statistically different from the bifenthrin + clothianidin or clothianidin treatments, and the bifenthrin + imidacloprid treatment was not statistically different from the clothianidin treatment (Figure 1). Combination products. For the products that contain two active ingredients, it is im - portant to note how much of each active in- gredient was applied. The Aloft GCSC treat- ment comprised 0.1 pound ai/acre (112.08 grams/hectare) of bifenthrin and 0.2 pound (Top) The beak of the billbug provides a way of distinguishing billbugs from other turfgrass beetles. (Bottom) An adult hunting billbug as seen from above.

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