Prodiamine is a mitotic inhibiting herbicide regularly used to control annual bluegrass PRE. A population of not controlled by prodiamine at 1,120 g a.i. ha −1 was identified on golf course in Alcoa, TN, 2012. whole-plant hydroponics bioassay screen this biotype for resistance (PR) compared with known susceptible (SS). Multitiller (i.e., > 4 tillers) PR and SS plants were established hydroponic culture exposed 0, 0.001, 0.01, 0.10, 1.0, 10.0 mM prodiamine. Exposure 0.001 reduced root...

Interspecific hybrid bermudagrass [Cynodon dactylon (L.) Pers. x C. transvaalensis Burtt-Davy] is one of the most widely used grasses on golf courses, with cultivars derived from 'Tifgreen' or 'Tifdwarf' particularly for putting greens. Many established greens can be genetically unstable and lead to occurrence undesirable off-type that vary in phenotype. The objective this research was phenotypically differentiate cultivars. Beginning 2013, desirable samples were collected course...

Plant growth regulators (PGRs) are commonly applied to ultradwarf hybrid bermudagrass [ Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt‐Davy] putting greens during the growing season. Trinexapac‐ethyl (TE) and prohexadione‐Ca (PH) PGRs that inhibit gibberellic acid biosynthesis used reduce clipping yield improve turfgrass visual quality. Growing degree day (GDD) models have optimized timing of PGR reapplications creeping bentgrass ( Agrostis stolonifera L.) greens, but no information...

Turfgrass managers currently have few readily available means of evaluating herbicide resistance in annual bluegrass during the growing season. Research was conducted to determine if agar-based diagnostic tests developed for agronomic weeds could be used reliably confirm harvested from golf course turf. Annual phenotypes with target-site acetolactate synthase (ALS; R3, R7), enolpyruvylshikimate-3-phosphate (EPSPS; R5), and photosystem II (PSII; R4) inhibiting herbicides were included...

Abstract Species of Zoysia Willd. are used on approximately 9550 ha golf course surfaces throughout the United States, primarily fairways and tees in transitional climates. Recently, cultivars featuring dwarf canopy height improved quality have been released for putting green use; however, tolerance these to postemergence herbicides is unknown. Field research was conducted 2021 2022 evaluating Prizm ® [ matrella (L.) Merr.] Lazer Z. Merr. × minima (Colenso) Zotov] zoysiagrass pyrimisulfan +...

‘MSA 2‐3‐98’ (Reg. No. CV‐284, PI 689102) is a cold‐tolerant, high‐quality St. Augustinegrass [ Stenotaphrum secundatum (Walt.) Kuntze] developed at Mississippi State University. MSA 2‐3‐98 was released on 19 Apr. 2006 from Agricultural and Forestry Experiment Station. offers many advantages compared with other cultivars. Leaf length, leaf width, internode diameter of were significantly smaller than ‘Floratam’ ‘Raleigh’. The more diminutive morphology allows it to establish denser turfgrass...

Abstract Juncus tenuis Willd. is a warm‐season, perennial weed of turfgrass. In wet and compacted soils, it well documented, yet little known regarding the interaction effects compaction soil moisture on its rooting foliar growth. A greenhouse experiment examined above‐ belowground growth J. . The experimental design was completely randomized with 3 × arrangement four replications two runs. Factors included (bulk densities 1.56, 1.77, 2.00 g cm –3 ) (10.9, 27.9, 59.6% volumetric water...

This presentation covers current research at the University of Tennessee on management off-type grasses in ultradwarf bermudagrass putting greens.  It was initially presented 2016 Bermudagrass Forum for Georgia chapter Golf Course Superintendents Association America.

The R script is from an experiments regarding the response of bermudagrass off-types and cultivars to increasing rates trinexapac-ethyl.  The variable clipping weight expressed as mg per square cm. experiment was a completely randomized design with grass sample trinexapac-ethyl rate in factorial treatment arrangement.  Time after included analysis repeated measure.  There are also three replications two experimental replicates that were combined create additive blocking factor analysis.  A...

Abstract Plant growth regulator (PGR) applications are a common practice in managing ultradwarf bermudagrass [ Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt‐Davy] putting greens. Trinexapac‐ethyl (TE) is frequently used PGR to reduce the rapid shoot that could ball roll distance (BRD) and increase turfgrass quality. Lightweight rolling (LWR) of greens implemented sustain or BRD. The objective this research was determine effects weekly TE LWR on BRD quality an green. Experiments were...

Abstract The golf industry has a $170 billion economic impact in the United States, and vital aspect of sport is course putting green performance. goal management to provide surface on which ball rolled uniformly while maintaining acceptable yearlong turfgrass quality. Several devices have been developed quantify roll dynamics greens; however, there are limited methods measure uniformity. objective this research was assess uniformity by measuring dispersion balls released from modified...

Rescuegrass (Bromus catharticus Vahl.) is found primarily in the southern and western United States where it grows as a winter annual or weak perennial. noted for high salt tolerance, which may allow to proliferate across much of (Allison et al., 1954). Its bunch-type growth habit prolific seed production disrupt functional aesthetic qualities turfgrasses (Holt, 1969). Research evaluating postemergence selective herbicide rescuegrass control has focused on acetolactate synthase (ALS)...

Abstract Application of plant growth regulators to hybrid bermudagrass [ Cynodon dactylon (L.) Pers. × transvaalensis Burtt Davy] putting greens is a common management practice used reduce clipping yield and improve aesthetic functional turfgrass quality. Growing degree day (GDD) models have explored the effects regulator application timing on ultradwarf yield. However, there need for research evaluating GDD‐timed applications quality ball roll. A field study was conducted in summer 2018 at...