Kevin E Kenworthy

Kevin E Kenworthy
University of Florida | UF · Department of Agronomy

Ph.D.

About

91
Publications
15,801
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
866
Citations

Publications

Publications (91)
Article
Zoysiagrasses were introduced into the United States from Asia and provide attractive turf throughout much of the United States. In recent years, newer cultivars of zoysiagrass have entered the market with improved insect resistance, accelerated establishment, and better overall performance. This 8-page major revision of the Environmental Horticult...
Article
Several new bermudagrass cultivars are available and commonly used on golf course fairways. However, little is known about their cultural requirements or how these cultivars perform under lower inputs regimes. A 2‐year study was conducted at University of Florida, Fort Lauderdale Research and Education Center, to assess performance of four hybrid b...
Article
Full-text available
This publication provides the most up-to-date information on adapted cool-season forage varieties. Written by M. Wallau, A. R. Blount, E. Rios, J. M. B. Vendramini, J. C. B. Dubeux, Md. A. Babar, K. E. Kenworthy, M. Mulvaney, and K. H. Quesenberry, and published by the UF/IFAS Agronomy Department, revised August 2021.
Article
Full-text available
St. Augustinegrass [Stenotaphrum secundatum (Walter) Kuntze] is a turfgrass extensively used in managed landscapes in Florida and throughout the SE USA. To develop cultivars with broad adaptation, it is necessary to understand the effect of genotype by environment interaction (GEI). The objective of this study was to estimate genetic parameters in...
Article
In breeding programs, superior parental genotypes are used in crosses to generate novel genetic variability for new selection cycles. Genotypes are usually more adapted to environments where the breeding program is located, since selections are performed under specific agroecosystems. Thus, the objective of this study was to evaluate the performanc...
Article
All known species of zoysiagrass are tetraploids (2n = 4x = 40) but octoploids have been reported. This research was conducted to evaluate ploidy variability from a stand of zoysiagrass where an 8x clone (E11) originated, and to characterize progeny from E11 and other ploidy variable clones. Clone ploidy was determined by flow cytometry and clones...
Article
‘DALZ 1308’ (Reg. no. CV‐285, PI 691612) is a first‐generation interspecific hybrid developed in 2004 by crossing a genotype of Zoysia minima (Colenso) Zotov and Z. matrella (L.) Merr. ‘Diamond.’ After field evaluations in Dallas, TX (2004–2009) and Gainesville, FL (2006–2008), DALZ 1308 was selected for advancement to the 2013 Warm‐season Putting...
Article
Full-text available
Characterizing phenotypes in germplasm collections and making data publicly available is crucial to ensure their utilization in breeding programs. Variance component estimates are used to calculate genetic parameters needed to make strategic decisions for germplasm conservation and its utilization in plant breeding. This information is lacking for...
Article
Full-text available
Recent advances in remote sensing technology, especially in the area of Unmanned Aerial Vehicles (UAV) and Unmanned Aerial Systems (UASs) provide opportunities for turfgrass breeders to collect more comprehensive data during early stages of selection as well as in advanced trials. The goal of this study was to assess the use of UAV-based aerial ima...
Article
The cover image, by Jing Zhang et al., is based on the Drought Stress article Drought responses of above‐ground and below‐ground characteristics in warm‐season turfgrass. https://doi.org/10.1111/jac.12301.
Article
Full-text available
The Tifton Turfgrass Breeding Program has a long history of releasing high quality turfgrass varieties. Today, the goal of the program is to create turfgrasses that are adapted to a broader range of environments and have improved drought and traffic tolerance. The latest commercial turfgrass release from Tifton is DT-1, an interspecific triploid (2...
Article
Water shortages have become more chronic as periodic droughts prolong and water demand for urban and agricultural use increases. Plant drought responses involve coordinated mechanisms in both above‐ and below‐ground systems, yet most studies lack comparisons of root and canopy responses under water scarcity and recovery. This is particularly true o...
Article
Although it is known that drought tolerance can be associated with membrane fatty acid (FA) unsaturation, a relevant study is lacking in zoysiagrass (Zoysia spp.) and St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze.]. Our objectives were (i) to substantiate that variation exists among species and genotypes for leaf tissue FA composition...
Article
Full-text available
Randomized complete block (RCB) design is the most widely used experimental design in biological sciences. As number of treatments increases, the block size become larger and it looses the capacity to control the variance within block, which is its original purpose. A method known as post hoc blocking could be used in these cases to improve the gen...
Article
Characterization of rooting capacity in the greenhouse is a routine screening procedure for assessing a plant’s ability to cope with drought stress. However, an association between rooting capacity in the greenhouse and turf performance in the field during drought is not always found. The objectives of the study were (i) to classify zoysiagrass (Zo...
Article
Two diseases of St. Augustinegrass (SAG) [Stenotaphrum secundatum (Walt.). Ktze.] are caused by different anastomosis groups (AGs) of Rhizoctonia solani. Brown patch (BP) is a foliar disease of little economic importance, and large patch (LP) causes leaf sheath rot and death of affected turfgrass shoots and stolons. St. Augustinegrass genotypes wer...
Article
Shade or reduced sunlight poses a major challenge for maintaining acceptable turfgrass quality. The quantification of daily light integral (DLI, mol m⁻² d⁻¹) requirement could help to identify shade-tolerant germplasm. The objectives of this study were (i) to compare turf performance, and (ii) to determine seasonal DLI requirement of 12 warm-season...
Article
Full-text available
A study describing the overall physiological responses to drought and exploring the underlying mechanisms in multiple turfgrass species and genotypes is needed to make improvements in breeding for turfgrass species that are tolerant to water-limiting conditions. The objective of this study was to compare the differential canopy and physiological re...
Article
The development of a turf-type bahiagrass could have a remarkable impact on the billion-dollar turf industry in the south-eastern United States. The goals of this study were to (i) select bahiagrass genotypes with improved turf attributes and (ii) determine the reproductive mode and seed fertility of selected genotypes. The population included muta...
Article
Full-text available
Understanding phenotypic plasticity and pat­terns of biomass allocation of turfgrass under shade is needed for better turfgrass manage­ment and the development of cultivars that per­sist under shade. The objectives of this study were to (i) compare turf performance and deter­mine the relationship between the phenotypic plasticity in growth, biomass...
Article
Full-text available
Use of bermudagrass (Cynodon dactylon) cultivars resistant/tolerant to plant-parasitic nematodes is an important component of integrated pest management (IPM) for sustainable turf nematode management in sandy coastal soils of the Southeastern United States. A multi-year field experiment evaluated five bermudagrass genotypes [‘Tifway’, standard susc...
Article
‘FL PE’ (Reg. No. CV-280, PI 675350) diploid annual ryegrass (Lolium multiflorum Lam.) is a synthetic cultivar selected for later maturity, excellent cold tolerance, and resistance to crown rust (caused by Puccinia coronate Corda) and gray leaf spot (caused by Pyricularia grisea Sacc.) It offers sufficient cold tolerance to be grown in the northern...
Article
‘FL Red’(Reg. No. CV-281, PI 678572) tetraploid annual ryegrass (Lolium multiflorum Lam.) is a synthetic cultivar selected for later maturity and resistance to annual ryegrass crown rust caused by Puccinia coronata Corda and gray leaf spot caused by Pyricularia grisea Sacc. FL Red was synthesized originally in 2004 from equal quantities of ‘Jumbo’,...
Article
Full-text available
Understanding rooting dynamics using the minirhizotron technique is useful for cultivar selection and to quantify nematode damage to roots. A 2-yr microplot study including five bermudagrass ('Tifway', Belonolaimus longicaudatus susceptible; two commercial cultivars [TifSport and Celebration] and two genotypes ['BA132' and 'PI 291590'], which have...
Article
Full-text available
Irrigation for commercial and residential turf is becoming limiting, and water scarcity is one of the long-term challenges facing the turfgrass industry. Potential root development and profile characteristics of turfgrass provide important information regarding their drought resistance mechanisms and developing drought-resistant cultivars. The obje...
Article
‘NUF-76’ (Reg. No. CV-276, PI 674513) St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] was developed from a series of complex crosses and is suitable for use as a turfgrass in lawns in the southern United States. It is resistant to southern chinch bug (Blissus insularis Barber) biotypes in Florida and North Carolina, is the first diploid...
Article
Full-text available
Annual ryegrass (Lolium multiflorum Lamarck) is planted annually on more than 1 million ha of pastures in the southeastern United States. The exact ploidy level and genome size of the annual ryegrass germplasm collection (USDA-ARS, Germplasm Resources Information Network - GRIN) are unknown and the future use of this germplasm relies on their deter...
Article
In Florida, St. Augustinegrass (Stenotaphrum secundatum) is the most commonly used turfgrass species. Sting nematode (Belonolaimus longicaudatus) is recognized as a limiting factor to St. Augustinegrass in Florida, where 'Floratam', a polyploid, is the predominant cultivar; although the use of new diploid cultivars is increasing. The objective of t...
Article
Full-text available
Seed production is a critical component in agricultural systems based on bahiagrass and ergot has been reported to significantly reduce seed quality in tetraploid cultivars. Seed yield and quality are important traits to evaluate in the advanced breeding lines developed at the University of Florida. Resistance to ergot was assessed in seven tetrapl...
Article
Southern crabgrass is a common turfgrass weed throughout the United States, and in Florida a troublesome problem in St. Augustinegrass lawns. Because of herbicide label changes and lack of herbicide tolerance, no POST herbicides are currently registered for homeowner use for crabgrass control in residential and commercial St. Augustinegrass lawns....
Article
Full-text available
Periodic drought, irrigation requirements, and the enforcement of mandatory watering restrictions have posed a challenge for homeowners and landscape managers to maintain acceptable turf quality during dry periods. Information regarding irrigation requirements and performance of common turfgrass species used for residential and commercial landscape...
Conference Paper
Full-text available
Bahiagrass (Paspalum notatum Flugge) is extensively used in pastures in the southeastern US due to its adaptive characteristics to subtropical conditions. An increasing demand for attractive landscapes maintained with minimum inputs warrants improving the aesthetic value of bahiagrass. Breeding strategies differ for diploid and tetraploid bahiagras...
Article
Full-text available
ADDITIONAL INDEX WORDS. flow cytometry, octoploid, simple sequence repeat markers, Zoysia ABSTRACT. Zoysiagrass (Zoysia sp.) is used as a warm-season turfgrass for lawns, parks, and golf courses in the warm, humid and transitional climatic regions of the United States. Zoysiagrass is an allotetraploid species (2n = 4x = 40) and some cultivars are k...
Article
Full-text available
The hunting billbug, Sphenophorus venatus vestitus Chittenden, is a pest that damages stems, rhizomes, and roots of zoysiagrass through a combination of adult and larval feeding. Management of this pest is difficult because it has multiple, overlapping generations in the southern United States, and symptoms of infestations are often misdiagnosed an...
Article
Common carpetgrass is a warm-season grass species that is commonly used as a pasture grass in Louisiana and as an alternative low-maintenance lawn grass in the southern Unites States. Understanding genetic variation for traits related to seed production is important to determine breeding strategies for improvement. Ten genotypes were analyzed for n...
Article
Characterization of Fluazifop-P-butyl Tolerance in Zoysiagrass CultivarsPOST control of grass weed species and contaminant turfgrass species, such as common and hybrid bermudagrass, is a major challenge in zoysiagrass. Fluazifop-P-butyl is a POST herbicide that can provide selective grass weed control with limited injury to zoysiagrass. However, be...
Article
Full-text available
Forage legumes and grasses provide the basis for the worldwide ruminant animal livestock industry, and most of these forages come from perennial pasture plants. As animal agriculture has intensified, pest pressures on perennial forages often also become more prevalent. Among these pest plant parasitic nematodes, especially root-knot nematodes (RKN)...
Article
Full-text available
‘DALSA 0605’ (Reg. No. CV-274, PI 671959) is an embryo rescue-derived interploid hybrid of St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] resulting from a cross between TAES 5382 (African triploid PI 291594) and ‘Palmetto’ (diploid). DALSA 0605 was evaluated under the designation TAES 5471-18 and TXSA 19 and was approved for release as...
Conference Paper
A greenhouse study was conducted within a controlled environment at the University of Florida during the month of July, 2012. The study was set up in a randomized complete block design (RCBD), with four replications (separately for dry down and well water treatments) of sixteen warm season turfgrass genotypes comprised of commercial cultivars and e...
Conference Paper
Determining an efficient process for screening drought responses of turfgrasses would facilitate breeding for drought resistant species and cultivars. Measurements of transpiration rate, stomata regulation and root development could serve as criteria for separating turfgrasses with different responses under drought. In this study, eight zoysiagrass...
Conference Paper
Bahiagrass (Paspalum notatum Flügge) is a warm-season perennial grass widely used for forage and low maintenance turf applications in Florida. Diploid races reproduce sexually, while tetraploid races reproduce by apomixis. Apomixis is a clonal reproductive mode and plants that reproduce exclusively by apomixis are known as obligate apomicts. Howeve...
Conference Paper
Full-text available
Flowering plants can reproduce sexually (outcrossing and/or selfing) and/or asexually. Sexual reproduction implies the successful completion of meiosis and double fertilization for the formation of both the embryo and the endosperm. In contrast, gametophytic apomixis is an asexual mode of reproduction through seeds, that in-volves parthenogenetic e...
Conference Paper
Full-text available
Seashore paspalum (Paspalum vaginatum Swartz) is a warm-season grass with several attributes widely used for golf courses due to its fine to medium leaf texture. Dollar spot caused by Sclerotinia homoeocarpa is one of the most significant diseases of seashore paspalum. The disease is primarily managed using fungicides; however resistance to fungici...
Article
Full-text available
Bahiagrass (Paspalum notatum Flügge) is a persistent perennial warm-season grass well adapted to the southern Coastal Plain of US, where it is used primarily as forage for grazing cattle, and to a lesser extent as a low maintenance turfgrass, and as groundcover in crop rotations. Novel bahiagrass genotypes created by inducing somatic mutations from...
Article
St. Augustinegrass, Stenotaphrum secundatum (Walt.) Kuntze, is used as lawn grass throughout the southern United States for its wide adaptation to varying environmental conditions. The southern chinch bug, Blissus insularis Barber, is the plant's most damaging insect pest. Host plant resistance of St. Augustinegrass has been determined in numerous...
Patent
A newly discovered, and asexually propagated genotype of Seashore Paspalum turfgrass with a distinct set of agronomic, horticultural, morphological, and insect resistant traits.
Article
Full-text available
St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] is a warm-season turfgrass broadly distributed across the southern United States. Here, we investigated genetic diversity and ploidy levels in publicly available plant introductions and cultivars of St. Augustinegrass as an aid to more effective use of these materials in breeding programs....
Article
Full-text available
St. Augustinegrass [Stenotapharum secundatum (Walt.) Kuntze] is the predominant turfgrass in Florida and other areas of the southeastern Coastal Plains of the USA. The wide spread planting of the cultivar ‘Floratam’ led to the selection of a southern chinch bug (Blissus insularis Barbar) biotype that overcame the resistance originally identified in...
Article
Full-text available
Zoysia Willd. are warm-season turfgrasses used throughout the southern United States and upward into the transition zone for their superior heat and drought tolerances and their relatively low input requirements. Understanding the population structure present within Zoysia germplasm can assist plant breeders in exploiting available variation. The o...
Conference Paper
Root morphology is considered important in selecting for field drought performance of warm season turfgrass species. There is considerable variability among turfgrass genotypes in their rooting behavior. A mini-rhizotron camera system was used to study rooting behavior of two commercial warm season turfgrass species from April to June, 2011 and 201...
Data
All rights reserved. No part of this periodical may be reproduced or trans mitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has be...
Conference Paper
Reliance on a chemical option as the only management strategy for pest management is never an ideal situation. Use of hybrid bermudagrass (Cynodon dactylon x Cynodon transvaalensis) cultivars resistant or tolerant to Belonolaimus longicaudatus is essential for sustainable turf management in sandy coastal soils of the southeastern United States. B....
Article
Full-text available
St. augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] is a popular turfgrass in the southern United States as a result of its superior shade tolerance and relatively low input requirements. However, it is the least cold-tolerant of commonly used warm-season turfgrass species. ‘Raleigh’, released in 1980, has superior cold tolerance and is ada...
Article
Full-text available
Paragrass is a nonnative category I invasive species in central and south Florida. This perennial grass species outcompetes native vegetation and is capable of rapid spread by vegetative reproduction. Although glyphosate and imazapyr are effective herbicides for paragrass control, the use of herbicides in certain areas may be restricted because of...
Article
Full-text available
Nonnative para grass (Urochloa mutica [Forsk.] T.Q. Nguyen) is no longer used as forage and has invaded Florida wetlands. This perennial grass out-competes native vegetation and grows into monotypic swards, resulting in unsuitable wildlife habitat. The goal of this research was to improve wetland ecosystem health by reducing para grass invasions vi...
Data
'Ultimate' (Reg. No. CV-260, PI 652947) zoysiagrass (Zoysia japonica Steud.) was developed and approved for release by the Florida Agricultural Experiment Station at the Everglades Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida. Belle Glade, FL and initially approved for release in 2004. A plant pa...
Article
Full-text available
Zoysia spp. are warm-season turfgrass species widely used in the transition zone and southern regions of the United States for their superior heat tolerance and relatively low input requirements. A better understanding of the levels of genetic diversity present in Zoysia germplasm could aid in the utilization of these materials in future breeding e...
Article
Full-text available
Breeding and improvement of new bermudagrass (Cynodon spp.) cultivars with superior nematode tolerance are essential because sting nematode (Belonolaimus longicaudatus Rau) is a major limitation for use of bermudagrass in the sandy coastal soils of the southeastern United States. The screening of both African (Cynodon transvaalensis) and common (C....
Article
Water-displacement and WinRHIZO root-scanning methods were compared for efficacy of root damage assessment. Results from both methods were similar and a highly significant relationship was found between the two methods in trial one (r(2) = 0.9968, P < 0.0001) and trial two (r(2) = 0.9988, P < 0.0001). Both protocols provide consistent root volume m...
Article
Full-text available
Belonolaimus longicaudatus and Helicotylenchus spp. are damaging nematode species on bermudagrass (Cynodon spp.) and seashore paspalum (Paspalum vaginatum) in sandy soils of the southeastern United States. Eight bermudagrass and three seashore paspalum cultivars were tested for responses to both nematode species in field plots for two years in Flor...
Article
Sting nematodes (Belonolaimus longicaudatus Rau) are the most damaging nematode species on bermudagrass (Cynodon spp.) in Florida. The recent cancellation of the nematicide fenamiphos has resulted in the need for alternative nematode management tactics. Utilization of resistant or tolerant cultivars could be one of the most environmentally friendly...
Article
Full-text available
Manipulating apomixis for fixing tetraploid bahiagrass (Paspalum notatum Flüggé) hybrids exhibiting superior agronomic characteristics would be a valuable tool for the genetic improvement of this species. The objectives were to create a second generation of hybrids by crossing sexual first-generation tetraploid hybrids (FGTH) and unrelated apomicti...