Jason A. Ferrell’s research while affiliated with Theology & Sciences Institute of Florida USA and other places

What is this page?


This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.

Publications (210)


Figure 3. Percentage of Sporobolus indicus var. pyramidalis mortality (30 d after treatment) in response to wiping method (unidirectional vs. bidirectional) and increasing concentrations applied with a handheld weed wiper in studies conducted under field conditions in Florida in 2017 and 2018. Solid and dashed lines represent predicted values. Data were fit to a two-parameter log-logistic regression model: Y = exp[b(log x -log e)], where Y is the response, x is the concentration rate, b is the slope of the inflection point, and e is the inflection point of the fitted line (equivalent to the concentration necessary to promote 70% of S. indicus var. pyramidalis mortality [ED 70 ]). Data points were averaged across years and herbicides.
Figure 4. Percentage of Sporobolus indicus var. pyramidalis mortality (60 d after treatment) in response to wiping method (unidirectional vs. bidirectional) and increasing concentrations applied with a handheld weed wiper in studies conducted under field conditions in Florida in 2017 and 2018. Solid and dashed lines represent predicted values. Data were fit to a two-parameter log-logistic regression model: Y = exp[b(log x -log e)], where Y is the response, x is the concentration rate, b is the slope of the inflection point, and e is the inflection point of the fitted line (equivalent to the concentration necessary to promote 70% of S. indicus var. pyramidalis mortality [ED 70 ]). Data points were averaged across years and herbicides.
Research sites, locations, and soil characteristics
Log-logistic regression parameter estimates (±SE) for percentage of Sporobolus indicus var. pyramidalis mortality at 30 d after treatment (DAT) from the handheld weed-wiper experiment, Florida, 2017 and 2018
Effectiveness of integrating mowing and systemic herbicides applied with a weed wiper for Sporobolus indicus var. pyramidalis management in Florida
  • Article
  • Full-text available

May 2024

·

43 Reads

Invasive Plant Science and Management

Jose C.L.S. Dias

·

·

Brent A. Sellers

·

[...]

·

Philipe Moriel

Sporobolus indicus (L.) R. Br. var. pyramidalis (P. Beauv.) Veldkamp is an invasive species in grasslands, and herbicide application has been the most efficient management method to suppress this weed. Experiments were conducted to determine the effects of wiping glyphosate and hexazinone on S. indicus var. pyramidalis in 2017 and 2018. A dose-response experiment using a hand-held weed wiper was established with twenty treatments comprising two herbicides (glyphosate and hexazinone), uni- and bi-directional wiping methods, and five herbicide concentrations (6.25, 12.5, 25.0, 50.0 and 100% v/v basis). Data were collected 30 and 60 days after treatment (DAT). An ATV-mounted roto-type weed wiper experiment was established in a strip plot arrangement with mowing as the horizontal strip, the wiping method (uni-directional vs bi-directional) randomized as the vertical strip with three dosages of each herbicide for a total of 12 wiping treatments. Data were collected 35 and 90 DAT. The percent plant mortality was calculated using differences in pre- and post-treatment plant counts. Analysis of variance (ANOVA) and log-logistic linear regression were used to analyze the data. The dose-response experiment showed that S. indicus var. pyramidalis mortality increased with herbicide concentration and mortality was greater with the bi-directional wiping method compared to the uni-directional method. Treatments wiped bi-directionally with glyphosate at 70% v/v, hexazinone at 30% v/v and hexazinone at 60% v/v, resulted in S. indicus var. pyramidalis mortality ranging from 75 to 98% by 90 DAT across all locations. The ATV-mounted weed-wiper experiment showed that mowing prior to herbicide application with weed-wipers decreased the efficacy of both herbicides. Overall, both experiments indicate that S. indicus var. pyramidalis should be wiped bi-directionally using either glyphosate (70% v/v) or hexazinone (at least 30% v/v) to obtain satisfactory control. Further work should be conducted to determine if seasonality impacts the response of S. indicus var. pyramidalis to mowing and the application of these herbicides.

Download


Shoot and root growth rates under salinity treatments. Each point and error bar represent the mean and standard error for four observations. Species marked with the (*) are non-native in Florida, USA
Determined salinity thresholds for each aquatic plant species. The intermediate level shows the estimated LC50 value calculated based on visual quality data. Lower limit signifies the lowest salinity level that affected plant growth and visual quality, and upper limit denotes the highest salinity level that plant could survive for six or 9 weeks exposure before mortality. Species marked with the (*) are non-native in Florida, USA
Guideline for assigning visual quality scores to plants (1–10)
Salt tolerance assessment of aquatic and wetland plants: increased salinity can reshape aquatic vegetation communities

July 2022

·

273 Reads

·

9 Citations

Hydrobiologia

Salinization is a great threat to wetlands and freshwater ecosystems. Increased salinity can disturb native aquatic vegetation and provide an empty niche for invasion of non-native species. To understand the fate of aquatic flora under increased salinity levels, 14 dominant wetland species with different growth forms (submersed, amphibious, floating-leaved, emergent and woody/tree) were exposed to increased salinity conditions. The objective was to assess the salt tolerance threshold for each species and model their performance in response to a salinity gradient ranging from 0.2 to 20 parts per thousand (ppt). Plant growth and survival rate were analyzed using a nonlinear regression model to project sublethal salinity concentrations that would reduce biomass and visual quality of each species by 50% (LC50). Results showed that a few non-native species (alligatorweed: Alternanthera philoxeroides (Mart.) Griseb., torpedograss: Panicum repens L., and Brazilian peppertree: Schinus terebinthifolius Raddi) survived 20 ppt salinity, whereas all other native and non-native species perished at salinity below 10 ppt. Increased salinity can suppress salt-sensitive native plants and increase the opportunity of invasion for salt-tolerant non-native species. This suggests that alligatorweed, torpedograss and Brazilian peppertree pose a more significant threat to the ecosystem if salinity levels continue to increase in freshwater ecosystems and exacerbate the encroachment of non-native species into native plant communities.



Florida's Organo-Auxin Herbicide Rule—2021: SS-AGR-12/WG051, rev. 12/2021

December 2021

·

3 Reads

·

1 Citation

EDIS

Organo-auxin (phenoxy) herbicides have found a place in weed control schemes for peanut, corn, small grains, sugarcane, turf, pasture and forage crops, and many other areas. It is the intent of this publication to clarify and disseminate the Florida Organo-Auxin Herbicide Rule to interested growers and applicators. Major revision by B. Bultemeier, J. A. Ferrell, and G. E. MacDonald; 4 pages.https://edis.ifas.ufl.edu/wg051



Weed Management during Pasture Establishment: SS-AGR-287/AG290, rev. 8/2021

September 2021

·

17 Reads

EDIS

This publication details techniques for chemical weed control prior to and during pasture establishment and is intended for county Extension faculty as well as owners and managers of grazing lands. Written by Brent Sellers, Pratap Devkota, Joao Vendramini, and Marcelo Wallau, and published by the UF/IFAS Agronomy Department, revised August 2021.



Hairy Indigo Control in Peanut

May 2021

·

9 Reads

EDIS

This publication provides county Extension agents, growers, and pesticide applicators with information on hairy indigo control options in peanut. Written by Jason Ferrell, Blaire Colvin, and Pratap Devkota, and published by the UF/IFAS Agronomy Department, revised May 2021.


Weed Management in Sesame

May 2021

·

41 Reads

EDIS

Sesame is a relatively new grain crop being grown in Florida. This publication discusses rotational considerations and herbicides for use in sesame. Written by Jason Ferrell and Pratap Devkota, and published by the UF/IFAS Agronomy Department, revised April 2021.


Citations (61)


... Thus, one can easily manipulate experiments to report a large sensitivity reduction in the putative resistant population by choosing the most sensitive individuals as reference. For more examples of the challenges distinguishing between herbicide resistance and tolerance see Thum et al. (2023). ...

Reference:

Resistance or tolerance: Distinction without a difference
Confusion and Ambiguity with the Terms Resistance and Tolerance in Aquatic Plant Management

Weed Science

... Seawater intrusion in the aquifers and low-lying areas will make the water resources saline and unusable (Prusty & Farooq, 2020). Saltwater flooding will alter the flora and fauna (Hoggart et al., 2014;Tootoonchi et al., 2023), and the species diversity in the Point Calimere wetland will suffer from these changes. The overall seasonal composite maps recorded a high water level during monsoon and a low water level during premonsoon. ...

Salt tolerance assessment of aquatic and wetland plants: increased salinity can reshape aquatic vegetation communities

Hydrobiologia

... Both grass and broadleaf weeds were recorded in the summer trial, suggesting that sorghum is associated with both broadleaf and grass weeds. a number of studies have shown that sorghum is associated with both grass and broadleaf weeds (Ferrell et al., 2022;Galon et al., 2018;Mamudu et al., 2019;pandian et al., 2021;tibugari et al., 2020a). in summer, most of the grass and broadleaf weeds that were recorded in the field were sparsely distributed and were minor weeds. however, in summer, two broadleaf weeds, A. conyzoides and R. scabra, which coincidentally have not been reported to be suppressed by sorghum allelopathy in table 1, were dominant. ...

Weed Management in Sorghum: SS-AGR-06/WG002, rev. 01/2022
  • Citing Article
  • January 2022

EDIS

... Para controle das brotações, é utilizado o "rolo-faca", a remoção manual das brotações com o uso de foices, ou o controle químico com herbicidas, que é considerado um método eficaz e barato. Essa técnica vem sendo utilizada em plantios de espécies florestais, como em Eucalyptus populnea e E. largiflorens com butil 2,4,5-T ou a mistura de picloram e 2,4,5-T com óleo diesel (ROBERTSON & PEDERSEN, 1973;FERRELL et al., 2010;SCHALAU, 2011) ou o triclopyr isolado ou combinado com glifosato e metsulfuronmetil em E. macarthurii, que possui alta capacidade de rebrota (LITTLE & VAN DEN BERG, 2007). SOTO (1998) destacou que os métodos mais comuns de controle da rebrota de tocos de teca é o manual com a remoção da casca dos tocos para retirada das gemas e o uso de herbicidas. ...

Herbicide Application Techniques for Woody Plant Control: SS-AGR-260/AG245, 1/2006
  • Citing Article
  • May 2019

EDIS

... For the past five years, Ethiopia produced between 550,000 and 750,000 quintals in areas with a 30,000 to 45,000 ha range (CSA, 2019). It is grown in 44, 464.46 ha areas in Ethiopia, with a yield and productivity of 4.3 million quintals and 97.4 quintals per ha, respectively (Tiwari et al., 2021). Ethiopian mustard was grown on 14,661.2 ...

Emergence Patterns of Winter and Summer Annual Weeds in Ethiopian mustard ( Brassica carinata ) Cropping System

Weed Science

... Nozzle size or type [15][16][17] and spraying volume [18][19][20][21] have a key impact on the atomization performance of herbicide solution, determining the number of droplets deposited on target weeds and ultimately influencing the efficacy of herbicides [22][23][24]. In particular, the nozzle is an important component in intelligent spraying machines that ensure spraying quality. ...

Effect of Carrier Volume and Application Method on Waterhyacinth Response to 2,4-D, Glyphosate, and Diquat
  • Citing Article
  • January 2021

Invasive Plant Science and Management

... The most essential benefits of conservation agriculture are increasing irrigation efficiency by reducing soil erosion and maintaining soil moisture content (Bondarovich et al., 2021) and minimizing wind and water erosion using leaving agricultural crops' residues on the soil surface Das et al., 2020;Seitz et al., 2019;Gozubuyuk et al., 2020). Conservation agriculture also contributes to the management of energy consumption and reduction of environmental pollution (Jat et al., 2020;Nandan et al., 2021), preserves soil nutrients, increases soil organic matter, reduces pests and diseases, and controls weeds using crop rotation (Kanatas, 2020;Tiwari et al., 2021;Pardo et al., 2021). Therefore, this conservation agriculture system creates an opportunity to reduce cultivation costs, improve resource productivity, and reduce fertilizers and pesticides in agricultural production, which aims to make optimal use of all agrarian resources (Dhar et al., 2018;Tama et al., 2021). ...

Growing Winter Brassica carinata as Part of a Diversified Crop Rotation for Integrated Weed Management

... Unfortunately, acidic herbicides are excluded from multi-compound analysis or are only involved for screening purposes due to their instability and poor solubility in the generic extraction solvent and the need for pH-sensitive extraction techniques. This is probably the reason why bio-assays with plants used as an indicator of AP residues are still recommended [13,14,16,20,21], rather than its direct analytical determination. ...

Herbicide Residues in Manure, Compost, or Hay
  • Citing Article
  • June 2017

EDIS

... De nombreuses recherches ont déjà mis en évidence que le contrôle de cette espèce par des moyens uniquement techniques était difficile et peu efficace (Pennycook 1998). En effet, R. ulmifolius présente de fortes capacités de reproduction et de croissance (Ferrell and Sellers 2009). Combiner un traitement chimique à un traitement mécanique semble être une méthode plus efficace (Klimkowska et al. 2010). ...

Blackberry and Dewberry: Biology and Control
  • Citing Article
  • December 2020

EDIS

... Watch this video from UF/IFAS Extension Manatee County to see how littoral plantings help break the waves. In addition, planting native plants densely may hinder the re-establishment of problematic invasive plant species which have been previously removed (Enloe et al., 2022). Invasive species are those plants introduced by humans that can cause environmental, economic, or human harm (Iannone et al., 2021). ...

Integrated Management of Non-Native Plants in Natural Areas of Florida
  • Citing Article
  • August 2018

EDIS