Durability and concentration of organic colorant in the visual quality of Discovery TM bermudagrass

Nascimento, Matheus Vinícios Leal do; Santos, Patrick Luan Ferreira dos; Costa, João Victor; Martins, Juliana Trindade; Bôas, Roberto Lyra Villas; Godoy, Leandro José Grava de

doi:10.1590/2447-536x.v26i4.2211

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…Alternatively, perennial ryegrass overseeding could be skipped and substituted with painting (Nascimento et al., 2020) to allow for the use of additional herbicide sites of action and the reduction of the annual bluegrass seedbank in locations with ethofumesate resistance. Additional research on the effectiveness of different IWM practices is needed at sites with resistance as well as an examination of potential cross resistance among ethofumesate resistant annual bluegrass populations.…”

Section: Discussionmentioning

confidence: 99%

A survey of ethofumesate resistant annual bluegrass (Poa annua) on US golf courses

Vukovic,

Mattox,

Kowalewski

et al. 2024

Crop Forage & Turfgrass Mgmt

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Annual bluegrass (Poa annua L.) is the most troublesome weed on golf courses in the US. Many agronomic practices intended to promote high‐quality playing surfaces favor the growth and development of annual bluegrass, resulting in high weed pressure. One commonly used herbicide for annual bluegrass control on golf courses is ethofumesate, which is a very long chain fatty acid inhibitor. Annual bluegrass resistance to this herbicide is documented and confirmed in grass seed production systems, but potential resistance on golf courses was previously unknown. The objective of this study was to determine the frequency and magnitude of potential ethofumesate resistance from a sample of US golf courses. A dose‐response experiment was initiated at Purdue University using 30 annual bluegrass populations collected from Alabama, California, Indiana, and Oregon golf courses. Ten ethofumesate doses included 0, 0.5, 1.0, 2.5, 5.0, 7.5, 10.0, 15.0, 20.0, and 40.0 lb a.i. acre−1, with 1.0 to 2.0 a.i. acre−1 as the standard label application rate for perennial ryegrass turf. A low level of resistance (R/S < 3) was found in several populations collected in each state. The mean effective dose necessary to kill 50% of the populations (ED50) was 5.1, 9.2, 3.5, and 3.4 lb a.i. acre−1 for populations from Alabama, California, Indiana, and Oregon, respectively. The most resistant population originated from California, with an ED50 of 13.2 lb a.i. acre−1. To reduce selection pressure from ethofumesate populations, golf course superintendents are encouraged to develop site‐specific weed control programs that rotate herbicide sites of action, as well as utilize diverse control tactics.

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Section: Discussionmentioning

confidence: 99%

A survey of ethofumesate resistant annual bluegrass (Poa annua) on US golf courses

Vukovic,

Mattox,

Kowalewski

et al. 2024

Crop Forage & Turfgrass Mgmt

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“…The Discovery TM turfgrass (Cynodon dactylon) is a bermudagrass variety developed in Australia and the USA. It is highly regarded for its applications in residential and commercial areas, mainly due to its desirable characteristics such as soft leaves, uniform growth pattern, and slow growth rate (Nascimento et al, 2020;Prates et al, 2020;Silvério et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Biostimulants in initial Growth of DiscoveryTM Bermudagrass

Santos,

Zabotto,

Silva

et al. 2024

Ornam. Hortic.

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The use of bacteria and seaweed extracts as biostimulants to enhance plant growth holds promise for sustainable turfgrass management. This study aimed to investigate the effects of soil application of Azospirillum brasilense (bacterium) and Ascophyllum nodosum (seaweed) extract on the initial growth of DiscoveryTM bermudagrass. The study was conducted using a completely randomized design with plots measuring 0.25 m², each with a 0.5 m border. Two separate experiments were conducted, each involving four doses of biostimulants and five repetitions. The biostimulant treatments consisted of 0, 2, 4, and 6 mL L¹ A. brasilense inoculant and 0, 5, 10, and 15 mL L¹ A. nodosum seaweed extract. These treatments were uniformly applied to the soil at a rate of 100 mL m², with applications at 0, 30, and 60 days after the start of the experiment. After 90 days, the parameters green color index, green cover rate, turfgrass height, and vegetation index (normalized difference), were evaluated. The results indicated that both biostimulants significantly promoted the initial growth of DiscoveryTM bermudagrass. As the doses of the biostimulants increased, there was a corresponding increase in biomass and improved development of the turfgrass. The most pronounced responses were observed with a dose of 6 mL L¹ of the bacteria inoculant and 15 mL L¹ of the seaweed extract. These biostimulants fostered better turf coverage, making it challenging for weeds to establish, and potentially accelerating the production of sod grass.

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“…Given resolute capture of temporal variation is a foremost attribute of multispectral radiometry relative to visual or other assessment (Leinauer et al., 2014; Roberson et al., 2021; Trenholm et al., 2000), efficacy trials conducted on identically maintained turfgrass cultivars may include both colorant combination products and one or more canopy evaluations by multispectral radiometry > 24‐h following application (Nascimento et al., 2020). Yet unlike the above‐cited guidance regarding the 0‐ to‐24‐h postapplication period, explicit caution concerning subsequent reliance is absent from the scientific literature.…”

Section: Introductionmentioning

confidence: 99%

Reduced creeping bentgrass fairway reflectance following synthetic colorant application

Leiby

Schlossberg

2022

Agricultural & Env Letters

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Repeated measures using multispectral radiometry resolutely quantify canopy attributes of identical turfgrass cultivars under similar management. Concern regarding multispectral radiometric characterization of turfgrass canopies <24 h following synthetic phthalocyanine colorant application has been affirmed and is accordingly now avoided; yet explicit guidance on subsequent employ, at time(s) > 24-h postapplication, is lacking. Our objective assessed how petroleum-derived spray oil (PDSO) and synthetic Cu II phthalocyanine colorant (CPC) combination product influences creeping bentgrass (Agrostis stolonifera L.) reflectance up to 10 d following application. A maintained fairway received semimonthly 9.76 kg ha -1 soluble N treatments alone or in combination with 27 L PDSO+CPC ha -1 . Treatment by PDSO+CPC increased mean shoot growth (kg ha -1 ) and dark green color index (DGCI) calculated by visible waveband reflectance. Yet reduced far red and near infrared reflectance from PDSO+CPC treated plots artificially deflated mean normalized differential vegetative indices. Cautious interpretation of vegetative indices relying on 710-to-810nm canopy reflectance is encouraged when evaluating fairways treated by PDSO and Cu II phthalocyanine combination product(s).

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Durability and concentration of organic colorant in the visual quality of Discovery TM bermudagrass

Cited by 6 publications

References 16 publications

A survey of ethofumesate resistant annual bluegrass (Poa annua) on US golf courses

A survey of ethofumesate resistant annual bluegrass (Poa annua) on US golf courses

Biostimulants in initial Growth of DiscoveryTM Bermudagrass

Reduced creeping bentgrass fairway reflectance following synthetic colorant application

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