Large patch ( Rhizoctonia solani AG 2-2LP) severity on Japanese lawngrass ( Zoysia japonica ) influenced by fungicide and application target site

Benelli, J.J.; Horvath, Brandon J.; Womac, A. R.; Ownley, Bonnie H.; Windham, Alan S.; Sorochan, John C.

doi:10.1016/j.cropro.2017.12.003

Cited by 4 publications

(12 citation statements)

References 27 publications

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“…Our data, combined with that of Benelli et al. (2018) suggest that the most effective control of both zoysiagrass seedheads and RLPD would result with no irrigation after Proxy application and application should be made at higher spray volumes of 2 gal 1000 ft –2 . Furthermore, ethephon and RLPD fungicide applications should be made when the forecast does not predict significant precipitation.…”

Section: Effects Of Postapplication Irrigation Volume On Spring Seedhsupporting

confidence: 69%

“…The incidence and severity of RLPD in the fall and spring in response to irrigation volume was not evaluated at either site; however, as mentioned by Benelli et al. (2018), further investigation is required on the effectiveness of postapplication irrigation volume on large patch control.…”

Section: Effects Of Postapplication Irrigation Volume On Spring Seedhmentioning

confidence: 99%

“…Benelli et al. (2018) reported reduced RLPD severity when fungicides were applied to the lower plant canopy of zoysiagrass, such as the leaf sheath or stem, compared with applications to the leaf blade. Thus RLPD control may be improved by either higher spray application volumes or possibly postapplication rainfall or irrigation to allow for greater canopy penetration.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Irrigation following a fall Proxy (ethephon) application affects spring seedhead suppression of Meyer zoysiagrass

Patton

Braun

Schortgen³

et al. 2020

Crop Forage & Turfgrass Mgmt

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Section: Effects Of Postapplication Irrigation Volume On Spring Seedhsupporting

confidence: 69%

Section: Effects Of Postapplication Irrigation Volume On Spring Seedhmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Irrigation following a fall Proxy (ethephon) application affects spring seedhead suppression of Meyer zoysiagrass

Patton

Braun

Schortgen³

et al. 2020

Crop Forage & Turfgrass Mgmt

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“…The N source effect may be small, since our underlying bulk soil pH in this field experiment was low (5.5-6) to start and did not change throughout the course of the study due to N source applications. Additionally, the site of deposition on the plant has a profound effect on control of large patch by fungicides (Benelli et al, 2018), and perhaps a greater effect may be noticed if N sources were applied in a sprayable rather than granular form to similarly yield a more consistent and effective coating of the infection court. Area under the nongreen cover curve (AUNGCC) represents the total non-green cover acquired through digital image analysis in SigmaScan and calculated using the trapezoidal rule (Shaner and Finney, 1977;Madden et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Bulk soil pH taken from plugs taken at a 7-to 10-cm depth may not capture a pH shift occurring near the infection site or the upper organic matter layer where the pathogen may reside. Additionally, the site of deposition on the plant has a profound effect on control of large patch by fungicides (Benelli et al, 2018), and perhaps a greater effect may be noticed if N sources were applied in a sprayable rather than granular form to similarly yield a more consistent and effective coating of the infection court.…”

Section: Discussionmentioning

confidence: 99%

Impact of Nitrogen Application Timing, Nitrogen Source, and a Single Fungicide Application on Large Patch of Zoysiagrass

Koehler

Miller

2019

Crop Science

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Large patch is the most severe disease on ‘Meyer’ zoysiagrass (Zoysia japonica Steud.) fairways, tees, and lawns in the US transition zone. A disease management strategy integrating cultural practices would be preferable to multiple fungicide applications. This experiment examined the effects of N application timing, N source, and a single fungicide application on disease severity. Calcium nitrate, urea, and ammonium sulfate were examined for effects on large patch in a greenhouse study. In the field, these N sources were applied on a standard summer schedule, or augmented with fall, spring, or fall + spring applications when 5‐d average 5‐cm soil temperatures reached 18°C. Plots received one spring application of tebuconazole at 0.824 kg a.i. ha−1 on the same day as spring N application or were left unsprayed. Nitrogen source did not affect pathogen infection or disease severity. Spring N applications were most consistent at reducing disease severity compared with summer‐only applications of N. Spring tebuconazole applications did not prevent large patch but reduced overall severity. A management strategy incorporating N applications in the spring could be effective in decreasing large patch outbreaks in the field compared with only applying N in the summer.

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Factors influencing subcanopy leaf and stolon exposure and associated absorption and translocation of herbicides in semidormant zoysiagrass

Craft,

Godara,

Gonçalves

et al. 2023

Weed Sci

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Turfgrass managers are concerned about zoysiagrass (Zoysia japonica Steud.) injury from nonselective herbicide treatment during winter dormancy. Research was conducted to assess factors affecting spray penetration into semidormant ‘Meyer’ zoysiagrass canopies and to evaluate absorption and translocation of 14C-glyphosate and 14C-glufosinate into green leaves and subtending stolons. Absorption of 14C-glyphosate and 14C-glufosinate was up to four times greater when exposed to stolons than leaves. Zoysiagrass leaves treated with 14C-glufosinate had more rapid 14C absorption than those treated with 14C-glyphosate. More 14C translocated out of the treated area following 14C-glyphosate treatment compared to 14C-glufosinate, and moved more readily from stolon to leaves than from leaves to stolon. When extended range, flat fan spray tips (XR) were positioned 61-cm above zoysiagrass, 73% and 11% of recovered colorant was extracted from dormant vegetation in the upper and lower canopy levels. Turbo TeeJet spray tips (TTI) deposited less droplets into the upper canopy and more droplets into the middle and lower canopy regardless of position above the turf surface. Increasing pressure from 103 to 414 kPa increased droplet velocities from XR and TTI nozzles and decreased droplet diameters of XR nozzles. Droplet diameters were also substantially increased when using TTI nozzles compared to XR nozzles. Droplet diameter and associated mass were more determinant of turfgrass canopy penetration than droplet velocity. At 60 L ha-1 of carrier volume, 23% of colorant reached the lower canopy level, and this quantity increased by 2.3% per additional 100 L ha-1. When carrier volume was reduced from 584 to 60 L ha-1, 48% less colorant was delivered to the lower canopy level. Given that subcanopy stolons are always present and absorb more glyphosate and glufosinate than leaves, practices such as avoiding induction-type nozzles, raising spray height, and reducing spray volume can reduce herbicide delivery and potential injury to semidormant zoysiagrass.

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Large patch ( Rhizoctonia solani AG 2-2LP) severity on Japanese lawngrass ( Zoysia japonica ) influenced by fungicide and application target site

Cited by 4 publications

References 27 publications

Irrigation following a fall Proxy (ethephon) application affects spring seedhead suppression of Meyer zoysiagrass

Irrigation following a fall Proxy (ethephon) application affects spring seedhead suppression of Meyer zoysiagrass

Impact of Nitrogen Application Timing, Nitrogen Source, and a Single Fungicide Application on Large Patch of Zoysiagrass

Factors influencing subcanopy leaf and stolon exposure and associated absorption and translocation of herbicides in semidormant zoysiagrass

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