Greenhouse Investigation of Strobilurin Fungicide Applications on Creeping Bentgrass Root Characteristics under Two Irrigation Regimes

Brosnan, James T.; Horvath, Brandon J.; Elmore, Matthew T.; Breeden, Gregory K.; Sorochan, John C.

doi:10.2135/cropsci2010.02.0088

Cited by 11 publications

(27 citation statements)

References 19 publications

(47 reference statements)

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“…Experiments were conducted from August through October 2011 in a glasshouse at the University of Tennessee (Knoxville, TN). ‘Tifway’ hybrid bermudagrass was established from washed sod in mini‐rhizotrons using methods similar to Brosnan et al (2010). In Experiment 1 plants were sodded on 1 Aug. 2011, while plant material for Experiment 2 was sodded on 23 Aug. 2011.…”

Section: Methodsmentioning

confidence: 99%

“…Plants established in each soil were treated with herbicides once root growth reached depths of 5, 10, or 15 cm. Similar to Brosnan et al (2010), rooting depths were determined by measuring the length of the longest subtending root from the crown that was visible along the side wall of each polyethylene tube. Herbicide treatments included indaziflam (Specticle 20 WSP, Bayer Environmental Sciences) at 35, 52.5, or 70 g ha −1 , and prodiamine (Barricade 65 WG, Syngenta Crop Protection) at 840 g ha −1 .…”

Section: Methodsmentioning

confidence: 99%

“…Six weeks after herbicide applications were made at each rooting depth, roots were washed free of either the sand or silt loam rootzone and excised as close to the crown as possible. WinRhizo software (Regent Instruments) was used to characterize root length, root diameter, root surface area, and root‐length density according to methods of Brosnan et al (2010). Root‐length density means were reported, as they provide the greatest utility in mini‐rhizotron experiments evaluating root growth (Merrill and Upchurch, 1994).…”

Section: Methodsmentioning

confidence: 99%

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Soil Type and Rooting Depth Affect Hybrid Bermudagrass Injury with Preemergence Herbicides

et al. 2013

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Applications of preemergence (PRE) herbicides can injure hybrid bermudagrass [C. dactylon (L.) Pers. × C. transvaalensis Burtt‐Davy]. Research was conducted to determine the effects of soil texture and rooting depth on hybrid bermudagrass injury with two PRE herbicides. Washed ‘Tifway’ hybrid bermudagrass sod was established in mini‐rhizotrons. Treatments included the factorial combination of two soils (sand, silt loam), four herbicides (indaziflam at 35, 52.5, and 70 g ha−1 and prodiamine at 840 g ha−1), and three rooting depths (5, 10, and 15 cm). Averaged across both soils, foliar injury and reductions in root‐length density were greatest at rooting depths ≤15 cm. In a sand rootzone with no organic matter, significant foliar injury (23 to 48%) was observed with indaziflam; however, foliar injury with prodiamine measured ≤7%. In the silt loam rootzone, injury measured 0 to 17% with all herbicides. Data indicate that soil type and rooting depth affect hybrid bermudagrass injury with indaziflam; however, additional research is needed to determine if these glasshouse responses will be similar under field conditions. Differential effects on root function, as well as soil biological, chemical, and physical properties may also affect injury potential with indaziflam and prodiamine applications in sand rootzones. Additional research is needed to explore the effects of indaziflam and prodiamine on hybrid bermudagrass root physiological function in further detail.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Soil Type and Rooting Depth Affect Hybrid Bermudagrass Injury with Preemergence Herbicides

et al. 2013

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“…A seed dressing containing fluoxastrobin did not alter shoot or leaf formation of barley ( Hordeum vulgare L.), but slightly stimulated root growth in varying environmental conditions (Gortz et al, 2008). Brosnan et al (2010) reported that applications of pyraclostrobin increased total root length by approximately 17% in Penn A‐1 creeping bentgrass when exposed to deep and infrequent irrigation in greenhouse conditions. Brosnan et al (2010) suggested that strobilurin‐treated turfgrass plants displayed a response similar to what would be expected following treatment with low doses of auxin, a plant growth hormone known to promote adventitious rooting.…”

mentioning

confidence: 99%

“…Brosnan et al (2010) reported that applications of pyraclostrobin increased total root length by approximately 17% in Penn A‐1 creeping bentgrass when exposed to deep and infrequent irrigation in greenhouse conditions. Brosnan et al (2010) suggested that strobilurin‐treated turfgrass plants displayed a response similar to what would be expected following treatment with low doses of auxin, a plant growth hormone known to promote adventitious rooting. Despite these responses, turfgrass quality was never statistically different among treatments and the researchers suggested that effects of strobilurin fungicide applications on root growth should be evaluated in the field.…”

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confidence: 99%

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

et al. 2016

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Previous research has indicated that strobilurin fungicide applications may mitigate the effects of summer heat stress on creeping bentgrass (Agrostis stolonifera L.). Two multi‐year experiments were conducted in 2011 and 2012 to evaluate plant health characteristics following strobilurin fungicide applications to creeping bentgrass putting greens. In Exp. 1, pyraclostrobin, azoxystrobin, fluoxastrobin, or trifloxystrobin were integrated within a conventional summer fungicide program. In Exp. 2, repeated applications of strobilurin fungicides were evaluated in absence of visible foliar disease. To limit foliar disease, overspray applications of chlorothalonil (2,4,5,6‐tetrachloroisophthalonitrile) and iprodione [3‐(3,5‐dichlorophenyl)‐N‐isopropyl‐2,4‐dioxoimidazolidine‐1‐carboxamide] were applied over the experimental units. The plant health characteristics evaluated were visual quality, spectral reflectance, percent green cover, and root morphology. Disease incidence and severity was also quantified visually. In Exp. 1, the nontreated control was similar to strobilurin fungicide programs in all parameters in 2011. In 2012, strobilurin fungicide programs exhibited improved normalized difference vegetation index (NDVI), ratio vegetation index (RVI), turfgrass quality, and percent green cover compared to the nontreated control. Disease severity also increased in 2012 compared to 2011. In Exp. 2, repeated applications of strobilurin fungicides did not affect measured parameters compared to the nontreated control when foliar diseases were managed with fungicides chlorothalonil and iprodione. In these experiments, differences in NDVI, RVI, turfgrass quality, and percent green cover often coincided with differences in disease severity in our evaluations. Under the conditions of these studies, applications of strobilurin fungicides have limited effects on NDVI, RVI, turfgrass quality, and percent green cover in the absence of visible disease.

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Kentucky bluegrass and bermudagrass rooting response to humic fertilizers during greenhouse establishment

2020

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Greenhouse research was conducted to examine effects of adding humic products to fertilizers on turfgrass. The objective of this study was to determine if the addition of humic products to fertilizers will increase turfgrass root and shoot morphological parameters. Kentucky bluegrass (KBG; Poa pratensis L.) and bermudagrass [Cynodon dactylon (L.) Pers.] were established in sand-filled tubes. Treatments included synthetic fertilizer with black gypsum (22N-0P-3.3K, 30% gypsum and 4.7% humic acid), polymer-coated humic-coated urea (PCHCU; 2% humic acid), urea with humic dispersing granules (HDG; 70% humic acid), starter fertilizer (18N-10.5P-10K) with HDG, starter fertilizer, stabilized nitrogen, urea, and a control group. Fertilizers were applied at 48.8 kg N ha −1 and HDG was applied at 44.4 kg ha −1. Starter fertilizer and starter fertilizer with HDG increased KBG total root length (105 and 112%), root biomass (232 and 244%), and shoot biomass (205 and 204%) compared with urea. In KBG, PCHCU and urea with HDG increased total root length (37 and 20%) compared with urea. In bermudagrass, starter fertilizer and starter fertilizer with HDG increased total root length (241 and 248%), root biomass (672 and 707%), and shoot biomass (821 and 808%) relative to urea. Besides treatments with starter fertilizer, no treatments were different from urea for bermudagrass. These results suggest that starter fertilizer application is critical to turfgrass rooting at establishment. Adding humic products to the starter fertilizer did not increase rooting. In the absence of a starter fertilizer, PCHCU and urea with HDG improved KBG total root length compared with urea.

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Greenhouse Investigation of Strobilurin Fungicide Applications on Creeping Bentgrass Root Characteristics under Two Irrigation Regimes

Cited by 11 publications

References 19 publications

Soil Type and Rooting Depth Affect Hybrid Bermudagrass Injury with Preemergence Herbicides

Soil Type and Rooting Depth Affect Hybrid Bermudagrass Injury with Preemergence Herbicides

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

Kentucky bluegrass and bermudagrass rooting response to humic fertilizers during greenhouse establishment

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