Evaluation of flazasulfuron for hair fescue (<i>Festuca filiformis</i>) suppression and wild blueberry (<i>Vaccinium angustifolium</i>Ait.) tolerance

Zhang, Linshan; White, Scott N.; Olson, A. R.; Pruski, Kris

doi:10.1139/cjps-2018-0052

Cited by 14 publications

(47 citation statements)

References 23 publications

(32 reference statements)

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“…Nonbearing year flowering tuft inflorescence number was not reduced by foramsulfuron at Stewiacke either, although seed production was reduced by spring-nonbearing year foramsulfuron applications at this site (Table 5). Spring foramsulfuron applications do not kill established tufts (White and Kumar, 2017) and, as such, generally do not reduce total tuft density (White and Kumar, 2017;Zhang, 2017;Zhang et al, 2018). Reductions in flowering tuft density and flowering tuft inflorescence number are also inconsistent (Zhang et al, 2018), and our results further demonstrate this inconsistency.…”

Section: Resultsmentioning

confidence: 49%

“…Spring foramsulfuron applications do not kill established tufts (White and Kumar, 2017) and, as such, generally do not reduce total tuft density (White and Kumar, 2017;Zhang, 2017;Zhang et al, 2018). Reductions in flowering tuft density and flowering tuft inflorescence number are also inconsistent (Zhang et al, 2018), and our results further demonstrate this inconsistency. Reasons for this inconsistency are unknown, but are likely the result of natural variability in hair fescue tuft size and tiller number in established populations in lowbush blueberry fields (S.N.…”

Section: Resultsmentioning

confidence: 49%

“…Hair fescue (Festuca filiformis) is a common, tufted perennial grass in lowbush blueberry fields. Tufts form dense, competitive sods that can reduce lowbush blueberry yield by >50% (White, 2019;Zhang, 2017;Zhang et al, 2018). Many growers are also unable to harvest fields with hair fescue infestations due to inability of mechanical harvesters to move through dense tufts.…”

mentioning

confidence: 99%

“…Many growers are also unable to harvest fields with hair fescue infestations due to inability of mechanical harvesters to move through dense tufts. Hair fescue is not controlled by preemergence nonbearing year hexazinone applications (White, 2019) and efficacy of preemergence nonbearing year terbacil applications is variable and limited primarily to suppression (White, 2019;Zhang et al, 2018). Postemergence foramsulfuron applications were recently registered for nonbearing year hair fescue suppression in lowbush blueberry and reduce flowering tuft density, flowering tuft inflorescence number, and flowering tuft seed production and seed viability (White and Kumar, 2017).…”

mentioning

confidence: 99%

“…Postemergence foramsulfuron applications were recently registered for nonbearing year hair fescue suppression in lowbush blueberry and reduce flowering tuft density, flowering tuft inflorescence number, and flowering tuft seed production and seed viability (White and Kumar, 2017). However, efficacy is variable across sites and large tufts common in lowbush blueberry fields are not killed (Zhang et al, 2018). There is, therefore, interest from growers to use foramsulfuron as a sequential application in conjunction with other fall-or springapplied herbicides, as this may improve hair fescue suppression (White and Kumar, 2017;White, 2019) and diversify the herbicide modes of action used to manage this weed species.…”

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confidence: 99%

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Fall-bearing Year Herbicides and Spring-nonbearing Year Foramsulfuron Applications for Hair Fescue Management in Lowbush Blueberry

White

Zhang

2020

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Hair fescue (Festuca filiformis) is a tuft-forming perennial grass that reduces yields in lowbush blueberry (Vaccinium angustifolium) fields. Nonbearing year foramsulfuron applications suppress hair fescue, but there is interest in increasing suppression through foramsulfuron use in conjunction with fall-applied herbicides. The objective of this research was to determine the main and interactive effects of fall-bearing year herbicide applications and spring-nonbearing year foramsulfuron applications on hair fescue. The experiment was a 5 × 2 factorial arrangement of fall-bearing year herbicide (none, terbacil, pronamide, glufosinate, dichlobenil) and spring-nonbearing year foramsulfuron application (0, 35 g·ha−1) arranged in a randomized complete block design at lowbush blueberry fields in Portapique and Stewiacke, Nova Scotia, Canada. Spring-nonbearing year foramsulfuron applications did not reduce total tuft density or consistently reduce flowering tuft density, flowering tuft inflorescence number, or flowering tuft seed production. Fall-bearing year pronamide applications reduced hair fescue density for the 2-year production cycle, although additional bearing year density reductions occurred when pronamide was followed by spring-nonbearing year foramsulfuron applications at Stewiacke. Fall-bearing year dichlobenil applications reduced total and flowering tuft density at each site, although reductions in flowering tuft inflorescence number and seed production were most consistent when followed by spring-nonbearing year foramsulfuron applications at Stewiacke. Suppression extended into the bearing year at each site, and dichlobenil should be examined further for hair fescue control. Fall-bearing year glufosinate applications reduced hair fescue total tuft density at each site and flowering tuft density and flowering tuft seed production at Stewiacke. Fall-bearing year glufosinate applications followed by spring-nonbearing year foramsulfuron applications also reduced nonbearing year flowering tuft inflorescence number and bearing year hair fescue seedling density at Stewiacke, indicating that this treatment may reduce hair fescue seedling recruitment at some sites. Fall-bearing year terbacil applications did not suppress hair fescue and are not recommended for hair fescue management in lowbush blueberry.

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Section: Resultsmentioning

confidence: 49%

Section: Resultsmentioning

confidence: 49%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Fall-bearing Year Herbicides and Spring-nonbearing Year Foramsulfuron Applications for Hair Fescue Management in Lowbush Blueberry

White

Zhang

2020

hortte

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Evaluation of dichlobenil for hair fescue (Festuca filiformis Pourr.) management in wild blueberry (Vaccinium angustifolium Ait.)

MacEachern,

Esau,

White

et al. 2024

Agronomy Journal

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Hair fescue is an economically destructive, tuft‐forming weed common in wild blueberry fields. The current management of hair fescue is almost completely reliant on pronamide (3,5‐dichloro‐N‐[2‐methylbut‐3‐yn‐2‐yl]benzamide) herbicide with few other products demonstrating effectiveness. Dichlobenil (2,6‐dichlorobenzonitrile) is a group 29 herbicide registered for use in wild blueberry; however, it has seen limited use because of its high product cost of over CAD 1800 ha−1 and limited research on the effect of varying application rates. Treatments (dichlobenil at 4400, 5700, and 7000 g a.i. ha−1, pronamide at 2240 g a.i. ha−1, and a nontreated control) were applied during the 2020 autumn prior to wild blueberry stem emergence in the nonbearing year (2021). Each treatment was replicated five times per field across three fields in central Nova Scotia. Dichlobenil at 4400, 5700, and 7000 g a.i. ha−1 reduced 2021 (nonbearing year) living tuft density by 59%, 71%, and 83%, respectively, and provided residual control in 2022 (bearing year) with densities reduced by 59%, 69%, and 78%, respectively. Comparatively, pronamide reduced 2021 and 2022 living tuft density by 95% and 91%. Reductions in living tuft density resulted in yield increases of 62%, 57%, and 94% in plots treated with dichlobenil at 4400, 5700, and 7000 g a.i. ha−1, respectively, and 73% for plots treated with pronamide. Results demonstrate that dichlobenil is an effective herbicide for managing hair fescue in wild blueberry. The potential for the selection of herbicide‐resistant biotypes to industry standard pronamide could be prolonged with integrated dichlobenil applications.

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Evaluation of broadcast and spot herbicide applications for narrowleaf goldenrod [Euthamia graminifolia (L.) Nutt.] management in lowbush blueberry

et al. 2019

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Goldenrods are common perennial weeds in lowbush blueberry fields in Nova Scotia. Management options are limited to mowing and suppression with POST mesotrione applications. The objectives of this research were to (1) compare efficacy of single versus sequential nonbearing-year POST mesotrione applications on goldenrod (2) identify the optimal interval between sequential POST mesotrione applications (3) evaluate nonbearing-year POST bicyclopyrone applications on goldenrod, and (4) evaluate nonbearing-year summer and fall herbicide spot treatments on goldenrod. POST mesotrione applications at 144 g ai ha−1 caused 39% to 77% injury but did not reduce goldenrod shoot density. In contrast, mesotrione applications at 144 g ai ha−1 followed by sequential mesotrione application at 14, 21, or 28 days after initial treatment caused greater than 90% injury to goldenrod and reduced both nonbearing- and bearing-year shoot density. POST bicyclopyrone applications at 50 g ai ha−1 caused 69% to 80% injury to goldenrod but did not reduce shoot density. A bicyclopyrone plus mesotrione tank mixture did not improve goldenrod control relative to mesotrione or bicyclopyrone alone. Summer spot applications of glyphosate (7.24 g ae L water−1), glufosinate (0.75 g ai L water−1), and mesotrione (0.72 g ai L water−1) consistently injured goldenrod and reduced both nonbearing- and bearing-year shoot density. Summer spot applications of bicyclopyrone (0.25 g ai L water−1), flazasulfuron (0.31 g ai L water−1), dicamba (1 g ae L water−1), dicamba plus diflufenzopyr (0.7 g ae L water−1 plus 0.3 g ai L water−1), triclopyr (1.68 g ai L water−1), clopyralid (0.08 g ai L water−1), tribenuron methyl (0.2 g ai L water−1), and foramsulfuron (0.2 g ai L water−1) injured goldenrod but did not consistently reduce shoot density. When these herbicides were evaluated as fall spot applications, only glyphosate reduced goldenrod shoot density in the year after application.

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Evaluation of flazasulfuron for hair fescue (Festuca filiformis) suppression and wild blueberry (Vaccinium angustifoliumAit.) tolerance

Cited by 14 publications

References 23 publications

Fall-bearing Year Herbicides and Spring-nonbearing Year Foramsulfuron Applications for Hair Fescue Management in Lowbush Blueberry

Fall-bearing Year Herbicides and Spring-nonbearing Year Foramsulfuron Applications for Hair Fescue Management in Lowbush Blueberry

Evaluation of dichlobenil for hair fescue (Festuca filiformis Pourr.) management in wild blueberry (Vaccinium angustifolium Ait.)

Evaluation of broadcast and spot herbicide applications for narrowleaf goldenrod [Euthamia graminifolia (L.) Nutt.] management in lowbush blueberry

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