Fall Applications of Mesotrione For Annual Bluegrass Control in Kentucky Bluegrass

Reicher, Zachary J.; Weisenberger, Daniel V.; Morton, Debbie E.; Branham, B. E.; Sharp, William C.

doi:10.1094/ats-2011-0325-01-rs

Cited by 15 publications

(34 citation statements)

References 20 publications

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“…Kentucky bluegrass has superior tolerance to mesotrione compared to annual bluegrass, and treatments did not inhibit tillering from the nontreated at any growth stage. These results support previous observations on the differential tolerance levels of annual bluegrass to mesotrione at various stages of maturity in field experiments (Reicher et al 2011;Skelton et al 2012). POST applications of mesotrione at 140 and 210 g ha À1 applied 4 wk after emergence did not reduce Kentucky bluegrass cover from the nontreated (Venner 2011).…”

Section: Resultssupporting

confidence: 92%

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Primisulfuron-Methyl Efficacy and Fate in Annual Bluegrass (Poa annua) and Kentucky Bluegrass

McCullough¹,

Singh²,

Czarnota³

et al. 2015

Weed sci.

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Annual bluegrass is a problematic weed of Kentucky bluegrass turf that can be selectively controlled with POST applications of primisulfuron-methyl. The objective of this research was to evaluate physiological behavior of primisulfuron-methyl attributed to selectivity in these species. In application placement experiments, annual bluegrass shoot weight reductions from the nontreated from high to low were treatments including: foliar + soil ≥ soil only ≥ foliar. Annual bluegrass averaged 33 and 52% shoot weight reductions from the nontreated after 4 wk from primisulfuron-methyl at 40 and 80 g ha−1, respectively. Kentucky bluegrass shoot weight was not reduced from the nontreated, and application placements were similar. From five harvests ranging 1 to 168 h after treatment (HAT), annual and Kentucky bluegrass absorbed up to 25 and 32% of foliar applied14C-primisulfuron-methyl, respectively. Both grasses distributed 15% of foliar absorbed14C to nontreated shoots with minimal translocation (≤ 2%) to roots after 168 h. Annual bluegrass translocated 2 times more root-absorbed14C to shoots than Kentucky bluegrass at 24, 72, and 168 HAT. From foliar uptake, the time required for annual and Kentucky bluegrass to degrade 50% of the absorbed herbicide to the major metabolite detected (Rf0.1) measured > 168 and 93 h, respectively. In root metabolism experiments, annual bluegrass had ≈ 3 times and 2 times more primisulfuron acid in roots and shoots, respectively, than Kentucky bluegrass at 24, 72, and 168 HAT. The isolated acetolactate synthase (ALS) enzymes from the two grasses were equally susceptible to inhibition by primisulfuron-methyl. Overall, selectivity of primisulfuron-methyl for annual bluegrass control in Kentucky bluegrass is attributed to differential translocation and metabolism between species.

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Section: Resultssupporting

confidence: 92%

“…Multiple applications of mesotrione in the fall provided inconsistent levels of annual bluegrass control across locations and years (Reicher et al 2011). Skelton et al (2012) also reported erratic control following mesotrione at 110 or 186 g ha À1 applied POST five and three times in Kentucky bluegrass, respectively.…”

mentioning

confidence: 99%

Primisulfuron-Methyl Efficacy and Fate in Annual Bluegrass (Poa annua) and Kentucky Bluegrass

McCullough¹,

Singh²,

Czarnota³

et al. 2015

Weed sci.

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“…Though mesotrione is not specifically labeled for postemergence control of ABG, it is labeled for preemergence suppression of ABG and for use on KBG fairways (Anonymous, 2011). Work in Indiana and Illinois indicates that optimum ABG control in the fall results from three applications of mesotrione at 3.0 or 5.0 oz/ac/application at 14‐day intervals, starting in mid‐ to late September (Reicher et al, 2011). Three fall applications of ethofumesate has been the standard for controlling ABG in KBG and/or PRYE fairways (Adams, 1989; Lewis and DiPaola, 1989; Johnson et al, 1989; Shearman, 1986; Dernoeden and Turner 1988).…”

Section: Useful Conversionsmentioning

confidence: 99%

Herbicide Programs for Annual Bluegrass (Poa annua L.) Control in Nebraska

Reicher

Sousek

Giese

2017

Crop Forage & Turfgrass Mgmt

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Core Ideas Research done on annual bluegrass (ABG) control in other areas of the US are likely applicable to Nebraska. However, extreme weather can dramatically affect short‐term annual bluegrass cover and emphasize the need for long‐term control studies. Three fall POST applications of mesotrione plus prodiamine applied preemergence in August and/or November were effective for ABG control in Kentucky bluegrass fairways. Replacing mesotrione with ethofumesate was also effective when combined with prodiamine in August and November. June applications of bispyribac‐sodium at 4 oz/ac was highly effective for controlling ABG in creeping bentgrass fairways, and adding two more fall applications at the same rate improved control slightly, but there was no benefit to raising the rate to 6 oz/ac. Annual bluegrass (Poa annua L.) (ABG) is common in golf courses, and its control has been thoroughly researched in cool‐season turf east of the Mississippi River in the United States. However, ABG response to herbicides varies widely among environments and/or biotypes, and little ABG control research has been done in the northern Great Plains. Therefore, our objective was to validate ABG herbicide control systems in golf course fairways of Kentucky bluegrass (Poa pratensis L.) (KBG) or creeping bentgrass (Agrostis stolonifera L.) (CBG) in Nebraska. Preemergence (PRE) treatments of prodiamine or mesotrione were applied in late summer over 3 yr with or without fall postemergence (POST) treatments of mesotrione or ethofumesate for ABG control in a low‐mow KBG fairway. We also evaluated rate and frequency of bispyribac‐sodium applications with or without a late summer–applied PRE (dithiopyr) in early September for ABG control over 3 yr in a CBG fairway. Our research indicates that ABG control work done in other areas are likely applicable to Nebraska. Three fall POST applications of mesotrione plus prodiamine applied as a PRE in August and/or November was effective for ABG control in KBG fairways. Replacing mesotrione with ethofumesate was also effective when combined with prodiamine in August and November. June applications of bispyribac‐sodium at 4 oz/ac were highly effective for controlling ABG in CBG fairways, and adding two more fall applications at the same rate improved control slightly, but there was no benefit to raising the rate to 6 oz/ac. Lastly, extreme weather in one summer and one winter dramatically affected short‐term ABG cover and emphasized the need for long‐term control studies in areas with dramatic weather cycles.

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“…Under highly maintained turf settings, ABG converts to a perennial life cycle over time requiring the use of a postemergence herbicide application for eradication (Branham et al, 2010). The selective control of ABG in cool-season turf, especially kentucky bluegrass (Poa pratensis L.), can be challenging as a result of limited herbicide options (Reicher et al, 2011).…”

mentioning

confidence: 99%

Postemergence Control of Annual Bluegrass with Mesotrione in Kentucky Bluegrass

Skelton¹,

Sharp²,

Branham³

2012

horts

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Six field trials were conducted in 2009 and 2010 to study postemergence control of annual bluegrass (Poa annua L. var. Hausskn Timm) in kentucky bluegrass (Poa pratensis L.) with mesotrione. Mesotrione was applied at 11 different rate and application intervals to an area of kentucky bluegrass that was naturally infested with annual bluegrass. Mesotrione rates of 56 g·ha−1 applied two or three times per week for a total of 10 applications or 84 g·ha−1 applied two times per week for a total of seven applications provided consistent control of annual bluegrass but required significant application labor and resulted in minor kentucky bluegrass injury. Other treatments that required fewer applications, 110 g·ha−1 applied twice per week for five applications or 186 g·ha−1 per week for three applications, also achieved high levels of control under high air temperatures, but control levels can vary significantly as temperatures fluctuate and seasons change. Mesotrione can successfully control annual bluegrass in kentucky bluegrass when frequent applications at low rates are applied or when environmental conditions are conducive to control.

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Fall Applications of Mesotrione For Annual Bluegrass Control in Kentucky Bluegrass

Cited by 15 publications

References 20 publications

Primisulfuron-Methyl Efficacy and Fate in Annual Bluegrass (Poa annua) and Kentucky Bluegrass

Primisulfuron-Methyl Efficacy and Fate in Annual Bluegrass (Poa annua) and Kentucky Bluegrass

Herbicide Programs for Annual Bluegrass (Poa annua L.) Control in Nebraska

Postemergence Control of Annual Bluegrass with Mesotrione in Kentucky Bluegrass

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