Response of Young Pecan Trees to Repeated Applications of Indaziflam and Halosulfuron

Grey, Timothy L.; Rucker, Keith; Wells, Lance; Luo, Xuelin

doi:10.21273/hortsci12588-17

Cited by 6 publications

(8 citation statements)

References 23 publications

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“…This indicates the crop safety if a POST application of indaziflam after an initial harvest is needed to extend residual weed control. This is similar to other crop scenarios where indaziflam has been applied as split applications during the season (Grey et al 2016(Grey et al , 2018. At harvest 3, 154 to 167 DAT, there were no differences in yield for any herbicide treatments for fresh-or dry-weight biomass.…”

Section: Harvest Datasupporting

confidence: 81%

Bermudagrass tolerance of indaziflam PRE applications in forage production

et al. 2019

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Bermudagrass is a major forage species throughout Georgia and the Southeast. An essential part of achieving high-yielding, top-quality forages is proper weed control. Indaziflam is a residual herbicide that controls many broadleaf and grass species by inhibiting cellulose biosynthesis. Research conducted in Tift and Colquitt counties in Georgia determined optimal PRE rates for indaziflam for bermudagrass forage production. Treatments applied at spring greenup of established ‘Alicia’ bermudagrass included indaziflam at 47, 77, 155, or 234 g ai ha−1 PRE, pendimethalin at 4,480 g ha−1 PRE, a split application of indaziflam at 47 g ha−1 PRE followed by the same rate applied POST after the first cutting, and a nontreated control (seven treatments in all). Forages were machine harvested three times each year for each location beginning at least 47 d after treatment (DAT), with final cuttings up to 168 DAT. For all treatments, fresh- and dry-weight yields at each harvest and totals for the season did not differ from the nontreated control. Indaziflam at 155 and 234 g ha−1 did cause minor stunting at 44 DAT, but this was transient and not observed at the second harvest. Indaziflam applied PRE has the potential to provide residual control of troublesome weeds in bermudagrass forage and hay production, with ephemeral stunting at the recommended application rates.

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Section: Harvest Datasupporting

confidence: 81%

Bermudagrass tolerance of indaziflam PRE applications in forage production

et al. 2019

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“…At the end of this greenhouse study, no phytotoxicity effects on young pecan trees were observed when indaziflam and its breakdown products where present in the soil. Similar results were reported by Grey et al (2018) after exposing young pecan trees to multiple applications of indaziflam. However, studies on the mobility, degradation, and toxicity of indaziflam and indaziflam breakdown products should be conducted under different scenarios because there is limited published information available.…”

Section: Sand (%)supporting

confidence: 88%

Mobility, Degradation, and Uptake of Indaziflam under Greenhouse Conditions

González-Delgado¹,

Shukla²

2020

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The objectives of this study were to evaluate the leaching, degradation, uptake, and mass balance of indaziflam, as well as its potential to produce phytotoxicity effects on young pecan trees. Pecan trees were planted in pots with homogeneous porous media (sandy loam soil), preferential flow channels open to the soil surface, and shallow tillage at the soil surface. Pots were treated with indaziflam at two application rates of 25 and 50 g a.i./ha in 2014 and 2015. Each pecan tree was irrigated with 7 L of water every 2 weeks during the growing season. An irrigation volume of 2 L was used to maximize indaziflam retention time in the soil from Dec. 2015 until the end of the trees’ dormant stage. In 2014, leachate samples were collected after each irrigation for quantifying indaziflam mobility. Soil samples were collected at depths of 0 to 12 and 12 to 24 cm after 45, 90, and 135 days of indaziflam application, and leaf samples were collected at the end of the growing season to quantify mobility and uptake. Indaziflam was detected in leachate samples, and the leaf indaziflam content increased with increasing application rate. Indaziflam and its breakdown products were detected at both sampling depths. Mass recovery and half-life values for indaziflam in the soil ranged from 38% to 68% and 63 to 99 days, respectively. No phytotoxicity effects were observed from increasing application rate and retention time of indaziflam in the soil. Most of the applied indaziflam was retained in the soil at shallow depth.

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“…This was always transient and no longer noted 8 wk after treatment. Many reports of little to no visual injury have been made for indaziflam applied to perennial crops (Basinger et al 2019;González-Delgado et al 2017;Grey et al 2018Grey et al , 2016Hurdle et al 2019).…”

Section: Blueberrymentioning

confidence: 99%

“…As a PRE herbicide, it is used in numerous crop settings and has shown to be safe to perennial crops including grapes (Vitis vinifera L.; Basinger et al 2019), olive (Olea europaea L.; Grey et al 2016), pecan (Carya Illinoinensis Wangenh. ; Grey et al 2018), bermudagrass forage (Cynodon dactylon L.; Hurdle et al 2019), turf (McCullough et al 2013, and citrus (Jhala et al 2013). These studies indicate that indaziflam is safe to use in numerous crop settings, but minimal information exists for its use on blueberry and blackberry.…”

Section: Introductionmentioning

confidence: 99%

“…Indaziflam provides an extended period of weed control in these systems due to a half-life that is greater than 150 d, allowing for season-long weed control (Shaner 2014). Grey et al (2016Grey et al ( , 2018 reported that rates of indaziflam up to 150 g ai ha −1 did not cause injury when applied to olive and pecan trees, when up to five applications were made over 3 yr (respectively). It was also reported that indaziflam applied at 234 g ai ha −1 in a bermudagrass forage setting had minimal chlorosis and no effect on yield compared with nontreated controls (Hurdle et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Blueberry and blackberry are tolerant to repeated indaziflam applications

et al. 2021

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Numerous perennial horticultural crops are grown across the southeastern US. Blueberry and blackberry (also known as caneberry) are commonly found in roadside stands, promote agritourism with the pick your own markets, are important for fresh market commercial production in the region, and when processed, provide desirable value added products. Season-long weed control using residual herbicides is crucial for these perennial fruit crops to maximize berry quality and yield. Studies performed from 2012 to 2014 in Lanier and Clinch counties in Georgia evaluated the effects of repeated applications of indaziflam at 35, 75, or 145 g ai ha-1 applied biannually in March and September (5 total applications) on growth of ‘Alapaha’ rabbiteye and ‘Palmetto’ highbush blueberry, and ‘Apache’ thornless blackberry. All indaziflam treatments were mixed with glufosinate, and a glufosinate only treatment was included as a check. Minor leaf chlorosis (<10%) was noted within 30 days after application for all blueberries for all treatments, but this was always transient. Blueberry stem diameter was not different for any treatment, even when indaziflam was applied up to 725 g ai ha-1 over three years as compared to glufosinate alone. There was no chlorosis or stem diameter differences for blackberry noted for any treatment. Indaziflam applied in blueberry and blackberry production provides season-long control of numerous troublesome weed species, without causing injury or negatively impacting crop growth.

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Response of Young Pecan Trees to Repeated Applications of Indaziflam and Halosulfuron

Cited by 6 publications

References 23 publications

Bermudagrass tolerance of indaziflam PRE applications in forage production

Bermudagrass tolerance of indaziflam PRE applications in forage production

Mobility, Degradation, and Uptake of Indaziflam under Greenhouse Conditions

Blueberry and blackberry are tolerant to repeated indaziflam applications

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