Full TGIF Record # 324996
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/141431
    Last checked: 01/31/2023
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Ignes, Martin; McCurdy, James D.; Tseng, Te-Ming Paul; Ferguson, Connor; Stewart, Barry R.
Author Affiliation:Ignes: Presenting Author and Mississippi State University; McCurdy, Tseng and Stewart: Mississippi State University; Ferguson: Sesaco Corporation
Title:Effects of spray droplet size on pronamide control of Poa annua
Section:Turfgrass pest management oral I (includes student competition)
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C05 turfgrass science
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Meeting Info.:Baltimore, Maryland: November 6-9, 2022
Source:ASA, CSSA, SSSA International Annual Meeting. 2022, p. 141431.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Annual bluegrass (Poa annua L.) is a troublesome weed in turfgrass systems known for developing resistance to many herbicide sites of action. The mitotic-inhibiting herbicide pronamide has both pre- and post-emergence activity on susceptible annual bluegrass populations. Previous studies suggest that post-emergence activity may be compromised due to lack of root uptake or an unknown foliar resistance mechanism. Research was conducted to quantify the effects of spray droplet size on deposition and efficacy of pronamide, flazasulfuron, and the tank-mixture of pronamide + flazasulfuron on annual bluegrass. Herbicides were applied across five droplet size sprays (200, 400, 600, 800, and 1000 ┬Ám) in an enclosed spray chamber on two-to-three leaf stage annual bluegrass plants. Fluorescent tracer dye was added to each treatment solution to quantify the effects of herbicide and spray droplet size on herbicide deposition. In another experiment, efficacy of 0.5, 1, and 2 x labeled rates combined with droplet size sprays of 400 and 1000 ┬Ám, was assessed on two pronamide-resistant and two pronamide-susceptible annual bluegrass populations. Spray droplet size affected deposition of pronamide and flazasulfuron, applied alone and in combination. Pronamide foliar deposition was highest with the 200 and 400 ┬Ám spray droplet sizes and lowest with the 800 and 1000 ┬Ám droplet sizes. Pronamide efficacy was generally affected by droplet size, with the largest size (1000 ┬Ám) showing improved control. Flazasulfuron efficacy and pronamide + flazasulfuron efficacy were not affected by droplet size. Pronamide + flazasulfuron tank-mixture controlled all four populations more effectively than pronamide alone, regardless of droplet size. Pronamide + flazasulfuron tank-mixture applied with relatively large droplets is recommended for annual bluegrass control. Future research should evaluate other strategies to improve soil deposition, including deposition aids and post-application irrigation."
See Also:See also related article: "Effects of spray droplet size on pronamide control of Poa annua" International Turfgrass Society Research Journal, 14(1), June 2022, p. 1080-1083, R=321556. R=321556
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ignes, M., J. D. McCurdy, T.-M. P. Tseng, C. Ferguson, and B. R. Stewart. 2022. Effects of spray droplet size on pronamide control of Poa annua. Agron. Abr. p. 141431.
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