| |
| Web URL(s): | https://neppsc.org/wp-content/uploads/2019-NEPPSC-Proceedings-FINAL.pdf#page=44
Last checked: 07/18/2019
Requires: PDF Reader
Notes: Item is within a single large file
https://www.newss.org/wp-content/uploads/2019-NEWSS-Proceedings-FINAL.pdf#page=71
Last checked: 06/23/2023
Requires: PDF Reader
Notes: Item is within a single large file; Proceedings of the Seventy-third Annual Meeting of the Northeastern Weed Science Society reprint |
|---|
| Publication Type:
| Proceedings |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | Askew, S.D.;
Brewer, J. |
|---|
| Author Affiliation: | Virginia Tech, Blacksburg, VA |
|---|
| Title: | Temperatures during and after treatment affect zoysiagrass response to glyphosate glufosinate |
|---|
| Meeting Info.: | Hunt Valley, Maryland: January 8-10, 2019 |
|---|
| Source: | Proceedings of the Fourth Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. Vol. 4, 2019, p. 34. |
|---|
| Publishing Information: | s.l.: Northeastern Weed Science Society; Northeastern Regional Branch of the American Society of Agronomy, Crop Science Society of America, & Soil Science Society of America; and American Society of Horticultural Science - Northeastern Division |
|---|
| # of Pages: | 1 |
|---|
| Keywords: | TIC Keywords: Dormancy; Glufosinate; Glyphosate; Non-selective herbicides; Temperature response; Weed control; Zoysia
|
|---|
| Abstract/Contents: | "Turf managers typically exploit winter dormancy of warm-season grasses (e.g., bermudagrass, Cynodon spp.) to utilize non-selective herbicides. Glyphosate and glufosinate are labeled for use in dormant zoysiagrass but turf specialist rarely recommend this practice for fear that zoysiagrass may not be "completely dormant." Research has shown that air temperatures can affect weed control and crop safety from herbicides and we hypothesized this to be the case with zoysiagrass. However, no research has examined the impact of temperature during or after non-selective herbicide applications on zoysiagrass response during spring green-up. The objective of this research was to determine the influence of three different temperature regimes during and after application on zoysiagrass response to glyphosate and glufosinate. A randomized complete block study was initiated that included 6 replications in time. Treatments included a split plot arrangement of 3 temperature main plots and a 2 (herbicides) x 3 (rates) factorial arrangement of subplots. Dormant 'Meyer' zoysiagrass plugs were greenhouse incubated for 48 hours on March 6, 2018. The plugs were dissected and five, 5-cm sprigs that exhibited early development of green foliage were placed in petri dishes on moist paper discs. Petri-dishes were then placed into three growth chambers set to constant 10°, 18° , and 27° C. After 12 hours, petri-dishes were removed from growth chambers and over sprayed with glyphosate at 75, 350, or 700 g ai ha or glufosinate at 420, 840, or 1680 g ai ha then returned to chambers. A nontreated check was included in each temperature regime. Seven days after treatment (DAT), petri-dishes were moved to a green house at 27° C and incubated an additional 14 days. During incubation, zoysiagrass green cover was assessed 11 times via aerial digital images that were analyzed to enumerate green pixels. At 21 DAT, sprigs were dried for 48 hours and weighed. Detected green pixels of treated sprigs were converted to a percentage reduction relative to nontreated sprigs for each temperature by replicate combination. Percent reduction in green pixel count over time was subjected to hyperbolic or sigmoidal nonlinear regression to determine the number of days required to reduce growth by 50% (GR50). A unique GR50 value was determined for each experimental unit and these data were subjected to ANOVA and Fisher's Protected LSD separation. Dry biomass of sprigs was subjected to similar ANOVA and mean separation. Data indicated that zoysiagrass sprigs treated with glufosinate reduced GR50 more rapidly than glyphosate regardless of rate. Zoysiagrass incubated for 7 days at 10° C required 9 days to reach a herbicide-induced GR50 and significantly more time than zoysiagrass incubated at 18° C and 26° C. Glufosinate reduced 26° C incubated zoysiagrass growth by 50% in less than one day and faster than other treatments. Glyphosate had essentially no influence on 10° C incubated zoysiagrass growth until after sprigs had been moved to higher temperatures 7 DAT and GR50 values typically ranged between 7 and 11 days. Results indicate as temperatures increase the rate of glyphosate and glufosinate activity increases. These data suggest that glyphosate activity on zoysiagrass is considerably more temperature dependent than that of glufosinate." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | This item is an abstract only!
Reprint appears in Proceedings of the Seventy-third Annual Meeting of the Northeastern Weed Science Society 2019, Vol. 73, p. 46 |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S.D., and J. Brewer. 2019. Temperatures during and after treatment affect zoysiagrass response to glyphosate glufosinate. p. 34. In Proceedings of the Fourth Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. Hunt Valley, Maryland: January 8-10, 2019. s.l.: Northeastern Weed Science Society; Northeastern Regional Branch of the American Society of Agronomy, Crop Science Society of America, & Soil Science Society of America; and American Society of Horticultural Science - Northeastern Division. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=306910 |
| If there are problems with this record, send us feedback about record 306910. |
| Choices for finding the above item: |
|---|
| Web URL(s):
https://neppsc.org/wp-content/uploads/2019-NEPPSC-Proceedings-FINAL.pdf#page=44
Last checked: 07/18/2019
Requires: PDF Reader
Notes: Item is within a single large file
https://www.newss.org/wp-content/uploads/2019-NEWSS-Proceedings-FINAL.pdf#page=71
Last checked: 06/23/2023
Requires: PDF Reader
Notes: Item is within a single large file; Proceedings of the Seventy-third Annual Meeting of the Northeastern Weed Science Society reprint |
| Find from within TIC:
Digitally in TIC by file name: nppsc2019 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
