| |
| Web URL(s): | http://www.newss.org/proceedings/proceedings_1985_vol39.pdf#page=268
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
|---|
| Publication Type:
| Report |
|---|
| Author(s): | Jagschitz, John A. |
|---|
| Author Affiliation: | Department of Plant Science, University of Rhode Island |
|---|
| Title: | Mefluidide timing for Poa annua L. seedhead suppression |
|---|
| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 39, 1985, p. 268-269. |
|---|
| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
|---|
| Keywords: | TIC Keywords: Poa annua; Seedhead inhibition; Mefluidide; Mowing; Maleic hydrazide; Amidochlor
|
|---|
| Trade Names: | MH |
|---|
| Abstract/Contents: | Mefluidide is used to suppress the unsightly seedheads of Poa annua L. (annual bluegrass) which develop profusely in the spring in turfgrass areas. Tests were initiated in a lawn and golf course fairway in 1984 to determine optimum rates and timing (see Table 1). Materials were applied to replicated plots as sprays using 75 gallons of water per acre. No rain followed treatment for at least 20 hours. The lawn was mowed at a 2-inch height weekly while the fairway was mowed at a .75-inch height two or three times weekly. Visual estimates of Poa annua injury and seedhead stand were recorded weekly. Untreated turf had less than 10 seedheads/sq ft by April 10. There were 89, 188 and 365 by April 16, April 26 and May 2, respectively. The numbers of seedheads peaked, up to 686/sq ft, on May 16 and decreased to less than 100 after June 5. Seedheads were objectionable in appearance from May 9 to June 5 (4-week period). This occurred when the number of opened seedheads exceeded about 140/sq ft and reached the mowing height. The results in Table 1 indicate that April 26 was the optimum application date for the .125 lb ai/Acre rate of mefluidide to reduce the Poa annua seedhead stand to a level where it was not objectionable. Treatments pplied furthest from April 26 were the least effective. Adding an adjuvant (Citowett Plus) to the .063 and .125 lb rates extended the optimum date to include April 17 along with April 26. Possibly earlier dates using an adjuvant would also be successful. The .063 lb rate of mefluidide, without adjuvant, did not satisfactorily suppress seadheads, however two applications (3-week interval) was successful when the initial date was April 26. Two applications of mefluidide at .125 lb rate extended the initial optimum application date to include April 10 along with April 17 and 26. On April 26 there were up to 188 seedheads/sq ft and they were not opened and were less than .75 inches in length. Since treatments on April 26 were successful one might assume that suppression can be attained at this stage of development. Some mefluidide treatments, especially those at the .125 lb rate, caused temporary (1-2 weeks) objectionable Poa annua injury 3 to 5 weeks after application. However, this could be less objectionable than that of having the seedheads. There was an increase in Poa annua injury with adjuvant use, but it was not objectionable at the mefluidide .063 lb rate. Two applications may increase the potential for injury. Amidochlor and MH, two other plant growth regulators, were evaluated in these tests, but were only applied on April 17. MH at the 2 lb. rate appeared promising while Amidochlor at the 2 lb rate was ineffective. |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | Tables |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jagschitz, J. A. 1985. Mefluidide timing for Poa annua L. seedhead suppression. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 39:p. 268-269. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=6887 |
| If there are problems with this record, send us feedback about record 6887. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://www.newss.org/proceedings/proceedings_1985_vol39.pdf#page=268
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 |
| Find from within TIC:
Digitally in TIC by file name: newss1985 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
