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Superintendent
David Davis
21262 Genoa Road
Linneus, MO 64653
Phone: 660 895-5121
FAX: 660 895=5122
Email:
DavisDK@missouri.edu
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October 1, 2002
Forage Systems Update
Vol 11, No. 4
Field Notes from Valerie Tate
Grass Seed Head Suppression with Clethodim (Select) Herbicide
During the spring of 2002 the Forage Systems Research Center
conducted a grass seed head suppression demonstration. Keep in mind
that this was only a demonstration and not a replicated study;
therefore this is a report of the effect seen on one site, one year,
not a scientific based recommendation. Trials have been conducted at
other sites across the state with similar results.
Clethodim herbicide was applied as the fescue began to green up
during the spring. The table below lists the date and rate of
herbicide application and the percent of green fescue that was
present at the time of application. The site was then monitored
through the spring for seed head emergence. The table below lists
the percent of the stand with seed heads present at the date listed
(Table 1). Forage samples were harvested on June 06, 2002 to
determine yield and forage quality (Table 2).
Table 1. Clethodim herbicide application date and rate and effect on seedhead emergence.
| Site | Date | Green Up | Rate | ------ seed head emergence (%) ------ |
| | (%) | (oz) | 5/17/02 | 5/28/02 | 6/04/02 |
| 1 | 3/11/02 | 10 | 2 | 0 | 70 | 100 |
| 2 | 3/18/02 | 23 | 2 | 0 | 70 | 100 |
| 3 | 4/02/02 | 23 | 2 | 0 | 40 | 80 |
| 4 | 4/12/02 | 37 | 2 | 0 | 0 | 10 |
| 5 | 4/17/02 | 80 | 1.5 | 0 | 0 | 0 |
| Control | No herbicide applied | | 40 | 100 | 100 |
Table 2. Forage Quality and Yield.
| Site | Yield | DM | Crude Protein | ADF | NDF |
| | (lb/A) | (%) | (%) | (%) | (%) |
| 1 | 3131 | 31 | 11.5 | 46.1 | 72.0 |
| 2 | 2835 | 32 | 12.2 | 43.8 | 69.4 |
| 3 | 2040 | 35 | 15.0 | 41.2 | 67.0 |
| 4 | 1820 | 24 | 19.8 | 35.5 | 57.7 |
| 5 | 1311 | 30 | 19.0 | 38.3 | 66.2 |
| C | 3263 | 32 | 11.6 | 45.8 | 68.4 |
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