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| Web URL(s): | https://listings.lib.msu.edu/nwtgc/1988.pdf#page=96
Last checked: 01/17/2017
Requires: PDF Reader |
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| Publication Type:
| Proceedings |
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| Author(s): | Brede, A. Douglas;
Dunfield, Joe |
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| Author Affiliation: | Research Director; Research Associate, Jacklin Seed Company |
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| Title: | Seeding rate: Its effect on disease and weed encroachment |
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| Meeting Info.: | September 19-22, 1988 |
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| Source: | Proceedings of the 42nd Northwest Turfgrass Conference. Vol. 42, December 1988, p. 90-97. |
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| Publishing Information: | Spokane, WA: Northwest Turfgrass Association |
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| Keywords: | TIC Keywords: Diseases; Fusarium culmorum; Drechslera; Disease susceptibility; Weed competition; Seeding rate; Glyphosate; Weed control; Shoot density
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| Abstract/Contents: | There are occasions when the seeding rate used might differ from the standard seeding rates. In the case of a sod grower, weeds were not a problem, so he was able to seed at a lower than recommended rate (bluegrass seed at 0.5 lbs./1000 sq ft), wait longer for the sod to increase to a sufficient density, and spend less on seed. In another case, a golf course superintendent was plagued with high amounts of annual bluegrass on a fairway. He tried to kill off the fairway in the past with glyphosate, and overseed it with an improved species, only to find another mixed stand after emergence. He increased the seeding rate of Kentucky bluegrass up to 4 lbs/1000 sq ft. This allows for effective competition against the annual bluegrass for several years after establishment. A study was undertaken in 1976 to investigate the effects of seeding rate on the maturation of a turf stand and development of weeds and diseases. Kentucky bluegrass was seeded at four different rates. Shoot density was periodically sampled. After 41 months, there were significant differences in shoot density among the four different rates. It wasn't until five years after the trials began that differences in shoot density were undetectable. Certain plots in the experiment were treated with preventative fungicides. Very high tiller densities were preserved for longer periods of time than where fungicides were not used. High tiller densities are predisposed to turf disease. Higher seeding rates with lower cutting heights were found desirable in order to maintain 100 percent coverage. Research indicated that seeding rate should be doubled for every halving of cutting height. For instance, while one pound might be acceptable for a 3" cut, a two pound rate might be better for a 1.5" cut, and a four pound rate for a 0.75" cutting height. This provides the desired shoot density without the usual "equilibration" period. Effect of Kentucky bluegrass seeding rate on encroachment of annual bluegrass is quite profound. A low seeding rate will allow the invasion of annual bluegrass. It could happen sooner or later. Seeding rates of 3-4 lbs/1000 sq ft were desirable where annual bluegrass seed was prevalent in the soil. Vigorous cultivars were better for competing against annual bluegrass. Seeding too heavily may increase disease problems. Incidence of leafspot and Fusarium blight complex was directly related to seeding rates. Seeding rates above 3.5 lbs/1000 sq ft greatly increased the risk of disease during the establishment phase. When a dense stand was hit by the disease, the shoot density was lowered, and the stand subsequently had less disease. Recommended seeding rate for Kentucky bluegrass is 2-3 lbs/1000 sq ft; perennial ryegrass 4-8 lbs/1000 sq ft, and tall fescue 6-10 lbs/1000 sq ft. Graphs: Seeds per lb vs. bluegrass, ryegrass, and fescue varieties. Kentucky bluegrass seeding rate PLS/ft2 vs. estimated poa annua percentage vs. dollar spots/ft2. Poa annua seeding rate PLS/dm2 vs estimated poa annua (cultivars: A-34, Baron, Bonnieblue, Newport, Pennstar) percentage. Seeding rate vs disease incidence (galera, fusarium, helminthosporium, fusarium roseum). |
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| Language: | English |
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| References: | 0 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brede, A. D., and J. Dunfield. 1988. Seeding rate: Its effect on disease and weed encroachment. p. 90-97. In Proceedings of the 42nd Northwest Turfgrass Conference. September 19-22, 1988. Spokane, WA: Northwest Turfgrass Association. |
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| Web URL(s):
https://listings.lib.msu.edu/nwtgc/1988.pdf#page=96
Last checked: 01/17/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .N6 no. 42 |
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