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| Publication Type:
| Newsletter |
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| Author(s): | Sullivan, Dave;
MacDonald, Leslie |
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| Author Affiliation: | Sullivan: Master Superintendent, Castlegar Golf Club; MacDonald: Plant Pathologist, BC Ministry of Agriculture, Food & Fisheries |
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| Title: | The fall application of potassium to reduce pink snow mold damage to fairways: 1999/2000 and 2000/2001 final report |
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| Column Name: | Research from the past
Other records with the "Research from the past" Column
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| Source: | The Turf Line News. Vol. 195, August/September 2006, p. 12, 14-16. |
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| Publishing Information: | Maple Ridge, British Columbia: Western Canada Turfgrass Association |
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| # of Pages: | 4 |
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| Keywords: | TIC Keywords: Autumn maintenance; Potassium fertilizers; Microdochium patch; Golf fairways; Disease control; Quintozene; Drainage; Disease severity; Application rates; Disease susceptibility; Fall fertilization; Fertilization rates
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| Abstract/Contents: | "The wet, cool spring, lack of frozen ground on the course through the winter, and low soil tempuratures in March and April 2000 contributed to higher disease levels at susceptible locations in comparison to previous years. However, trial results in spring 2000 had a high degree of variability because the experimental design was not set up properly. This made it difficult to draw conclusions. Results in spring 2001 showed that fall potassium application at 1.72lbs K2O/1000 sq.ft. were beneficial in reducing pink snow mold damage. Potassium at this rate had an average of only 6% damage. There was no significant difference in control between the 1.72 lb. rate and the 2.97 lb. rate indicating no advantage to using a higher rate at this golf course. However, the 1.72 lb. rate was significantly better than the 1.15 lb. and 0 lb. rates. These observations suggest that a fall potassium application is an important part of a winter disease management program. The other components of this program include the provision of good drainage on the fairway and over-seeding with well adapted varieties. Drainage minimizes the moisture which the fungus needs for infection. Over-seeding encourages recovery and provides competition for Poa Annua. One application of Quintozene 75WP at 8oz/1000 sq. ft. gave excellent control (0.03% damage) for spring 2001. In this trial, the level of control from the fungicide treatment was not statistically different in comparison to the fall application of 1.72 lbs. K2O/1000 sq.ft. However, one could actually observe that the quintozene treatment did provide better disease control,which was the difference between 6% and .3%. Cost, member feedback and philosphy on fungicide use are the major considerations required in deciding which fairway program to use. Observations in golfer expections suggest that once a golf course starts pursue high quality fairways in the spring through a fungicide treatment, golfers will come to expect high quality each spring. There will likely be tremendous pressure to continue the use of fungicides each year. Fall potassium applications may have a role in reducing pink snow mold damage on middle to lower budget golf courses if used in conjunction with good drainage and over-seeding. However, if quintozene becomes unavailable in the future, there is no ready fungicide substitute that is cost-effective and reliable for fairway applications. Fall potassium use may be revisited by courses previously relying on a fungicide application. There is debate about which nitrogen:potassium ratio is best. The ratio of 1:18 was used for the 1.72 lbs, K2O/1000 sq.ft. treatment. There should be no problem with this rate. The main concern when applying extra potassium is to use caution when base saturation levels of magnesium are low, especially when the soil CEC is low. High levels of potassium may saturate the CEC sites at the expense of other cations such as magnesium. Soil tests are needed to monitor the situation." |
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| Language: | English |
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| References: | 3 |
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| See Also: | Other items relating to: Potassium
Other items relating to: P C N B - Quintozene |
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| Note: | Graphs
"This article is a shortened version of a past wcta research project."
Executive summary as abstract |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sullivan, D., and L. MacDonald. 2006. The fall application of potassium to reduce pink snow mold damage to fairways: 1999/2000 and 2000/2001 final report. Turf Line News. 195:p. 12, 14-16. |
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