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Fertilizer Question

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LawnSite Bronze Member
I have a customer that has a tall fescue lawn and every year she gets dollar spot fungus. This year she talked to someone at a nursery and he told her to fertilize in september, october, and november, and winterize in december. Then no more applications until next september. She is sure it will help with the fungus problems.

I have never heard of this type of applications to help with fungus problems.
Has anyone done this type of fertilizing?

What kind of fert do you use for each application?



LawnSite Bronze Member
Georgia Z7
You also need to fertilize in late Winter and Spring in addition to the times mentioned above.

Fescue should get most of its Nitrogen in the Fall, so you can start doing that in September and on until Winter. We also will start fertilizing again in Februrary.

What really does matter is when you stop the last fertilization in the Spring. In our area, April is the last suggested time for Nitrogen fertilization. If you go past that, you are too close to Summer conditions.

You can fertilize with Nitrogen anytime from mid-September to April. During warmer conditions, use a slow release product such as SCU or Nutralene. During cooler conditions, you need more free release Urea such as Ammonium Sulfate. This is because most forms of slow release Nitrogen become largely inactive in cooler soil temperatures.

It also helps to do a high Potassium application in May/June just before the hot weather arrives. For example, a 5-10-31 with Iron is excellent for that.


LawnSite Bronze Member
Dollar Spot is sometime associated with lack of Nitrogen...


LawnSite Senior Member
what time of year does this fungus show up?


LawnSite Member
(Diseases of Turf, K-State Research and Extension Pub C-691):
The fungi which cause dollar spot survive indefinitely in thatch and soil. In the presence of a thin film of moisture on leaves and favorable temperatures, these fungi will begin to grow and infect leaves. The fungus apparently does not infect the roots, although toxins produced by these fungus may affect root formation. Dollar spot is most severe in late spring and early summer and again in early fall, however it can occur throughout the summer months.

The presence of dollar spot often signals an improper fertilization program since the disease is more severe in nitrogen-deficient turfgrass. One of the simplest methods to reduce or avoid dollar spot is to maintain an adequate nitrogen fertilization program. Don't overfertilize, since this can result in an increase of other turfgrass diseases, such as brown patch. Consult Extension publications on lawn fertilization for more complete information. Avoid night watering or other irrigation practices which allow the leaves to remain wet for long periods.