Pest Alert №14 — That’s a Wrap: Dollar Spot Took Off and then Crashed (it got cold)

Image 1. During the fall in Chicago, very rapid dollar spot development can occur in creeping bentgrass stands. Here it is seen on an untreated nursery green where low nitrogen conditions predominate. Settle, Oct 20, 2021
Image 2. Close up of creeping bentgrass nursery green. Dollar spot infection centers can coalesce creating much larger areas of damage. Settle, Oct 20, 2021
Image 3. An example of high dollar spot pressure with up to 80% damage in untreated plots. This is the very same creeping bentgrass location used in 2021 (Fairway 8, North Shore Country Club, Glenview, IL). This was during a “bad year” weather-wise. A year of consistently hot, humid weather in Chicago. Settle, Aug 24, 2010
Figure 1. A summary of dollar spot data for 2021 indicated disease pressure in a fairway (up to 10%) was lower than what is usually experienced. Weather conditions were variable during the 2021 growing season.
Figure 2. An Oct 11 soil sampling of each plot in the study found good diversity of seven different root-feeding nematodes but was without statistical differences (P<0.05). Nevertheless this is good information and shows a 100 year old turfgrass system is fairly balanced across nematode genera. No damage by nematodes occurred.

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Dedicated researchers and turf pathologists working for golf course superintendents in the Chicago area.

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CDGATurfgrassProgram

CDGATurfgrassProgram

Dedicated researchers and turf pathologists working for golf course superintendents in the Chicago area.

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