September! Perfect Temps, Dollar Spot Pounces, Dry Continues, and Fall Divot Research

Image 1. Dollar spot hits peak pressure. A fungicide treatment stands out on a L-93 creeping bentgrass fairway at North Shore Country Club in Glenview, IL. Settle, Sep 7, 2022

Weather Update (Sep 1st week) by Shehbaz Singh, MS

North Shore CC, Glenview. As the week proceeded, typical fall weather began and air temperatures ranged from 56 to 80°F. September 8th represented the lowest temperature of the week (56.5°F). These lows (50s) on a consistent basis will help reduce dollar spot disease pressure. Relative humidity still remains high although soil conditions are generally dry. Early in the week relative humidity was 70-80% then rose to 80-90%. Trace rainfall of 0.07 and 0.03 inches occurred on Sep 7 and 8 respectively. Total cumulative rainfall for northern Chicago suburbs over last seven days was low. For example, 0.13 inches occurred in Glenview. Conditions are dry.

Figures 1 and 2. Weather conditions in north and south Chicago suburbs during September, 2022.

Dollar Spot Hits Peak Pressure, Clarireedia jacksonii

Its always impressive when the weather shifts from summer to fall. Conditions can rapidly become ideal for foliar fungal disease development. Dollar spot is one example. This disease is problematic because creeping bentgrass, Agrostis stolonifera, is highly susceptible.

Image 1. Peak Disease Pressure: Current dollar spot damage in a L-93 plus Providence creeping bentgrass nursery green fungicide study. North Shore Country Club, Glenview, IL. Settle, Sep 7, 2022
Image 2. Peak Disease Pressure: Current dollar spot damage in a L-93 plus Providence creeping bentgrass nursery green fungicide study. North Shore Country Club, Glenview, IL. Settle, Sep 7, 2022
  • Judicious use of fertilizer (not too little, not too much)
  • Interrupt leaf wetness periods (early morning dew removal)
  • Light weight rolling can reduce dollar spot (5 days per week)

Fall Divot Research Begins by Shehbaz Singh, MS

This week on September 6, I initiated the fall divot timing on both creeping bentgrass and Kentucky bluegrass tee studies respectively. The objective of the current study is to evaluate the impact of three different seasons on various divot treatments and their effect on turfgrass recovery. Preliminary results from both spring and summer timings suggest that certain divot mixes can vary in their ability to recover depending on the season.

Image 1. Fall Treatments: Divots are uniformly made with a tool; adjacent to summer and spring treatments (rows to the right). A Piranha creeping bentgrass tee at Bob Berry Sunshine Course, Lemont, IL. Singh, Sep 6, 2022
Image 2. Fall Treatments: Artificially created divots (1/2 inch deep) are then uniformly filled with divot mixes or are refilled with washed sod pieces. A Piranha creeping bentgrass tee at Bob Berry Sunshine Course, Lemont, IL. Singh, Sep 6, 2022
Figure 1. Spring Treatments: Results to date show a lengthy period of recovery was required for a majority of spring divot treatments in a Piranha creeping bentgrass tee at Bob Berry Sunshine Course, Lemont, IL.
Figure 2. Summer Treatments: Results to date show a faster recovery can occur for some treatments in the summer in a Piranha creeping bentgrass tee at Bob Berry Sunshine Course, Lemont, IL.

Final Photo

Honey bees are highly attracted to Hylotelephium spectabile ‘Autumn Joy’, Evanston, IL. Settle, Sep 7, 2022

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CDGATurfgrassProgram

CDGATurfgrassProgram

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