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TEACHING RESEARCH EXTENSION
 
In the Field

May 18, 2009
Yellow rings are beginning to show up on annual bluegrass putting greens throughout the region.  These often irregular (scalloped), yellow rings are the symptom commonly associated with brown ring patch (or Waitea patch) disease.  This disease is similar in appearance to yellow patch (or cool-season brown patch) which occurs during temperatures of 50 to 65 F.  However, unlike yellow patch which subsides as temperatures exceed 65 F; brown ring patch develops and persists throughout warmer temperatures (60 to 85 F) and only affects annual bluegrass turf.

Recent research conducted in California by Dr. Frank Wong indicates increased nitrogen fertility reduces brown ring patch severity and improves fungicide efficacy.  Flutolonil or combinations of propaconazole and polyoxin-D or azoxystrobin applied in ≥ 2 gallons of water or lightly watered in have been shown to be the most effective approach for curative control of this disease.  For more information and photos of symptoms view the brown ring patch factsheet.

 

April 21, 2009
Seedheads and annual bluegrass weevils (ABW) are emerging in Southwestern CT.  Tracking the development of these pests across the region is easier these days due to web-based resources.  Fore Cast is a website from Cornell that tracks growing degree days and calculates when seedhead control applications should be made throughout the northeast.  Superintendents in southern CT seem to be on track this year as several reported making Proxy/Primo or Embark applications during the past week and a half.

Weevil Trak is another website, sponsored by DuPont, which displays the occurrence of various ABW stages throughout the region.  This information can be used to help track ABW development and time insecticide applications accordingly.  For more information on ABW control options see Dr. Pat Vittum’s (UMASS) recent posting.

In the UCONN Turf Diagnostic Center, most submissions to this point have been associated with slow turf growth as a result of cool temperatures, not disease activity.  However, this week’s rainfall and warm temperatures forecasted over the weekend likely will encourage disease activity including brown ring patch and yellow patch. 

 The information in this material is for educational purposes. Any reference to companies, commercial products, trade or brand names is for information only, and no endorsement or approval is intended.

 

April 2, 2009
The current rains moving through the state are a relief for many since most of Connecticut is 3 to 4 inches below normal precipitation levels for the year.  Dry conditions have limited disease activity so far; however expect that to change as recent rain and warming temperatures stimulate disease.

Snow molds were prevalent this winter, and cool wet weather (30 to 60 F) will continue to provide conditions favorable for pink snow mold.  Stimulate growth in affected areas by raking, verticutting or grooming and fertilizing to grow out of damage. 

Forecasted high temperatures over the next 15 days look to be holding steady in the upper-40’s to low-50’s and lows in the mid-30’s.  However, once high temperatures increase to the mid-50’s be on the look-out for basal rot anthracnose and typical spring diseases like yellow patch and red thread.

Now is the time to begin considering an early-season fungicide application to reduce dollar spot pressure on fairways this summer.  Research conducted at UCONN indicates that the onset of dollar spot symptoms can be delayed by early season fungicide applications.  Furthermore, it may be possible to control dollar spot with reduced rates throughout the season by suppressing the fungal population early in the season.  Early-season fungicide applications should be made after the second true mowing of fairway turf.  See the 2006 UCONN Turfgrass Research Report for fungicide results of early-season applications.

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