Helminthosporium Pays Us A Visit Again

Leaf Spot by Eric von Hofen
Almost over night we see the results of Helminthosporium on our TifEagle greens. This is the first time in a year we have seen any signs from our little friend here in Miami. I wrote a similar post on this disease almost a year ago to date. Last year we had record cold temps that brought on the signs of the disease. This year we have had a month of well above temps with light rains that have kept the soil around 80 degrees. This was just enough to increase the pressure of the disease and for us to see the damage. I have started a program of applying fungicides on a 14 to 21 day rotation. I will use Fore, Insigna and Daconil for control and prevention of the leaf spot this winter. It has been 16 days since my last fungicide application so I’m not surprised to see the spots pop up. I spray my greens every friday with a light Harrells fertilizer package so adding fungicides will be easy to do. I will keep you updated this winter on the progress on the control of Helminthosporium. I see a connection between the amount of sun, rain fall and soil temps when the Helminthosporium shows up. Let me know what your seeing on your golf course.

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PERFECT WEATHER FOR FAIRY RING ON TIFEAGLE

Fairy ring
Fairy ring shows up after a three year hiatus. Summer time is here and soil temps are at their peak and boom out comes the fairy ring. Yes, it’s that time of the year when our mushroom producing friend shows his face and tries to kill the greens.

On Monday morning we did not have any signs of fairy ring and by Wednesday afternoon we could see the rings of decline with mushrooms starting to show up. What changed so fast you may ask? We started the third round of aeration on the Tif-eagle greens and the soil temps are at 95 to 100 degree. This is all it took to let the fungi wake up and take off. Remember that there are over 60 different fungi that can be associated with the symptoms. The odds are against you not experiencing this problem in your turf management career.
Fairy ring on tifeagle bermudagrass
I went to the office, picked up my Fieldscout moisture meter and headed back out to the three greens I noticed with the rings. I tested the moisture inside the fairy ring and then outside of the ring and was shocked at the difference.

Moisture meter
Inside the moisture was 22%.

Fieldscout meter
Two inches away the moisture was 33%

We sprayed a strobilurin fungicide along with a wetting agent this morning and watered it in for six minutes. I do not spray any preventive fungicides and only treat when I know the problem will not go away by itself. We have not sprayed any strobilurin based fungicides for six months so it should work in one shot. I will keep you updated on the process of keeping the disease in check and when the rings disappear. I would love to hear your story about dealing with fairy ring.

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Helminthosporium on TifEagle Bermudagrass Greens

eric von hofen
Almost over night we see the results of Helminthosporium on our TifEagle greens. This is the first time this year we have seen any signs from our little friend. We have had two weeks of well below temps that have taken the soil below 50 degrees. This was just enough to increase the pressure of the disease and for us to see the damage. One good thing is that we have had full sun and no rain. This will help bring the soil temps back up above 58 degrees and start growing turf again. I plan on starting a program of applying fungicides on a 14 to 21 day rotation. I will use Heritage, Insigna and Daconil for control and prevention of the leaf spot this winter. It has been 32 days since my last fungicide application so I’m not surprised to see the spots pop up. I spray my greens every friday with a light fertilizer package so adding fungicides will be easy to do. I will keep you updated this winter on the progress on the control of helminthosporium.
Eric von Hofen

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