|#5 Green looking South East. This green has high disease|
pressure due to shade.
This week the Fusarium returned to my putting greens. During the warmer drier summer Fusarium usually isn't a problem as I usually have full control over the environmental conditions surrounding my putting greens. This time of year I have almost no control over the conditions. I cannot increase the air or soil temperatures nor can I stop the rain! This makes it almost impossible to use cultural control methods to fight Fusarium this time of year (September). So sadly my fungicide free summer had come to an end.
|#6 Green looking South. This green sees almost no|
disease even in the winter months.
So I wondered how much shade were they getting versus the areas with no disease? If I could reduce the shade during this time of the year on those highly susceptible areas I could potentially push my first fall fungicide app back a few weeks, or even a month. So I set out with my new-found App in search of disease.
|#4 Green looking South. This green sees no direct sunlight|
in the fall and has a very high disease pressure.
I divided each green into quadrants and measured how much direct sunlight potential each area had during the Equinox. I recorded this along with the disease pressure that I had observed during that time period. I was really only concerned with the Fusarium that was present and not the other "summer" diseases that I noticed. I complied the data into a spreadsheet and organized the data according to the severity of disease. This gave me a clear idea of how much sunlight I needed to reduce the severity of Fusarium this time of year!
Areas on my greens that received less than 3.5 hours of sunlight during the Equinox had the highest disease pressure from Fusarium. Areas with 3.5-5.5 hours of sunlight had medium disease pressures and areas with over 6 hours of sunlight a day had no disease.
|Fusarium on the back of #4 green.|
I highly recommend this app and I'm sure that it will more than pay for itself ($5.99) this next season. In total it took me longer to type this blog out than it did to collect the data so you should have no excuse not to do this for every putting green on your course!