|turf is starting to turn colour as the winter solstice approaches|
|absolutely no disease|
|I found a spot! nothing my spray bottle can't handle.|
|None here either|
In years where we have had abnormally cold and dry winters I have seen a fungicide application last months as the grass was more or less frozen solid with no insulating snow cover. Either they were lasting longer or the disease had no hope in the cold weather or maybe a bit of both.
For the past few years I have been using Primo Maxx during the winters and less so in the summer months. As mentioned earlier in this post, maybe the extra slow growth I am seeing and therefore less mowing is why I am seeing less disease. I think there is more to it. I am now thinking that maybe because I am mowing less, that I am removing less of the systemic fungicide that was applied months before.
The last fungicide application I applied this year was on Oct 23rd. It was propiconazole, a systemic DMI, which probably further reduced the growth of the turf. Aside from a few weeks of unseasonably cold and dry weather, we have had a warm and very wet fall so far. The current weather could be considered perfect fusarium weather, but there is no new disease on my greens despite the last fungicide application being made 43 days ago! For a West Coaster this is not common in weather like this!
The winter application of Primo and propiconazole has resulted in no need to mow the greens since Nov 3rd. That's 32 days ago! On my course tour today there was no need to mow the greens. If anything a light topdress will do to keep them rolling nice and true through the next month. So maybe the lack of mowing is spreading less disease around AND removing less fungicide from the plant!
I'm really glad that there is no new disease on my greens because even if there was, there would be no way for me to do anything about it. Winds are high, rain is almost constant and when the rain stops the turf quickly frosts over. I can't get my sprayer out to apply anything!
I would be very interested to see studies done which look into what I am seeing. Do plant growth regulators combined with fungicides increase the longevity of protection when the grass is mowed only as needed? From what I am seeing, I think this could be the case....
The impacts of this could be big for us guys out West. If we can get our fungicide apps to last longer, we can save a lot of money and reduce the impact that these products have on the environment (if any).