A Blog and Disease Update

So far the summer has been very busy for all of us and I personally apologize for not posting as much as I would like. You would think that posting an update a week would be easy, but it is once again proving difficult with all of the research, internship visits, website development and other things that I am currently working on. The good news is that we are rolling out several new bloggers to the site in the next month. I will let them introduce themselves in their first post as Dr. Damon Smith did in his first post from Oklahoma. We are also working on a redesign and launch of a more substantial website (not sure of a roll out date, but at this rate it will be in 2012) which will provide even more information about turfgrass diseases and likely some other areas of focus. So look for that in the future and in the meantime please welcome our new bloggers as they start to post!

In terms of diseases around the region, there is still a lot of talk about the etiolation of bentgrass on putting greens in the mid-Atlantic (and other areas as well). While there have been reports of a bacteria found in association of these symptoms there are as many reports of the symptoms being present without any bacteria found. The bottom line is that the verdict is still out regarding the cause of these symptoms and the impact that this will have as we move closer to the middle of the summer. While I am still skeptical about topic as a whole, I concur that if you are experiencing these symptoms you should perform basic cultural practices to minimize stress as if you had bacterial wilt. These include:

• Raising mowing heights
• Utilization of a dedicated mower for the affected greens
• Mowing when the greens are dry
• Maintaining greens as dry as possible
• Avoiding abrasive cultural practices (e.g., topdressing, vertical mowing, etc)
• While there are no real control measures for BW, the use of Copper-based fungicides may help a little.

Additional diseases that are appearing at this time include your typical brown patch and dollar spot, an unusual basidiomycete associated with what has been called "thatch collapse" (image right), anthracnose, fairy ring, root pythium and probably others that I am forgetting. In general, this is the time when most of our summer diseases start kicking it into high gear.

For more information on Bacteria , you can visit a search I did on this blog.

Poa seedheads, basidiomycetes, and the usual suspects

With the recent spell of "warm" weather in combination with relatively high humidity, there were outbreaks of diseases we may typically see in June or even July. I reported a couple of weeks ago that things seemed to be picking up fast on the disease front. However, things seem to have slowed down again...at least for the time being.

A quick walk around Valentine (Penn State's Turf Research Facility) was met with the usual suspects at this time of the year. We are seeing red thread and some leaf spot in the roughs, brown ring patch on the Poa putting greens, and today I saw what I believe to be superficial fairy ring (below). We are planning on isolating this one and hope to compare it to what we found over the last few weeks and what I have been calling Thatch Collapse (right). The SFR is showing up in my fertility plots, so it will be interesting to see if there is a difference based on N-source.

Other than that, Poa seedheads are in full force and we are seeing good control in select treatments. I hope to talk about this in the next few weeks once I get the data analyzed, but tentatively it looks like we are seeing good control with a few products and our application timings did make a difference in the level of control.

Things are picking up FAST!

Yesterday (this was meant for yesterday, but new disease activity today [Tuesday] has me posting a day late) I had the pleasure of hanging out at the Rutger's Annual Golf Classic which raises funds for their research program. I even got to play a little golf with our Midwest blogger Jim Kerns. Having left State College on Sunday and not really seeing much of anything on the disease front at Penn State, I was excited to find out if there were any actual turf diseases in the field...we hit the jackpot in North Jersey.

While certain diseases like anthracnose, leaf spot and brown ring patch were very active, I was surprised to see active dollar spot and RECOVERING brown patch (looked like it was active about a week ago or so). I think that things have been some moist and humid that everything is just taking off at this point. This would definitely be the earliest I have ever seen brown patch in the mid-Atlantic region and is in general pretty early for dollar spot as well.

Thatch collapse

This morning I headed into the Valentine research facility in State College and was surprised to see a LOT of disease activity there as well. We still don't have any dollar spot and brown patch is definitely a ways off for us, but there are several things going on. First, seedheads are in full force right now and we will be rating our plots over the next few weeks to see what worked and at what timing. As for diseases we are seeing: red thread, leaf spot, brown ring patch (images below, we are confirming by isolation...update to come), thatch collapse (see next month's GCM issue), Microdochium patch, and probably something else that I am forgetting.

So diseases are here or just around the corner...we could be in for another long year.