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View Full Version : Black spots showing on lawn, looks like powder on grass


NEwhere1
09-13-2012, 11:48 AM
WTH is this stuff?

What do I do about it?



http://i1232.photobucket.com/albums/ff373/NEwhere1/IMG_5461.jpg

http://i1232.photobucket.com/albums/ff373/NEwhere1/IMG_5465.jpg

macgyver_GA
09-13-2012, 12:36 PM
Looks like Helminthosporium fungus

http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=6072#Diseases

I noticed two of these spots in my yard the other day. I think the cool dry week, followed by high humidity all last week, then a quick snap back to low humidity and cool temps on Sunday made conditions favorable.

macgyver_GA
09-13-2012, 02:08 PM
Here's a better article for turfgrass. I noticed that other one was for forage grasses. I was on my phone when I posted that last one.

http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=7395

http://edis.ifas.ufl.edu/lh048 - This one gives fungicides that will control it in turfgrass

Here's a "Homeowners reference" of fungicides and their common names and manufacturers

http://edis.ifas.ufl.edu/document_pp154

Looks like Spectracide Disease Control Granules contains myclobutanil which is labeled for turfgrass and is available at the big box stores for you to purchase.

macgyver_GA
09-13-2012, 02:27 PM
Could also be slime mold which will probably go away on its own since it's been dry all this week with no rain.

Take a closer pic of the individual leaf blades and post them.

NEwhere1
09-13-2012, 02:28 PM
Think it could be Slime Mold?

It does rub off of the grass.

NEwhere1
09-13-2012, 02:32 PM
Could also be slime mold which will probably go away on its own since it's been dry all this week with no rain.

Take a closer pic of the individual leaf blades and post them.

You posted while i was typing, I'm thinking that's what it could be too, I'll take closer pictures tonight and post them.

macgyver_GA
09-13-2012, 02:40 PM
Think it could be Slime Mold?

It does rub off of the grass.

If it rubs off, then I'm leaning towards slime mold.

I'll check my patches out tonight too and see if mine are the same. I noticed one on either side of my driveway over the weekend.

NEwhere1
09-13-2012, 02:51 PM
Just called "Lawn Doctor" who has treated our yard 2 times so far (got them coming before i had time to get interested in doing all this myself). Dude there said it's Powdery Mildue, and that Slime mold grows on the dirt vs. the living grass......Not convinced they know what they are talking about

macgyver_GA
09-14-2012, 09:44 AM
I was out mowing my yard yesterday evening and noticed the patches are pretty much gone. I think the dry weather all week took care of it.

NEwhere1
09-14-2012, 09:57 AM
I was out mowing my yard yesterday evening and noticed the patches are pretty much gone. I think the dry weather all week took care of it.

I looked too last night, the spots were less noticeable, and were not spreading. I could rub the black stuff off of some on the blades of grass i tried.

dKoester
09-14-2012, 06:20 PM
4 tablespoons of baking soda to one gallon of water and then sprayed on turf will work!

Mark Oomkes
09-14-2012, 06:31 PM
Just called "Lawn Doctor" who has treated our yard 2 times so far (got them coming before i had time to get interested in doing all this myself). Dude there said it's Powdery Mildue, and that Slime mold grows on the dirt vs. the living grass......Not convinced they know what they are talking about

Think I'd be finding myself a new LCO.