Register free!

The Green Industry's Resource Center



Reply
 
Thread Tools   Display Modes
  #1  
Old 09-13-2012, 11:48 AM
NEwhere1 NEwhere1 is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Woodstock, GA
Posts: 63
Black spots showing on lawn, looks like powder on grass

WTH is this stuff?

What do I do about it?





Reply With Quote
  #2  
Old 09-13-2012, 12:36 PM
macgyver_GA macgyver_GA is offline
LawnSite Senior Member
 
Join Date: May 2010
Location: Canton, GA
Posts: 815
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.
Reply With Quote
  #3  
Old 09-13-2012, 02:08 PM
macgyver_GA macgyver_GA is offline
LawnSite Senior Member
 
Join Date: May 2010
Location: Canton, GA
Posts: 815
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...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.
Reply With Quote
  #4  
Old 09-13-2012, 02:27 PM
macgyver_GA macgyver_GA is offline
LawnSite Senior Member
 
Join Date: May 2010
Location: Canton, GA
Posts: 815
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.
Reply With Quote
  #5  
Old 09-13-2012, 02:28 PM
NEwhere1 NEwhere1 is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Woodstock, GA
Posts: 63
Think it could be Slime Mold?

It does rub off of the grass.
Reply With Quote
  #6  
Old 09-13-2012, 02:32 PM
NEwhere1 NEwhere1 is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Woodstock, GA
Posts: 63
Quote:
Originally Posted by macgyver_GA View Post
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.
Reply With Quote
  #7  
Old 09-13-2012, 02:40 PM
macgyver_GA macgyver_GA is offline
LawnSite Senior Member
 
Join Date: May 2010
Location: Canton, GA
Posts: 815
Quote:
Originally Posted by NEwhere1 View Post
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.
Reply With Quote
  #8  
Old 09-13-2012, 02:51 PM
NEwhere1 NEwhere1 is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Woodstock, GA
Posts: 63
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
Reply With Quote
  #9  
Old 09-14-2012, 09:44 AM
macgyver_GA macgyver_GA is offline
LawnSite Senior Member
 
Join Date: May 2010
Location: Canton, GA
Posts: 815
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.
Reply With Quote
  #10  
Old 09-14-2012, 09:57 AM
NEwhere1 NEwhere1 is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Woodstock, GA
Posts: 63
Quote:
Originally Posted by macgyver_GA View Post
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.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 06:08 AM.

Page generated in 0.06824 seconds with 9 queries