Lawn Care Forum banner
1 - 14 of 14 Posts

·
Registered
Joined
·
1,124 Posts
Discussion Starter · #1 ·
Hey Guys

So I've been going on the advice of someone that said fungicides kill the good bacteria in a lawn. I may have even repeated that. Well, I was reading on Iowa State University, and they stated:

Fungicides are pesticides that can kill or inhibit growth of fungi on plants, but they are not effective against bacteria, nematodes, or viral diseases.
https://hortnews.extension.iastate.edu/2011/6-1/fungicides.html

What is also interesting is talking to local lawn supply shop about fungicides, he said that applying with biofungicides is a great idea. And then there is this quote:

Lawndad said:
When I spoke with the Companion rep. he of course said that his was much better and that it should be used with a synthetic fungicide
Anyways, I'm all for learning and coming to conclusions yourself.. Anyone have any other actual documentation either way?

Tim
 

·
Registered
Joined
·
1,124 Posts
Discussion Starter · #3 ·
Nah they don't sell the biofungicides there. But I've been told if you use Serenade to prevent lawn disease, you shouldn't apply fungicides because it will kill the serenade bacteria. This indicates that isn't true.
 

·
Registered
Joined
·
376 Posts
Fungicides are pesticides that can kill or inhibit growth of fungi on plants, but they are not effective against bacteria, nematodes, or viral diseases.
That is correct. I remember having a PM discussion with jglongisland about this. Wish I could copy and paste it here but we know what happened with the PMs. You can use the two together though, no problem.
 

·
Registered
Joined
·
1,124 Posts
Discussion Starter · #8 ·
LIgrass said:
GrassDaddy said:
So the bacteria will actually fight the fungus on top of the chemical fighting it systemically.. sounds like a win win
I'm far from an expert on this but chemicals should only be used as a last resort. Besides resistance issues, I believe they kill other beneficial organisms in your soil.
Well thats what Im getting at.. at least one university says it doesn't so where is the info coming that it does?
 

·
Registered
Joined
·
1,824 Posts
GrassDaddy said:
LIgrass said:
GrassDaddy said:
So the bacteria will actually fight the fungus on top of the chemical fighting it systemically.. sounds like a win win
I'm far from an expert on this but chemicals should only be used as a last resort. Besides resistance issues, I believe they kill other beneficial organisms in your soil.
Well thats what Im getting at.. at least one university says it doesn't so where is the info coming that it does?
The problem is that fungicide kills the good fungi too.
 

·
Registered
Joined
·
1,053 Posts
Bottom line - fungicides do not target bacteria, but may affect/inhibit bacteria depending on concentration. Here is a very recent study on the compatibility on Bacillus Subtilis with chemical fungicides:

https://www.ijcmas.com/6-3-2017/H.%20Basamma%20and%20Shripad%20Kulkarni.pdf

It is compatible with some fungicides, not so much with others. The strain found in Serenade is probably one of those compatible with typical lawn fungicides at typical lawn application rates.

I would think that with foliar applications, the net effect of fungicides on soil bacteria would be negligible.

Fungicides definitely kill some of the "good" fungi too. No fungicides will kill the entire fungi population. If you can get away with not using fungicides, that's ideal. If you do get fungal disease, my personal approach is to attack it swiftly - I feel like when you have blood poisoning you take the antibiotic and worry about the bacteria in your gut later. If the potential for loss of turf and/or turf quality is acceptable, then one can try and manage fungal disease through cultural practices without fungicides.
 
1 - 14 of 14 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top