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Started By
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St. Augustine Grass - time needed between fungicide and weed & feed
Posted on 3/15/20 at 10:00 am
Posted on 3/15/20 at 10:00 am
A few weeks ago I applied the trio from Clegg's as suggested another thread (pre-emergent, post-emergent, and sticker). It seems to have had good results on the crap growing in the yard. My sod is only a year old so I had limited weeds.
Anyway, I have some brown patches that appear to be fungus. I was stupidly hoping they'd go away on there own. I am about to mow then apply a spray-on fungicide. I also want to apply some 'Scotts Turf Builder Southern Triple Action'. This would hopefully take out the few remaining weeds, kill some bugs, and feed the lawn. However, I can't really find much information on the timing between applying the fungicide. I'm thinking a I should wait at least a week, but don't know.
tldr;
Do I have to wait b/t fungicide and weed/feed?
Anyway, I have some brown patches that appear to be fungus. I was stupidly hoping they'd go away on there own. I am about to mow then apply a spray-on fungicide. I also want to apply some 'Scotts Turf Builder Southern Triple Action'. This would hopefully take out the few remaining weeds, kill some bugs, and feed the lawn. However, I can't really find much information on the timing between applying the fungicide. I'm thinking a I should wait at least a week, but don't know.
tldr;
Do I have to wait b/t fungicide and weed/feed?
2
Posted on 3/15/20 at 10:08 am to ashy larry
Post some pictures of the brown spots and we can go from there.
Posted on 3/15/20 at 10:26 am to ronk
This post was edited on 3/15/20 at 10:31 am
Posted on 3/15/20 at 10:48 am to ashy larry
Large patch. Use Scott’s disease X. Don’t use a high nitrogen fert and don’t apply weed control.
Posted on 3/15/20 at 11:01 am to ashy larry
St Augustine will need a fungicide plan throughout your growing season.
Axozystrobin
Propiconazle
At least this. Anytime temps are over 85 days and 65 nights
Axozystrobin
Propiconazle
At least this. Anytime temps are over 85 days and 65 nights
Posted on 3/15/20 at 11:20 am to ronk
Thanks guys!
Posted on 3/15/20 at 11:40 am to ashy larry
That top photo is a good one that could be used in publications to show the classic circular pattern of large patch (formerly called brown patch) fungal disease. Here is a LSU AgCenter fact sheet Large Patch
Apply the fungicide recommended by ronk and CentlaLowel. You already taken care of weed control through your previous activities of pre-emergent and post-emergent herbicide applications, you certainly don’t require “weed & feed” particularly to a diseased stressed lawn. Excessive use of lawn herbicide is not helpful.
Large patch tends to re-occur in the same areas if conditions are favorable from year to year so it will likely be wise add a fungicide application to your lawn management program in the late winter/spring going forward.
To answer your question on “timing”, you can apply lawn fungicides and herbicides within close time proximity of each other, a day or week would be fine unless specified otherwise on a product’s label.
Apply the fungicide recommended by ronk and CentlaLowel. You already taken care of weed control through your previous activities of pre-emergent and post-emergent herbicide applications, you certainly don’t require “weed & feed” particularly to a diseased stressed lawn. Excessive use of lawn herbicide is not helpful.
Large patch tends to re-occur in the same areas if conditions are favorable from year to year so it will likely be wise add a fungicide application to your lawn management program in the late winter/spring going forward.
To answer your question on “timing”, you can apply lawn fungicides and herbicides within close time proximity of each other, a day or week would be fine unless specified otherwise on a product’s label.
Posted on 3/15/20 at 11:54 am to CrawDude
to piggyback on this, I have the same issue in my st aug. I'll apply the fungicide soon. how long to wait and apply the fertilizer after the fungicide?
I sprayed the weed cocktail about 8 days ago.
ps-thanks again to ronk, crawdude etc for all the help
I sprayed the weed cocktail about 8 days ago.
ps-thanks again to ronk, crawdude etc for all the help
Posted on 3/15/20 at 11:57 am to specchaser
Old school thinking was never fert an active fungus. I was at a conference with a Texas A&M turf Dr Snd she said new studies suggest ferting helps large patch and take all patch recover.
Posted on 3/15/20 at 12:33 pm to CrawDude
This short Clemson U fact sheet on large patch is also informative - it s current and provides a few more specifics to complement the LSU AgCenter fact sheet. Provides specific brand names of fungicides to look for in the stores which I know followers new to all this like Brown Patch & Large Patch Diseases of Lawns
This post was edited on 3/16/20 at 10:02 pm
Posted on 3/15/20 at 5:46 pm to specchaser
quote:
to piggyback on this, I have the same issue in my st aug. I'll apply the fungicide soon. how long to wait and apply the fertilizer after the fungicide?
Why don’t you e-mail Dr Ron Strahan (rstrahan@agcenter.lsu.edu).turf grass and weed specialist with the LSU AgCenter and ask his advice - provide him details: St Augustine, you sprayed post-emergent herbicides, you have large patch (you might want to send him photos on that), you’ll be applying fungicide and you need to know what he’d recommend on a fertilization regime following fungicide application. When he gets back with you on recommendations, jump back in let us all know what he says.
I’ve personally not dealt with this issue and it doesn’t seem to be addressed directly in the large patch fact sheets, so it’s best that Dr. Strahan guide you on this.
This post was edited on 3/15/20 at 7:04 pm
Posted on 3/15/20 at 6:28 pm to CrawDude
I’d be curious what he has to say. A&M currently says fert but do so correctly. 4 years ago when I was in BR Dr Strahan said don’t fert.
Posted on 3/16/20 at 10:10 am to CrawDude
Dr. strahan responded quickly. He recommended spraying the fungicide again in 10-14 days and fertilizing in April.
I know it's probably been answered but what fertilizer do you guys recommend? (st aug, lafayette area)
I know it's probably been answered but what fertilizer do you guys recommend? (st aug, lafayette area)
Posted on 3/16/20 at 10:37 am to specchaser
I use 25-3-5 on St Aug. You do not want to use high nitrogen on St Aug.
This post was edited on 3/16/20 at 12:02 pm
Posted on 3/16/20 at 3:28 pm to ronk
is there a certain brand you recommend? or just go to the local feed store and look for something w/ that breakdown?
sorry if these are dumb questions, this is the first time i've been serious about lawn care
sorry if these are dumb questions, this is the first time i've been serious about lawn care
Posted on 3/16/20 at 4:41 pm to specchaser
I get 25-3-5 from Bonus crop but they are located in Greenville, Tx. Site one has 24-2-11 which is going to be just as good.
Posted on 3/16/20 at 5:02 pm to specchaser
I use the LESCO 24-2-11 from Site One (Baton Rouge) unfortunately you don’t have a Site One in Lafayette. You should be able to find this Fertilome 24-0-4 in Lafayette. LINK Good chance your soil is not deficient in P in Lafayette but you can always have that verified with a soil test by the LSU AgCenter.
Posted on 3/17/20 at 5:47 pm to CrawDude
Should I de-thatch before or after applying the fungicide?
Posted on 3/17/20 at 11:11 pm to Clint Torres
Do you plan on just aeration or using a dethatching mower or power rake?
Also, when it comes to fungicide you want to rotate between azoxystrobin and propiconizole. I like azoxystrobin first because it is stronger.
Also, when it comes to fungicide you want to rotate between azoxystrobin and propiconizole. I like azoxystrobin first because it is stronger.
Posted on 3/18/20 at 6:13 am to CenlaLowell
quote:
St Augustine will need a fungicide plan throughout your growing
I have seen similar statements made about having a "fungicide plan". At what frequency during the growing season should fungicide be applied?
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