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Tropical Sod Webworms
Posted on 9/18/20 at 5:43 pm
Posted on 9/18/20 at 5:43 pm
There have been a fair amount of questions on sod webworms on the H&G board the past couple weeks. So here is a PSA - a 5 min video on tropical sod webworms, featuring Dr. Ron Strahan, weed science extension specialist and professor, was posted today by the LSU AgCenter. LINK
Might be helpful to those dealing with the issue. Not a great deal of detail of info on control agents, but covers life cycle and how to determine if this might be cause of your grass turning brown. I know some gain more from hearing someone speak on a subject than reading fact sheets.
Might be helpful to those dealing with the issue. Not a great deal of detail of info on control agents, but covers life cycle and how to determine if this might be cause of your grass turning brown. I know some gain more from hearing someone speak on a subject than reading fact sheets.
This post was edited on 9/19/20 at 8:50 am
7
Posted on 9/18/20 at 7:38 pm to CrawDude
Great info, but they need to buy him a microphone. The background noise made it pretty tough to watch.
Posted on 9/18/20 at 9:26 pm to CrawDude
The moths are small.
But those worms are not!
But those worms are not!
Posted on 9/18/20 at 9:39 pm to Whatafrekinchessiebr
Yeah that surprised me, the AgCenter Ag Communication’s unit almost always does a better job than that - must have been in a rush to get it out.
Posted on 9/19/20 at 1:52 am to CrawDude
I just laid waste to some worms in my backyard last week. Savages.
Posted on 9/19/20 at 6:06 am to CrawDude
Sprayed bifen yesterday morning. The little white moths were flying up everywhere as I was spraying. Hopefully they all died. Will spray again next weekend if the weather permits.
Posted on 9/19/20 at 6:40 am to PillageUrVillage
Was contemplating dropping granular bifen in this light rain. You’ve definitely had a resurgence of them in yard.
Posted on 9/19/20 at 9:56 am to CrawDude
Surprised he suggested bifen (Talstar). It’s not in the published literature from the Ag Center and doesn’t provide sufficient control for the larvae themselves.
Posted on 9/19/20 at 9:58 am to CrawDude
I see a ton of moths especially when I cut the grass this morning but I don’t see any damage from any worms. Is that normal?
This post was edited on 9/19/20 at 9:58 am
Posted on 9/19/20 at 10:00 am to NOLAGT
I’ve had moths for 1 or 2 months straight in my front without damage. Talstar doesn’t phase them (for me). Maybe they keep coming from elsewhere.
In back I had moths and first sign of damage last week. I destroyed the little spawns of satan larvae overnight.
In back I had moths and first sign of damage last week. I destroyed the little spawns of satan larvae overnight.
This post was edited on 9/19/20 at 10:01 am
Posted on 9/19/20 at 11:09 am to meeple
What are you using?
Posted on 9/19/20 at 12:10 pm to meeple
quote:
Surprised he suggested bifen (Talstar). It’s not in the published literature from the Ag Center and doesn’t provide sufficient control for the larvae themselves.
I’ll contact Dr Strahan and ask him to clarify and I’ll report back. I’m speculating, but may be wrong, that there are better products to control the caterpillar stage than bifenthrin but bifenthrin is so readily available and cheap to home consumer, and does a good enough job to recommend it. I’ve checked other southern land grant university websites on sod webworms and I’m not seeing a clear answer to this.
Posted on 9/19/20 at 2:53 pm to Capt ST
Anderson’s Duocide (Carbaryl is the main active ingredient)
Available on Amazon
Available on Amazon
This post was edited on 9/19/20 at 2:54 pm
Posted on 9/19/20 at 7:12 pm to meeple
Thanks, got to change something up.
Posted on 9/19/20 at 9:10 pm to CrawDude
quote:
I’ll contact Dr Strahan and ask him to clarify and I’ll report back.
I was digging for info and went to the ag center website and searched “webworms st. Augustine” and noticed an article posted on 9/18/20. It suggest Bifen as well. So I’m guessing they have a good reason to recommend it. I’ll grab some this week and try it if my latest treatment doesn’t have an effect.
Ag center link “Go easy on the turf”
quote:
To help control sod webworms, use an insecticide with the active ingredient bifenthrin. AgCenter entomologist Sebe Brown recommends liquid rather than granular applications for better control. You will need to retreat the lawn again in seven days to kill any newly hatched eggs. Spray will not control the moths. It is most effective on the main culprit doing the damage — the caterpillar.
Posted on 9/19/20 at 9:36 pm to ashy larry
Wait, so now they are for bifen? Crawdude posted an AgCenter article a few days ago that left bifen off their recommended control practices (and rightfully so because it doesn’t do much of anything against the actual grubs). Sounds like they need to circle the wagons on this, and fast, as it sounds like it’s coming to a head right now.
Sod Webworms Ag Center
I think Craw was also checking regarding this publication. Glad we have a local TD resource with some contacts.
Sod Webworms Ag Center
I think Craw was also checking regarding this publication. Glad we have a local TD resource with some contacts.
Posted on 9/20/20 at 6:55 am to ashy larry
The spray definitely kills the moths. Mine die overnight every time.
Posted on 9/20/20 at 11:21 am to CrawDude
Has anyone had success using Suspend for these suckers? I used the last of my bifenthrin on the first application last week and Amazon double shipped my order of Suspend I was planning on using in the house so I have plenty.
I don’t see it listed on LSU’s site but I found it mentioned on a paper from U of Tennessee’s ag paper.
I don’t see it listed on LSU’s site but I found it mentioned on a paper from U of Tennessee’s ag paper.
Posted on 9/20/20 at 12:27 pm to Whatafrekinchessiebr
Suspend (deltamethrin) is a synthetic pyrethroid as is bifenthrin. I don’t see downside in using it as you have extra, and it is mentioned in the UT publication you linked.
So many synthetic pyrethroids are effective insect kill agents but have little residual effect - they are designed to kill quick and break down into non-toxic components quickly, particularly in the outside environment. Maybe one of the reason that some feel they are not getting good control of the webworm caterpillars with bifenthrin - it kills but degrades very quickly. which requires repeated applications. Insecticides like Carbaryl (“Sevin”), a different pesticide chemistry and is also effective against webworm caterpillars, has a longer residual effect before breaking down into non-toxic components.
So many synthetic pyrethroids are effective insect kill agents but have little residual effect - they are designed to kill quick and break down into non-toxic components quickly, particularly in the outside environment. Maybe one of the reason that some feel they are not getting good control of the webworm caterpillars with bifenthrin - it kills but degrades very quickly. which requires repeated applications. Insecticides like Carbaryl (“Sevin”), a different pesticide chemistry and is also effective against webworm caterpillars, has a longer residual effect before breaking down into non-toxic components.
Posted on 9/20/20 at 1:22 pm to Whatafrekinchessiebr
You can use it. Is suspend polyzone? That has a long residual. I’d almost say save the suspend for mosquito treatments and buy another bottle of Talstar
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