re: Is it time for pre emergent in South LA?

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Some herbicides are too expensive for this waste.

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Are you referring to the costs per application of using granular vs spay pre-emergent herbicide? Certainly everyone should consider this when choosing a granular vs spray. - it’s certainly easy to calculate the cost per application for each and then decide.

I’ll be using Specticle pre-emergent herbicide for the first time this April/May to deal largely doveweed issues, that prodiamine or dithiopyr don’t control. It’s a very pricey herbicide, and you can purchase it as liquid/spray or granular product. My quick calculation of spray vs granular per application shows it much cheaper per application to use the spray, so that’s what I will do, b/c of its high cost.

The other thing that one must consider for the home user in cost per application, is that often spray pre-emergents may be sold only in larger containers - Simazine for example, the smallest container is 2.5 gallons but one uses a very small quantity per application. That’s OK as long as the herbicide has a very long shelf life, Simazine does. But if you purchase a herbicide with a much shorter shelf life and one has to replace it before you use it up b/c it’s efficacy has deteriorated over time sitting on the shelf waiting to be used, then perhaps the cost savings may not be realized.

Just something to consider when choosing the product.

If its a granular I'd think it would be fine to out out today. I think the rain is supposed to move in later tonight/early morning tomorrow so I would be a little wary of putting out spray.

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If its a granular I'd think it would be fine to out out today. I think the rain is supposed to move in later tonight/early morning tomorrow so I would be a little wary of putting out spray.

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I’d agree with the granular, and less sure about the spray in regards to the possible herbicide run off with a true heavy thunderstorm. Will need to be a judgement call.

I put out prodiamine and dithiopyr this morning in anticipation of rain tomorrow to water it in, but both were granular.

So I put down pre and post emergent today. Is it okay that I put both of them + suffercant + water together to spray the whole yard? Also how the hell do I clean out my sprayer? Its stained yellow from the prodiamine.

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Do you have a granular post emergent brand you’d recommend?

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Well, I have been using LESCO granular Dimension 0-0-7 (dithiopyr) with good success, and b/c so many on this board use Prodiamine I thought I’d try it so I purchased granular LESCO Stonewall 0-0-7 (prodiamine) and I applied granular Dimension in my front yard, and granular Prodiamine in my backyard a few days ago.

Dimension is particularly effective against crabgrass (and of course numerous other weeds) and will even kill young crabgrass, up to the 3 leaf stage, and to my knowledge prodiamine will not kill crabgrass after it germinates. I had a serious issue with crabgrass in my front yard 3 years ago, I eliminated it using Dimension in one year.

The granular Prodiamine was cheaper per 50 lb bag than the granular Dimension but the application rate is 8 lbs/1000 sq ft for Prodiamine and and granular Dimension 4 lbs/1000 sq ft, so cost per 1000 sq ft was cheaper for the Dimension. I’m trying to recall from memory, but I think the Dimension was about $34 per 50 lb bag and the Prodiamine about $22 per 50 lb bag.

Now, for the spray versions, which I have not used - yet, the prodiamine is cheaper per 1000 sq ft.

Sorry for the long answer for a simple question, but both these pre-emergents will provide you with very good results so you can’t go wrong using either, but if by chance you have a crabgrass issue, I’d recommend the Dimension.

I’ve been googling but can only find the pre emergent and not post emergent for what you were recommending above.

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Would split app refer to 6 months for now or are some people applying half rate now and a few months later applying again?

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I follow this plan at the link below. 1/2 of the yearly total split into two apps in the spring, and the other half in a single application in the fall.

LINK

My yard is primarily bermudagrass. Thanks for the help.

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My yard is primarily bermudagrass. Thanks for the help

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Well then I think the granular Fertilome Weed Out Broadleaf would work for you now provided the remainder of your lawn is not St Augustine. I’m still puzzled why this product is not labeled for use on St Augustine as it contains the same three “trimec” herbicides labeled for use on St Augustine in the liquid spray versions and which I use routinely on the St Aug in my backyard. I suspect concentration of the herbicide - I’ll need to research this.

You can’t use Atrazine on actively growing Bermudagrass, you can if it is dormant, but then that defeats the purpose of using a Weed & Feed product containing Atrazine. One does not, should not, fertilize dormant lawns. But there are some weed and feed fertilizers containing trimec herbicide you can use after you mow your lawn twice. Just check vendors that carry a good variety of fertilizer products.