Spring Pre-Emergent - Baton Rouge Area

The rates for centipede/st aug are different that for Zoysia. So you'll want to use the lower rate. 6oz per acre off the top of my head. I use Specticle in the fall and prodiamine in the spring. Specticle will prevent weeds for longer than prodiamine so your application timing doesn't have to be as accurate. Last week of February would be a good starting point.

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RaginCajunz

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Better to err on the side of applying it too early vs too late - the first week of Feb would not be too early to apply it in my opinion. There is fair amount of rain forecast next week if you want to time the application to water it in.

How much was your bottle of Specticle Flo?

What’s the application rate for that? How long will a bottle last, or what is the estimated sq ft for a bottle at st aug rates ?

I was reading the label insert, is it best to do a split application? 45 days after the first vs a single ?

Are you adding anything else while you’re at it? Post emergence control or any insect control ?


I wish we had a sticky with common agents, with dosing guide and using multiple agents during a single app …all mixed in something common like 1 gallon per thousand foot .

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Based on my previous calculations with a 1/2 acre lot. (less area once you subtract house, shed, office, pool, driveway) It should last me for nearly 3 years @ 3 x year application rate. Hurts up front, but it's not a terrible cost. Plus, how much will it save me on herbicides to tame weeds that take over?

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Yes - for a common residential lawn that is correct. I have 9500 sq ft of lawn to spray, and my calculations show, 3 years @ 3 applications per year per 18 oz bottle, or 4 years @ 2 applications per year.

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I’ll get into the label later but if someone wants to break down mixing instructions or tips that would be great.

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4 mL per 1000 sq ft = 6 oz/acre labeled rate.

I personally shake the bottle real good, use a larger 10 mL syringe with a large gauge needle (like a turkey injection syringe) to withdraw 4 mL (pour some from the 18 oz bottle into another smaller wide mouth container first) then inject the 4 mL into 2 gallons of water in a 2 gallon sprayer, shake to mix, and then spray 1000 sq ft of lawn.

If you have a 4 gallon backpack sprayer, then use 8 mL of Specticle in 4 gallons of water and spray 2,000 sq ft.

Don’t forget to water it in within several days in the absence of rain.

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If you have a 4 gallon backpack sprayer, then use 8 mL of Specticle in 4 gallons of water and spray 2,000 sq ft.

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I feel like I usually spray less than that. Should I walk extra slow?

In theory, could you: (?)

- calculate the mLs needed to cover your area
- Dilute that amount into a hose-end sprayer jar
- Set the dial to a volume that would allow you to cover your area/drain the jar in 2-3 passes