re: Grass ID

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Does anyone know the best way to fight the St. Aug that's trying to come into the zoysia. I have been hand pulling them but I'm sure that will get old.

I've read spraying Fusilade II. Anything else or better?

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Quinclorac’s Effect on St. Augustine Grass in a Zoysia LawnShort Answer: Quinclorac can damage or kill St. Augustine grass in a zoysia lawn without significantly harming the zoysia, but it’s not a guaranteed or complete elimination method. Multiple applications and careful application are needed, and there’s a risk of partial recovery of St. Augustine or minor zoysia damage. Fusilade II with Recognition Herbicide is often a more effective and safer option for selectively removing St. Augustine from zoysia lawns.

Detailed Explanation:Quinclorac’s Selectivity:Quinclorac (e.g., Quinclorac 75 DF, Quinclorac 1.5L Select) is a selective post-emergent herbicide designed to control broadleaf and grassy weeds like crabgrass, clover, and torpedograss. It is safe for zoysia grass when applied according to label instructions (e.g., 0.367 oz per 1,000 sq. ft. for Quinclorac 75 DF).

St. Augustine Sensitivity: Quinclorac is not labeled for use on St. Augustine grass and can cause significant damage, including discoloration, stunted growth, or death. However, it may not fully eliminate St. Augustine, especially with a single application, as St. Augustine’s aggressive growth via stolons allows it to recover faster than zoysia in some cases.

Effectiveness on St. Augustine:Partial Control: Lawn care forums and user experiences indicate that quinclorac can damage St. Augustine in a zoysia lawn, often discoloring it or stunting growth after the first application. However, multiple applications (e.g., 2–3 spaced 2–4 weeks apart) are typically needed to significantly reduce or kill it.

Challenges: St. Augustine spreads via stolons (above-ground stems), which can persist and regrow even after quinclorac damage. Its aggressive growth habit may allow it to recover if applications are not thorough or timed correctly.

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