Controlling Zoysia Seedheads

Zoysiagrass is well adapted to transition zone fairways, but spring seedheads of ‘Meyer’ zoysia are unsightly and cause are difficult to mow cleanly, especially after delayed mowing from spring rains. Recent university research and on-course observations show fall-applied Proxy^® limits zoysia seedheads in the spring. Here is what we know to date:

• Why do fall applications work? – Similar to Poa annua, seedheads of ‘Meyer’ zoysia (zoysia japonica) apparently are initiated in the fall, so applications during seedhead initiation will limit development in spring. However, this likely will not be as effective on cultivars of Zoysia matrella that have two seedhead periods, one in the spring and one later in the summer
• Only one application - A single fall application of Proxy at 5 oz/1000 sq ft can reduce seedheads up to 80%
• Timing of application – Experience shows that the application should be no later than the first large patch timing (mid-September, soil temps of 72-75oF at a 2-inch depth). Current university research suggests that earlier applications may be more effective, but that is still preliminary.
• Spray volume – For optimal control of seedheads (and large patch with fungicides), apply at 1.0 – 2.0 gals/1000 sq ft.
• Do not water in – Studies have shown that following up with as little as 0.125” of irrigation after application reduces control
• Variability? – Proxy works well on established ‘Meyer’ zoysia but we have heard of variability of control due to sod source, age of zoysia, etc. Therefore, it’s important to test on your course and be sure to leave an untreated area to determine how well it works in your situation
• Label language – Though zoysia or zoysia seedheads are not specified on the current label, golf course fairways are listed as a site where Proxy can be used
• Need more info? – Contact your Envu Area Sales Manager if you need assistance.

Zoysia seedheads in the spring can be minimized with Proxy® applied in the fall (Envu)