Southwestern Zone
Late Winter/Spring Weed Control Program Warm-season Fairways and Roughs
Crabgrass germinates when soil temperatures average 55°F and is best controlled with the preemeregnce herbicides Ronstar ® or Specticle ® . (Envu)
Month February 1 July Week 5 6 7 8 9 10 11 12 13 14 15 16 17 18 192021 222324252627282930 March April May June
Prioritized Options
Priority Explanation
Specticle FLO 4 4.5 fl. oz./A Apply 60 days after previous application
For Ronstar- resistant
Specticle ® FLO 4 4.5 fl. oz./A
goosegrass sites Control through August
Better
Ronstar ® FLO 2 81-122 fl. oz./A (2.0-3 lb ai/A) or Ronstar 3 on Fertilizer 2.0 – 3.0 lb. ai/A
Ronstar 3 on Fertilizer 2 lb. ai/A
Control through August
Best
Apply 90 days after previous applications
Sand >85% or Soil Organic Matter <0.1%
Specticle FLO 4 3 fl. oz./A Apply 30-45 days after previous application
Specticle FLO 4 3 fl. oz./A Apply 30-45 days after previous application
Control through August
Best
Specticle FLO 4 3.0 fl. oz./A
Follow all label directions and local recommendations. 1 If turf is dormant, non-selective herbicides like Roundup ® Pro can also be added to the tankmix to expand the number of MOA’s. 2 Higher rate should be used in most areas for maximum control and resistance management, lower rates could be considered in lower pressure areas. 3 Spread rate should be minimum of 250 lbs of fertilizer per acre for regular granule size and 200 lbs per acre for mini granule size. 4 Do not apply if turf injury is present and assess turf quality before each application
Goosegrass germinates usually a couple of weeks later than crabgrass. Ronstar ® is an industry standard for goosegrass control, plus it allows sprigging into an application because it is absorbed by the shoots and not roots. (Envu)
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