Crabgrass germinates when soil temperatures average 55°F and is best controlled with the preemeregnce herbicides Ronstar ® or Specticle ® . (Bayer)
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. (Bayer)
Month July Week 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 February March April May June
Prioritized Options
Priority Explanation
2 Specticle ® FLO 6 fl oz/A or Ronstar on Fertilizer 2 lb ai/A
Ronstar ® FLO 122 fl oz/A (3 lb ai/A) or 1 Ronstar on Fertilizer 3 lb ai/A
1A
Control through August
Apply 90 days after previous application
For Ronstar-resistant goosegrass sites Control through August
1B
2 Specticle FLO 9 fl oz/A
Sand >85% or Soil Organic Matter <0.1%
Ronstar FLO 122 fl oz/A (3 lb ai/A) or 1 Ronstar on Fertilizer 3 lb ai/A
2 Specticle FLO 3 fl oz/A Apply 90 days after previous application
2 Specticle FLO 3 fl oz/A Apply 30-45 days after previous application
1A
Control through August
For Ronstar-resistant goosegrass sites Control through August
2 Specticle FLO 3 fl oz/A Apply 30-45 days after previous application
2 Specticle FLO 3 fl oz/A Apply 30-45 days after previous application
1B
2 Specticle FLO 3 fl oz/A
1 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. 2 Do not apply if turf injury is present and assess turf quality before each application.
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