Crabgrass germinates when soil temperatures average 55°F and is best controlled with the preemergence herbicides Ronstar ® or Specticle ® . (Envu)
Month February 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
Ronstar ® FLO 1 102-122 fl. oz./A (2.5-3 lb. ai./A) (if using Ronstar FLO on dormant turf, a non- selective herbicide could be included) or 2 Ronstar on Fertilizer 3 lb. ai./A Ronstar FLO 1,4 81 fl. oz./A (2 lb. ai./A) (if using Ronstar FLO on dormant turf, a non-selective herbicide could be included) or 2 Ronstar on Fertilizer 2 lb. ai./A Ronstar FLO 1 102-122 fl. oz./A (2.5-3 lb. ai./A) (if using Ronstar FLO on dormant turf, a non- selective herbicide could be included) or 2 Ronstar on Fertilizer 3 lb. ai./A Ronstar FLO 1,4 81 fl. oz./A (2 lb. ai./A) (if using Ronstar FLO on dormant turf, a non-selective herbicide could be included) or 2 Ronstar on Fertilizer 2 lb. ai./A
Specticle ® FLO 3 6 fl. oz./A or Ronstar on Fertilizer 2 lb. ai./A
Control through August
1A
Apply 90 days after previous application
For Ronstar-resistant goosegrass sites Control through August
Specticle FLO 3 9 fl. oz./A Apply at 50% Turf Green Up
1B
Sand >85% or Soil Organic Matter <0.1%
Specticle FLO 3 3 fl. oz./A
Specticle FLO 3 3 fl. oz./A Apply 30-45 days after previous application
1A
Control through August
Apply 90 days after previous application
Specticle FLO 3 3 fl. oz./A Apply at 50% Turf Green Up
Specticle FLO 3 3 fl. oz./A Apply 30-45 days after previous application
Specticle FLO 3 3 fl. oz./A Apply 30-45 days after previous application
For Ronstar-resistant goosegrass sites Control through August
1B
1 Use Ronstar FLO 2.5 lb. ai./A rate in northern part of transition zone and 3 lb. ai./A rate in southern part of transition zone. 2 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. 3 Do not apply if turf injury is present and assess turf quality before each application. 4 If winterkill is not a concern, other options include dithiopyr or prodiamine.
Goosegrass germinates 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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