re: How to kill crabgrass? (Posted on 4/18/12 at 5:52 pm to cstev12)
Most chemicals that get crabgrass will injure St Aug. If its not to much pull byhand. If the crabgrass is taking over then your St Aug is weak. Fertilize at .5-1.0 pound of nitrogen per square foot every six weeks.
Also what is your mowing height? Most folk I see mowing St Aug to short. It likes 2.5-3". The St Aug should shade out the weeds and be healthier at 3" and mow more frequently like every 5 days.
Geauxtiga NC-Wilmington Fan No man's land Member since Jan 2008 24318 posts
re: How to kill crabgrass? (Posted on 4/18/12 at 10:25 pm to TutHillTiger)
I've only used it once as a pre-emerge control of stinging nettle, aka "burning grass". This was in the late fall when the grass was pretty dormant-plus it was bermuda. Have no idea if it would control dollar grass.
I spot sprayed and found decent control but have never used it for anything else.
quote: The Safe Drinking Water Act of 1974 requires that the EPA (Environmental Protection Agency) set safe drinking water standards for chemicals in drinking water. Atrazine has entered surface water and groundwater mainly through runoff from herbicides used in row crops and wastewater from manufacturing facilities. This potential for water contamination prompted the regulation of atrazine in 1992 with both the Maximum Contaminant Level Goal (MCLG) and Maximum Contaminant Level (MCL) being set at 3 parts per billion (ppb).
Despite restrictions, atrazine has contaminated groundwater. In fact, it was the second most frequently detected pesticide in the EPA’s National Pesticide in Drinking Water Wells Survey
Studies have shown atrazine to be slightly to moderately toxic to humans and animals,