Lawn Spraying
When applying herbicides, it is important to apply the correct amount of herbicide per sq m. This is more important than the dilution rate. Accurate application of the required amount per sq m is important for selective weed control in lawns or around sensitive desirable plants. Too little will not be effective, and too much could damage the desirable species. It is therefore essential to –
Measure the area to be treated (sq ms)
Measure out the required amount of herbicide for the square meters to be treated.
Establish, using a trial run with water, how much water will be required to cover the area, with your particular sprayer, walking speed, and pressure.
Then mix the measured amount of herbicide with the measured required amount of water to cover the area.
Unless this accurate method is used, results could be poor from insufficient herbicide per area, or damage to the lawn from too much herbicide being applied.
Spot spraying lawns often leads to damage.
Weed killers for controlling broadleaf weeds in lawns are selective (do not harm the grass). However, this selectivity (margin of safety) is not total. If double or triple the correct rate is used, damage is likely to occur. Applying too much is less likely to occur where the total area is being sprayed – see steps above. Spot spraying is more likely to cause damage from applying too much. If spot spraying is a must – reduce the concentration by at least half. OR just do a quick wave of the spray wand over the target area. Do not hesitate or saturate to point of run off.
Remember – it is chemical per area that is important – not the dilution rate.