How to Calibrate a Knapsack Sprayer
The first thing that should be said about the application of pesticides is that if you are paying for it to be done, the operative must have a spray licence. It is illegal for anyone to apply pesticides commercially without one.
Having said that, you may want to use pesticides yourself, and have recently purchased a portable sprayer from a garden centre and be wondering how much concentrate to use. For the purposes of this blog, we will assume you want to kill the weeds on a large gravel drive.
I should also add at this point that if you are going to use a sprayer you should be wearing protective clothing, gloves and rubber boots at all times.