"I got my first dormant spray kit today. The label suggests mixing 120ml of lime sulfur and 60ml Horticultural Oil in 3 litre of water"

Spray that mix on your trees don't dilute more use pump up sprayer not garden hose end sprayer. You don't want Lime sulfur to back up in a water supply.

Gators got it. The hose sprayers are for putting stuff on your grass only, not trees. If you have only a couple trees get a smaller handheld sprayer, for more get a 4-gal backpack. Backpack is much much easier to use, you can pump and spray at the same time.

Scott

thanks guys, that's easy enough :)