In horticultural plantations there are huge chemical losses like 15-40% or 70-80% with presently used spraying technologies. The reasons are: there are gaps between the trees, and the trees are in a different stage (tall and crown) so a big amount of chemical does not reach the target surface. This unit is improved for decreasing the chemical loss.The operating principle is the infra-red sensors identifying the presence of the plants on both sides. The unit can be fitted with 2 or sensors to detect the different heights to spray only where needed.