Abstract: The present invention relates to a system for dispersing live biological control agents, comprising a reservoir of live biological control agents in liquid phase, a source of compressed air, a nozzle comprising a tip, the biological control agent line having a liquid phase outlet for a liquid phase jet to exit the tip in a main direction, and the compressed air line having at least one air outlet, the tip comprising a wall, the liquid phase outlet being defined by an opening in the wall of the tip, the one or more air outlets being arranged in the wall of the tip, the shape of the wall being configured to direct a flow of main air exiting the one or more air outlets in a converging manner towards the liquid phase jet.

Abstract: The invention relates to a system for the controlled spreading of predator acarians, wherein the system comprises at least one case, the case having at least one orifice suitable for predator acarians to pass through from the inside of the case to the outside of the case, the system also comprising, in each case, predator acarians, prey acarians of said predator acarians, a substrate for the prey acarians and for the predator acarians and preferentially a source of food for the prey acarians, the system being characterized in that the weight of the substrate is less than twice the total weight of the predator acarians and of the prey acarians.