The aim of this paper is to introduce the original concept of spray control. Owing to environmental motivations we have developed the concept of spreadability (see for example EI Jai and Kassara 1994, 1996). In this paper we investigate the associated control theory for linear distributed systems. The spray control problem concerns the determination of controls which generate the spreadability of the system. For that purpose, we propose a first approach leading to an adaptive spray control based on regional control results and a second approach driven from linear quadratic control theory. Simulation results illustrate the second approach and show that convenient controls can transform a non-spreadable system into a spreadable one.