NSTS is the National Sprayer Testing Scheme for the UK. The scheme has been part of UK agriculture since 2003 and a main pillar of the Voluntary Initiative. NSTS tested sprayers are a requirement of UK crop assurance scheme and supermarket protocols and NSTS satisfies the sprayer testing requirements of the Sustainable Use Directive. The NSTS was devised by the UK sprayer industry with input from farmers and grower representatives, the chemical industry, contractors as well as crop assurance and super markets. Launched initially as the AEA sprayer testing scheme it became NSTS in 2003 as an important part of the VI.